Thailand · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Chiang Rai are January, February and December, when daytime temperatures are agreeable and rainfall is relatively low.
Chiang Rai sees its warmest weather in April, when daytime highs average around 35°C, and its coolest in December (around 28°C).
Annual precipitation totals roughly 1723mm — August is typically the wettest month (~373mm) and February the driest (~13mm).
A distinctly wetter period runs from May to October — worth planning around if you prefer dry days.
January is the sunniest month, with about 249 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 60 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 29° / 14°C | 17mm | 🌟 Great |
| February | 31° / 15°C | 13mm | 👍 Good |
| March | 34° / 18°C | 35mm | 👍 Good |
| April | 35° / 21°C | 93mm | 🤔 Fair |
| May | 34° / 23°C | 227mm | ⚠️ Challenging |
| June | 33° / 24°C | 186mm | ⚠️ Challenging |
| July | 31° / 24°C | 318mm | ⚠️ Challenging |
| August | 31° / 24°C | 373mm | ⚠️ Challenging |
| September | 31° / 23°C | 275mm | ⚠️ Challenging |
| October | 31° / 22°C | 124mm | 🤔 Fair |
| November | 30° / 18°C | 45mm | 👍 Good |
| December | 28° / 15°C | 21mm | 🌟 Great |
January in Chiang Rai is warm, with average daytime highs around 29°C (83°F) and nighttime lows near 14°C (57°F). Expect roughly 17mm of precipitation spread over about 2 rainy days, and rain is rare.
☀️ About 249 hours of sunshine over the month (~8h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
February in Chiang Rai is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 15°C (58°F). Expect roughly 13mm of precipitation spread over about 1 rainy days, and rain is rare.
☀️ About 243 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
March in Chiang Rai is hot, with average daytime highs around 34°C (93°F) and nighttime lows near 18°C (64°F). Expect roughly 35mm of precipitation spread over about 3 rainy days, with little rainfall.
☀️ About 244 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
April in Chiang Rai is hot, with average daytime highs around 35°C (94°F) and nighttime lows near 21°C (70°F). Expect roughly 93mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 246 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
May in Chiang Rai is hot, with average daytime highs around 34°C (92°F) and nighttime lows near 23°C (73°F). Expect roughly 227mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 216 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
June in Chiang Rai is hot, with average daytime highs around 33°C (91°F) and nighttime lows near 24°C (75°F). Expect roughly 186mm of precipitation spread over about 15 rainy days, and this is one of the wetter months.
☀️ About 159 hours of sunshine over the month (~5h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
July in Chiang Rai is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 24°C (75°F). Expect roughly 318mm of precipitation spread over about 20 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 123 hours of sunshine over the month (~4h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Chiang Rai is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 24°C (75°F). Expect roughly 373mm of precipitation spread over about 21 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 126 hours of sunshine over the month (~4h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Chiang Rai is hot, with average daytime highs around 31°C (89°F) and nighttime lows near 23°C (74°F). Expect roughly 275mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 163 hours of sunshine over the month (~5h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
October in Chiang Rai is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 22°C (71°F). Expect roughly 124mm of precipitation spread over about 8 rainy days, and this is one of the wetter months.
☀️ About 198 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
November in Chiang Rai is warm, with average daytime highs around 30°C (85°F) and nighttime lows near 18°C (64°F). Expect roughly 45mm of precipitation spread over about 4 rainy days, with little rainfall.
☀️ About 224 hours of sunshine over the month (~7h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
December in Chiang Rai is warm, with average daytime highs around 28°C (82°F) and nighttime lows near 15°C (58°F). Expect roughly 21mm of precipitation spread over about 2 rainy days, with little rainfall.
☀️ About 222 hours of sunshine over the month (~7h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses