Laos · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Vientiane are January, November and December, when daytime temperatures are agreeable and rainfall is relatively low.
Vientiane sees its warmest weather in April, when daytime highs average around 35°C, and its coolest in December (around 29°C).
Annual precipitation totals roughly 1663mm — August is typically the wettest month (~341mm) and December the driest (~5mm).
A distinctly wetter period runs from May to September — worth planning around if you prefer dry days.
November is the sunniest month, with about 225 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° / 18°C | 7mm | 🌟 Great |
| February | 31° / 19°C | 17mm | 👍 Good |
| March | 33° / 22°C | 44mm | 🤔 Fair |
| April | 35° / 24°C | 89mm | 🤔 Fair |
| May | 34° / 25°C | 226mm | ⚠️ Challenging |
| June | 33° / 25°C | 264mm | ⚠️ Challenging |
| July | 32° / 25°C | 300mm | ⚠️ Challenging |
| August | 31° / 25°C | 341mm | ⚠️ Challenging |
| September | 32° / 25°C | 265mm | ⚠️ Challenging |
| October | 32° / 24°C | 87mm | 🤔 Fair |
| November | 31° / 22°C | 18mm | 👍 Good |
| December | 29° / 19°C | 5mm | 🌟 Great |
January in Vientiane is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 18°C (65°F). Expect roughly 7mm of precipitation spread over about 2 rainy days, and rain is rare.
☀️ About 221 hours of sunshine over the month (~7h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
February in Vientiane is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 19°C (67°F). Expect roughly 17mm of precipitation spread over about 2 rainy days, and rain is rare.
☀️ About 215 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
March in Vientiane is hot, with average daytime highs around 33°C (92°F) and nighttime lows near 22°C (71°F). Expect roughly 44mm of precipitation spread over about 5 rainy days, with little rainfall.
☀️ About 209 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
April in Vientiane is hot, with average daytime highs around 35°C (95°F) and nighttime lows near 24°C (76°F). Expect roughly 89mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
☀️ About 214 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
May in Vientiane is hot, with average daytime highs around 34°C (92°F) and nighttime lows near 25°C (77°F). Expect roughly 226mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 189 hours of sunshine over the month (~6h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
June in Vientiane is hot, with average daytime highs around 33°C (91°F) and nighttime lows near 25°C (78°F). Expect roughly 264mm of precipitation spread over about 18 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 141 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 Vientiane is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 300mm of precipitation spread over about 20 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 116 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 Vientiane is hot, with average daytime highs around 31°C (89°F) and nighttime lows near 25°C (77°F). Expect roughly 341mm of precipitation spread over about 21 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 124 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 Vientiane is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (76°F). Expect roughly 265mm of precipitation spread over about 17 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 158 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 Vientiane is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 24°C (75°F). Expect roughly 87mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 210 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
November in Vientiane is hot, with average daytime highs around 31°C (87°F) and nighttime lows near 22°C (71°F). Expect roughly 18mm of precipitation spread over about 2 rainy days, and rain is rare.
☀️ About 225 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
December in Vientiane is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 19°C (67°F). Expect roughly 5mm of precipitation spread over about 1 rainy days, and rain is rare.
☀️ About 225 hours of sunshine over the month (~7h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses