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Weather in Koh Yao Noi: the climate month by month

When to go to Koh Yao Noi, how hot it gets and when the rain comes: every month in detail, from the official climate averages of the Thai Meteorological Department, with my own advice on top.

Kylian DevBy Kylian Dev

  • Official 1991–2020 averages
  • 12 months in detail
  • Best time: December to March

In short

The best time to visit Koh Yao Noi is December to March, the driest period of the year. The rainy season runs from May to October, and the wettest month is September, with 350 mm of rain over about 19 days. Daytime highs range from 31.8°C in September to 34.4°C in March, and nights never drop below about 24.9°C on average.

At a glance

Rain and temperatures in Koh Yao Noi, month by month

Bars show average rainfall; figures above them are the average daytime high and night-time low.

Dry (under 100 mm)Some rain (100 to 200 mm)Rainy (over 200 mm)°/° °C · mm

Month by month

Climate table for Koh Yao Noi

Click a month to see what else happens in Thailand that month: festivals, crowds and the best regions.

MonthHighLowRainRainy daysHumidityVerdict
January33 °C25 °C50 mm476 %Dry
February34 °C25.4 °C24 mm274 %Dry
March34.4 °C25.9 °C81 mm676 %Dry
April34.2 °C26.3 °C135 mm1079 %Some rain
May33.2 °C26.1 °C237 mm1681 %Rainy
June32.6 °C25.8 °C249 mm1682 %Rainy
July32.3 °C25.6 °C240 mm1682 %Rainy
August32.2 °C25.6 °C309 mm1782 %Rainy
September31.8 °C25.1 °C350 mm1984 %Rainy
October31.8 °C24.9 °C336 mm1985 %Rainy
November32.1 °C25.2 °C178 mm1383 %Some rain
December32.1 °C25 °C82 mm879 %Dry

Total rainfall over the year: 2,271 mm.

Month by month

Koh Yao Noi in each month of the year

Koh Yao Noi in January

Dry

Average highs of 33°C and lows of 25°C, with 50 mm of rain over about 4 days. A dry month: one of the best times to go.

Koh Yao Noi in February

Dry

Average highs of 34°C and lows of 25.4°C, with 24 mm of rain over about 2 days. A dry month: one of the best times to go.

Koh Yao Noi in March

Dry

Average highs of 34.4°C and lows of 25.9°C, with 81 mm of rain over about 6 days. A dry month: one of the best times to go.

Koh Yao Noi in April

Some rain

Average highs of 34.2°C and lows of 26.3°C, with 135 mm of rain over about 10 days. Some showers, usually short: still a good month to go.

Koh Yao Noi in May

Rainy

Average highs of 33.2°C and lows of 26.1°C, with 237 mm of rain over about 16 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in June

Rainy

Average highs of 32.6°C and lows of 25.8°C, with 249 mm of rain over about 16 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in July

Rainy

Average highs of 32.3°C and lows of 25.6°C, with 240 mm of rain over about 16 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in August

Rainy

Average highs of 32.2°C and lows of 25.6°C, with 309 mm of rain over about 17 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in September

Rainy

Average highs of 31.8°C and lows of 25.1°C, with 350 mm of rain over about 19 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in October

Rainy

Average highs of 31.8°C and lows of 24.9°C, with 336 mm of rain over about 19 days. A rainy month: expect a shower most days and keep plans flexible.

Koh Yao Noi in November

Some rain

Average highs of 32.1°C and lows of 25.2°C, with 178 mm of rain over about 13 days. Some showers, usually short: still a good month to go.

Koh Yao Noi in December

Dry

Average highs of 32.1°C and lows of 25°C, with 82 mm of rain over about 8 days. A dry month: one of the best times to go.

Seasons

The three things to know about the weather in Koh Yao Noi

Best time

December to March. Least rain of the year, calmer sea on the coast and lots of sunshine. It is also the high season: book early.

Rainy season

May to October. Rain usually comes as heavy showers, often in the afternoon or at night, rather than all day. Peak in September (350 mm).

Hottest month

March, with average highs of 34.4°C and high humidity. Plan outdoor visits early in the morning.

My advice

What the numbers don't say about Koh Yao Noi

Koh Yao Noi has no station; its climate is that of Phuket, across the bay, shown here. December to March brings flat, clear water for kayaking among the islets. From May to October showers are frequent, but Phang Nga Bay is sheltered, so boat trips run more often than on the open Andaman coast.

Where these figures come from

Monthly averages over 1991–2020 from the Phuket weather station of the Thai Meteorological Department, as published in the World Meteorological Organization climate normals. They describe a typical year, not a forecast: a given year can be wetter or drier.

There is no official weather station in Koh Yao Noi itself, so these are the figures of the nearest station, Phuket. Local conditions can differ slightly.

Data table (Wikipedia, WMO/TMD normals)
Everything about Koh Yao NoiThings to do, food, getting there and budget.Thailand month by monthCompare every region for the month you travel.Travelling in the rainy seasonWhere it rains less and how to plan around it.

FAQ

Weather in Koh Yao Noi: your questions

When is the best time to visit Koh Yao Noi?

December to March is the best time: it is the driest period of the year in Koh Yao Noi, with the most sunshine. It is also the busiest and most expensive season, so book early.

Where to stay in Koh Yao Noi
When is the rainy season in Koh Yao Noi?

The rainy season runs from May to October. The wettest month is September, with about 350 mm of rain over 19 days on average. Showers are heavy but often short: add a light rain jacket to your Thailand packing list.

What is the hottest month in Koh Yao Noi?

March is the hottest month, with average highs of 34.4°C. The most pleasant month for temperatures is September, with highs of 31.8°C.

Is it worth going to Koh Yao Noi in the rainy season?

Yes, if you stay flexible. Prices drop, there are fewer tourists and the scenery is green. Expect a shower most days, allow spare days for boat trips and get travel insurance that covers cancellations.

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