When is the Best Time to Visit Koh Samui? Koh Samui Weather, Rain, Timing Tips and Advice
When is the Best Time to Visit Koh Samui? Discover exactly what you need to know about Koh Samui’s weather, rain & climate. Discover when is the best time to visit Koh Samui + how to rain-proof your trip. | #kohsamui #thailand #samui #travel

So you want me to take away the guesswork and tell you when is the best time to visit Koh Samui? That’s a little like asking someone to choose a favourite child: every month has something to recommend it.

Here’s exactly what you need to know about Koh Samui’s weather, rain, clouds and climate– easily find out when is the best time for you to visit Koh Samui, using averages, anecdote … and at least two Jurassic Park references.

The best time to visit Koh Samui

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Let me guess: your beach holiday requires Koh Samui’s best time of year: the most sunshine, least cloud cover and fewest possible drops of rain? No problem. And did you want pretty pictures instead of tedious charts? Done.

For your anecdotal reference, I’ve tried-and-tested every month of Koh Samui’s climate over the past 15 years. For statistical precision, I’ve spent quality time with 8 years of Koh Samui weather averages and a spreadsheet. As such, I can hereby suggest when is best (weather-wise) to visit Koh Samui.

Koh Samui’s climate is different than Phuket and other parts of Thailand.

Koh Samui weather by month

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Koh Samui weather averages

My best advice about Koh Samui’s weather

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

1. Official party line: My official party line is that there’s always a nice day to be had on Koh Samui; there’s tons to do on rainy days.

2. Ignore the whingers: Every travel forum has a Barry-from-Blackpool who was dealt some bad luck when he vacationed at a time of year guaranteed to be sunny. January 2017 dealt some particularly memorable weather tricks. Sorry to say that’s just the nature of long-haul destinations in the tropics. You commit to dates far in advance and this lush corner of the world can offer some dramatic ‘meteorological experiences’. But guess what? From a covered balcony, or room with a view, tropical storms are amazing.

3. Do this not that: Instead of allowing yourself to get weather-obsessed, I recommend you book your Koh Samui vacation when it’s most convenient – when you most need days of perfect relaxation. Rest assured if it does decide to pour – any day of the year – there’s still plenty to do (rain or shine The Koh Samui Guide will easily keep you busy).

4. Sun-tanners – skip November: If you’re seeking assurance you’ll get a gorgeous, sunny Thai holiday and return home with a tan, then just about any month besides November will do its very best. November, Koh Samui’s wettest month, sees an average of 489.66 mm/10 inches of rainfall.

If you burn easily, avoid the sun, or don’t like to tan, you might love visiting Koh Samui in November. For one thing, we get the island absolutely to ourselves and hotel rates are cheapy-cheap.

Rain or shine, The Koh Samui Guide will keep you busy (and happy!) Get your Koh Samui Guide

When is Koh Samui’s rainy/monsoon season?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Usually October through December – here’s absolutely everything you need to know about Koh Samui’s rainy season. Again, note that this is different from Phuket and other parts of Thailand.

When is the sunniest time of year on Koh Samui?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Defined by the fewest rainy days and the least median cloud cover, February and March are – statistically – the sunniest months. While superlatives are handy references, it’s a hair-splitting difference between “sunniest” and most of the rest of the year. Rather than four seasons, Koh Samui has two: lots of gorgeous weather, and a much shorter rainy season.

Gauging the sunniest time on Koh Samui is more a choose-your-own story of plotting your favourite temperature against the potential for raindrops and cloud cover. If we take ‘sunniest’ to mean ‘least median cloud cover’, then it’s February/March on Koh Samui (and the cloudiest time is September/October). But – as with weather everywhere – averages aren’t guarantees.

Does March’s most-sunny designation make it the best time to visit Koh Samui? Not at all. I’m not certain what counts for ‘cloud cover’ in meteorological terms, and whether or not it would include any pretty wispy whites. Compare a few picture-postcard beach days at other times of the year. In all probability, they’re designated “partly cloudy”. Fine by me, how about you?

When is the driest time of year on Koh Samui?

Typically February is your best bet, with just 12% of the average rain seen in November. In second and third place for those of you avoiding puddles: March and April tend to be nice and dry, too (that is – unless you’re visiting during Songkran. The weather might be dry but you won’t be).

When is the hottest time of year on Koh Samui?

April (usually right around Songkran).

When is the coolest time of year on Koh Samui?

January (statistically right after the New Year’s Eve bustle).

Koh Samui weather

What’s the weather like on Koh Samui?

For the most part, Koh Samui weather is hot and sunny – just what you want for a perfect beach holiday. There are two stark exceptions, as well as shoulder seasons, freak acts from the weather gods and, often, a delightfully cooling afternoon downpour. (Hey, it’s the tropics!) Here are my best answers to the question: “I’m coming to Koh Samui in [month]. What will the weather be like?”

First up, two stark exceptions to the “hot and sunny rule”

1. Rainy season: Koh Samui’s rainy season, which is typically late October to mid-December.

Average November rainfall on Koh Samui is 1.6 feet of rain. Yes, FEET. When it rains, it pours.

2. When it’s *really* hot and sunny: That would be Koh Samui in April (with Songkran – the water festival – right in the middle).

Learn what to wear in Thailand to stay cool (and un-burnt).

Koh Samui weather, month by month

I both caution and cover my rear with this caveat: there’s no guarantee and this is a crazy world.

January

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

One of the cooler months of the year on Koh Samui, with lows dipping to a ‘frigid’ 24.1°C (75°F). Coming from the tail-end of rainy season, the temperature heats up through the month. If you don’t like strong heat, a New Year trip to Koh Samui would suit you well.

  • Koh Samui weather early January: see December
  • Koh Samui weather end of January: see February

February

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Hey, guess what, it’s hot and sunny. An average 1 degree Celsius hotter than January, with the lightest rainfall of any month.

  • Koh Samui weather early February: see January
  • Koh Samui weather end of February: see March

March

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Hot and getting hotter. By averages, March also has the fewest number of rainy days and, correspondingly, the least median cloud cover.

  • Koh Samui weather early March: see February
  • Koh Samui weather end of March: see April

April

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

REALLY HOT. April’s a scorcher.

  • Koh Samui weather early April: see March
  • Koh Samui weather end of April: see May

May

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

For that matter, May is pretty hot too (with more rainfall than March or April. When it’s this hot, the rain cuts the humidity and cools everything down – storms are gratefully received).

  • Koh Samui weather early May: see April
  • Koh Samui weather end of May: see June

As rainfall increases and humidity rises, you’ll definitely want to up your mosquito warfare techniques: this is my absolute favourite repellent (it’s totally natural).

June

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

June is a beautiful month on Koh Samui. If you schedule your trip before school holidays begin, you’ll usually find a very quiet island – certainly far fewer families than in July and August.

  • Koh Samui weather early June: see May
  • Koh Samui weather end of June: see July

July

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

July and August are popular months on Koh Samui and for good reason. The differences in temperature and average number of rainy days between these two months are hair-splitting. Whether enjoying a northern hemisphere summer holiday or escaping southern hemisphere winter, it’s a great time of year to visit Koh Samui.

  • Koh Samui weather early July: see June
  • Koh Samui weather end of July: see August

August

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

  • Koh Samui weather early August: see July
  • Koh Samui weather end of August: see September
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September

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Just as nice as August but likely a lot quieter on the island. As of September 1st (when families head back for school), Koh Samui is all yours. As September draws on, expect it get cloudier.

  • Koh Samui weather early September: see August
  • Koh Samui weather end of September: see October

October

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Starts out gorgeous (nicely hot and sunny). October on Koh Samui is, on average, one of the cloudiest months and it can be quite windy, too. Towards the end of October, rainy season might arrive.

  • Koh Samui weather early October: see September
  • Koh Samui weather end of October: see November

November

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Typically rainy season. Though it’s as soggy as a sponge, I think November on Koh Samui has a lot to recommend it.

  • Koh Samui weather early November: see October
  • Koh Samui weather end of November: see December

December

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

The tail-end of rainy season, not-quite-as-hot, but hopefully sunny. Just about perfect for a Santa hat and a Koh Samui Christmas.

  • Koh Samui weather early December: see November
  • Koh Samui weather end of December: see January

Koh Samui weather at Christmas

With at least six or seven Koh Samui Christmases under my belt, I admit that your chances of sunshine aren’t guaranteed. But your chances of finding home-made, freshly baked, Koh Samui mince pies? 100%. Find out everything you need to know about Koh Samui at Christmas, and you might never look back.

Should I go to Koh Samui in December? If your alternative is being cold in a grey and miserable winter? Um, yes.

So when is the best time on Koh Samui?

Call me biased, but with fresh Samui coconuts on offer every day of the year… can there really be a bad time to come? Use The Koh Samui Guide to answer all your ‘what ifs’, ‘how to’s’ and ‘where shoulds’, then start planning the many ways you’ll enjoy the sun and rain of any season.

