Weather in Ko Samui — today
Now in Ko Samui
☁️
+27°
Overcast
Feels like +30° · humidity 84%
Tue 28.7: +30° / +25°
🕐 05:25
Wind
17 km/h
UV index
0
Air (AQI)
19 · Excellent
Precipitation
99%
Humidity
84%
Pressure
1008 hPa
Sunrise / sunset
06:09 / 18:43
Sea temperature
🌊 +31°
👕 What to wear today
Warm — a T-shirt and light trousers or shorts.
☂️ Take an umbrellaFeels warmer by 3°
Weather for an activity:
Detailed weather information for Ko Samui
Tuesday, 28 July, in Ko Samui (Thailand): cloudy, light rain in places, hot. During the day the air will warm up to +30°, at night around +25°. Wind up to 19 km/h. High chance of rain — be sure to take an umbrella or a raincoat. Light summer clothing will do — a T-shirt and shorts or light trousers. The sea has warmed up to +31° — great for swimming. The sun will rise at 06:09 and set at 18:43 — daylight lasts 13 hours.Hourly weather in Ko Samui
💧 The bars at the bottom show the hourly precipitation probability. Shaded areas of the chart are the dark hours (before sunrise 🌅 and after sunset 🌇).
Weather in Ko Samui for 14 days
Tap a day to expand it by time of day and open the full forecast. The bar shows the range from the night low (left) to the day high (right).
▶
Tue 28.7
🌦️
💧 99%
+25° +30°
Morning
🌦️
+27°
Day
🌦️
+30°
Evening
🌇
+29°
Night
🌙
+25°
▶
Today 29.7
🌦️
💧 98%
+25° +28°
Morning
🌦️
+26°
Day
🌦️
+28°
Evening
🌇
+25°
Night
🌙
+25°
▶
Tomorrow 30.7
⛈️
💧 90%
+25° +26°
Morning
🌦️
+25°
Day
⛈️
+26°
Evening
🌇
+25°
Night
🌙
+25°
▶
Fri 31.7
⛈️
💧 82%
+25° +28°
Morning
⛈️
+26°
Day
⛈️
+28°
Evening
🌇
+27°
Night
🌙
+25°
▶
Sat 1.8
🌦️
💧 76%
+26° +30°
Morning
🌦️
+27°
Day
🌦️
+30°
Evening
🌇
+29°
Night
🌙
+26°
▶
Sun 2.8
⛈️
💧 92%
+26° +30°
Morning
⛈️
+27°
Day
⛈️
+30°
Evening
🌇
+29°
Night
🌙
+26°
▶
Mon 3.8
🌦️
💧 82%
+26° +30°
Morning
🌦️
+27°
Day
🌦️
+30°
Evening
🌇
+29°
Night
🌙
+26°
▶
Tue 4.8
🌦️
💧 69%
+26° +29°
Morning
🌦️
+27°
Day
🌦️
+29°
Evening
🌇
+28°
Night
🌙
+26°
▶
Wed 5.8
🌦️
💧 76%
+26° +29°
Morning
🌦️
+27°
Day
🌦️
+29°
Evening
🌇
+28°
Night
🌙
+26°
▶
Thu 6.8
🌦️
💧 73%
+26° +30°
Morning
🌦️
+27°
Day
🌦️
+30°
Evening
🌇
+29°
Night
🌙
+26°
▶
Fri 7.8
🌦️
💧 63%
+26° +29°
Morning
🌦️
+27°
Day
🌦️
+29°
Evening
🌇
+28°
Night
🌙
+26°
▶
Sat 8.8
🌦️
💧 71%
+26° +30°
Morning
🌦️
+27°
Day
🌦️
+30°
Evening
🌇
+29°
Night
🌙
+26°
▶
Sun 9.8
🌦️
💧 67%
+27° +29°
Morning
🌦️
+28°
Day
🌦️
+29°
Evening
🌇
+29°
Night
🌙
+27°
▶
Mon 10.8
🌦️
💧 59%
+27° +29°
Morning
🌦️
+28°
Day
🌦️
+29°
Evening
🌇
+29°
Night
🌙
+27°
🗺️ Precipitation radar
Precipitation radar (RainViewer) over a clean base map — updates every 5–10 minutes. Colours show nearby precipitation; if there is none, the map is simply clear — that is normal. Zoom with + / −.
Rain intensity:lightmoderateheavy
🎯 What to do in this weather — indices of the day
Comfort score from 0 (bad) to 100 (excellent), calculated from the day's weather. For “rain” and “UV” a percentage/risk level is shown.
🏖️ Beach
16 / 100
for sea and sun · Bad
🏊 Swimming
0 / 100
water 31° · Bad
🏃 Running
0 / 100
comfort for running · Bad
🧴 UV
0%
moderate · low
☂️ Rain
99%
likely · high
✨ Stars
19 / 100
evening visibility · Bad
🧺 Laundry drying
0 / 100
will dry outside · Bad
🚗 Car wash
0 / 100
better to wait · Bad
🌫️ Air quality
19
Excellent air
European AQI
PM2.5: 3PM10: 5O₃: 47NO₂: 2
The air is clean — you can walk and exercise outside.
🌅 Sun, moon and sea
Sunrise
06:09
Sunset
18:43
Golden hour
18:14
Daylight
13 h (+0 min vs yesterday)
Sea temperature
+31°
🌊 calm, waves 0.3 m.
Ko Samui climate by month
Long-term averages. Hover over a bar for details. The forecast for a specific month is a combination of the climate normal and the model forecast for the coming weeks.
+28°
+25°
Jan
+28°
+26°
Feb
+29°
+27°
Mar
+30°
+27°
Apr
+30°
+27°
May
+30°
+27°
Jun
+30°
+27°
Jul
+29°
+27°
Aug
+29°
+26°
Sep
+28°
+26°
Oct
+28°
+26°
Nov
+28°
+26°
Dec
swipe sideways →
Bar color shows temperature:frostcoolcomfortablewarmhot— best months to visit
| Month | Day | Night | Sea | Precipitation | What to pack and what makes the month notable (events, nuances) |
|---|---|---|---|---|---|
| January | +28° | +25° | +28° | 78 mm | Gentle warmth — about +28° daytime, great walking weather. Frequent rain (78 mm over the month) — keep indoor backup plans. 😊 light summer clothing. Water at +28° — great for swimming. This is the coldest month of the year. |
| February | +28° | +26° | +29° | 35 mm | A comfortable month: +28° by day without exhausting heat. 😊 light summer clothing. Water at +29° — great for swimming. Weather-wise, one of the three best months to visit. |
| March | +29° | +27° | +30° | 87 mm | Warm and comfortable: +29° by day, +27° at night. It's a rainy month (87 mm) — an umbrella is a must. 😊 light summer clothing. The sea is +30° — like a warm bath. Weather-wise, one of the three best months to visit. |
| April | +30° | +27° | +32° | 96 mm | Gentle warmth — about +30° daytime, great walking weather. Frequent rain (96 mm over the month) — keep indoor backup plans. 😊 light summer clothing. The sea is +32° — like a warm bath. |
| May | +30° | +27° | +32° | 119 mm | A comfortable month: +30° by day without exhausting heat. One of the wettest months (119 mm): downpours can derail plans. 😊 light summer clothing. The sea is +32° — like a warm bath. This is the hottest month of the year in Ko Samui. |
| June | +30° | +27° | +31° | 93 mm | Warm and comfortable: +30° by day, +27° at night. It's a rainy month (93 mm) — an umbrella is a must. 😊 light summer clothing. The sea is +31° — like a warm bath. The longest daylight hours of the year — more time for everything. |
| July | +30° | +27° | +31° | 88 mm | Gentle warmth — about +30° daytime, great walking weather. Frequent rain (88 mm over the month) — keep indoor backup plans. 😊 light summer clothing. The sea is +31° — like a warm bath. |
| August | +29° | +27° | +31° | 96 mm | A comfortable month: +29° by day without exhausting heat. One of the wettest months (96 mm): downpours can derail plans. 😊 light summer clothing. The sea is +31° — like a warm bath. |
| September | +29° | +26° | +30° | 143 mm | Warm and comfortable: +29° by day, +26° at night. It's a rainy month (143 mm) — an umbrella is a must. 😊 light summer clothing. The sea is +30° — like a warm bath. |
| October | +28° | +26° | +30° | 283 mm | Gentle warmth — about +28° daytime, great walking weather. Frequent rain (283 mm over the month) — keep indoor backup plans. 😊 light summer clothing. The sea is +30° — like a warm bath. Statistically the wettest month of the year. |
| November | +28° | +26° | +29° | 281 mm | A comfortable month: +28° by day without exhausting heat. One of the wettest months (281 mm): downpours can derail plans. 😊 light summer clothing. Water at +29° — great for swimming. |
| December | +28° | +26° | +29° | 144 mm | Warm and comfortable: +28° by day, +26° at night. It's a rainy month (144 mm) — an umbrella is a must. 😊 light summer clothing. Water at +29° — great for swimming. The shortest daylight of the year — it gets dark early. |
When to visit Ko Samui
✅ Recommended time to visit
🌟 Best time: January, February, March
Daytime air+28…+29°
Sea temperature+28…+30°
Precipitationoften
Why: comfortable +28…+29° by day, little rain, warm sea (+28…30°).
⚠️ Doable, with caveats
🌤️ Shoulder season: April, May, June, July, August, December
Daytime air+28…+30°
Sea temperature+29…+32°
Precipitationoften
Why: noticeable rain risk (88–144 mm/month) — pack an umbrella and backup plans.
🔴 Not the best time
🌤️ Shoulder season: September, October, November
Daytime air+28…+29°
Sea temperature+29…+30°
Precipitationoften
Why: the rainy season (143–283 mm/month) — downpours almost daily.
Bottom line: the best time to visit Ko Samui is January – March, and the most comfortable months are January, February, March. The toughest months to visit are September, October, November: frequent rain.
🌡️ Today vs the climate normal
Today's high
+30°
Normal for July
+30°
Deviation
0° within normal
A year ago on this day
+34°
Record for this date
+34° (2025)
The normal, “a year ago” and the record come from the weather archive since 1940 (Open-Meteo / ERA5).
Weather archive for Ko Samui
📅 See what the weather was like on any day since 1940. For example: “what was the weather on March 2, 2021”.
Show the archive for the selected day →
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Weather in cities near Ko Samui
Frequently asked questions about the weather in Ko Samui
What is the weather in Ko Samui right now?＋
Overcast, +27°, feels like +30°.
Will it rain in Ko Samui today?＋
Yes: 99% chance, 7 mm.
When is the best time to visit Ko Samui?＋
Best time to visit — January – March.
Can you swim in Ko Samui in winter?＋
In winter the water is around +29° — great for swimming. In summer the sea warms up to +31°.
What time are sunrise and sunset in Ko Samui?＋
Sunrise 06:09, sunset 18:43.
Does it snow in Ko Samui in winter?＋
No, it practically never snows.
What is the climate in Ko Samui by month?＋
Summers up to +30° in May, winters around +25° in January; the wettest month is October.
How hot is it in Ko Samui in summer?＋
😊 Warm and comfortable. Perfect for walks, the beach and sightseeing.
Data: Open-Meteo (CC-BY 4.0), met.no, NWS · radar RainViewer · archive since 1940 · © wweather1 · TrafficAdv LLC