Use The Koh Samui Guide to answer all your ‘what ifs’, ‘how tos’ and ‘where shoulds’ Get your Koh Samui Guide

Koh Samui rain

Rain-proof your Koh Samui holiday

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

When booking your accommodation (see where to stay on Koh Samui), look for outside areas that have covered overhangs (whether a balcony, patio or a restaurant or beach bar elsewhere within the resort).

1. Rain with an ocean view: Every room at Hansar Samui has an enormous ocean-view balcony (more like an outdoor living room). Unless the rain is coming in sideways, you’ll be able to enjoy any storms outside. Worst case? It’s exactly a 30-second walk to some of Koh Samui’s best bars and restaurants in Fisherman’s Village.

2. Rain with fresh croissants: Next door, Anantara Bophut also offers large, covered balconies and these are a great spot in a rain-storm. Easily turn yours into a rainy day picnic party: grab an Anantara golf umbrella, then order fresh croissants from room service. (Anantara’s bakery is amongst the best on the island). I’m telling you, rain is a good thing.

3. Rain with beer + beach book: Beach-front restaurants, like those at Escape Beach Resort and Bandara Resort & Spa, have see-through rain screens that roll down to keep you beach-front in any weather.

Samui rainy days never mean cold weather, and you can often enjoy the dramatic atmosphere outside with your beer and a great book (while staying completely dry).

How to come prepared for rain?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

I don’t suggest packing wellies but, if rain is a concern, take a few tips from what to wear in rainy season. Three useful things to pack in case you’re caught in an unexpected storm:

Occasionally, strong storms can lead to temporary power outs so keep your Kindle charged and consider packing a wind-up, pocket-sized flashlight/torch.

Does it rain often on Koh Samui? How long does it rain?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Koh Samui’s rainfall totally depends on the time of year. There’s rainy season, which can offer an astonishing volume of rainfall over a period of weeks. There’s a dry, extra-hot season. There are months where it rains a little every day – consistent but short-and-sweet rain showers. If nothing but sunshine is important, learn which are Koh Samui’s sunniest months (above).

Does it rain all day in [month]?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

To help choose when is best for you, see Koh Samui’s month-by-month climate details, above. If you’re not aware of what you’ve signed up for, chances are you won’t find rainy season any kind of fun – as it can rain for days and weeks without ceasing. Otherwise, say in August, the world might end in wet fury for just 20 minutes.

What’s the rain like on Koh Samui?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

You know how Jurassic Park was super lush and green? And then it rained rather memorably?

Same in Thailand: tropical country, requires regular watering. If you’ve never enjoyed hot, tropical rain – it’s pretty fantastic actually!

When the skies properly let loose, Koh Samui’s rain is easily described with a Forrest Gump quote. In rainy season especially, you might experience “every kind of rain there is. Little bitty stingin’ rain… and big ol’ fat rain.” If you’re coming from, say, Seattle or London where rain is a constant, often miserable, drizzle – Koh Samui rain might win you over. Yes, it cuts into tanning time, but it’s such a dramatic show you might not care. Take cover in a charming beach restaurant, a palm-thatched sala or an outdoor living room and enjoy the show. Tropical plants become greener than possible, and you can easily conjure some Robinson Crusoe elemental adventure.

Whatever the weather, The Koh Samui Guide is your trusty side-kick and will help make sure you have a fantastic vacation.

Have realistic expectations

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

How to actually enjoy a Koh Samui rainy day? (Yes, really!) Rather than having your holiday ruined by an afternoon or few days of rain – try this little trick: Assume it will rain for at least part of your trip. That way, you’ll already have rainy-day activities that you’re looking forward to (and there are many).

How to avoid Koh Samui rain?

When is the Best Time to Visit Koh Samui? Koh Samui Weather Advice

Koh Samui is a very hilly island (you’d generously call it mountainous) and has very localised microclimates. As such, visitors staying at one beach might experience a week of perfect sun, while those a few bays over see frequent thunderstorms. Outside of rainy season and days of determined ‘wet weather systems’ there’s every chance you could simply rent a car and drive elsewhere to find blue sky.

So, when are you coming?

Koh Samui will easily provide the beach holiday you’re dreaming of and, with a little preparation and sense of adventure, you can enjoy its soggy sideshow in equal measure. Find more ‘glass half full’ honesty and insight in The Koh Samui Guide. In it, you’ll get more activity ideas and logistical tips for every kind of a weather (plus find out what not to do when it rains). Enjoy!

Whatever the weather, The Koh Samui Guide is your trusty side-kick Get your Koh Samui Guide

Sources: World Weather OnlineWeatherbase, Holiday-Weather.com and WeatherSpark.