Costa Rica · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit San Jose are January, February and December, when daytime temperatures are agreeable and rainfall is relatively low.
San Jose sees its warmest weather in April, when daytime highs average around 32°C, and its coolest in November (around 29°C).
Annual precipitation totals roughly 1668mm — September is typically the wettest month (~296mm) and January the driest (~11mm).
A distinctly wetter period runs from May to November — worth planning around if you prefer dry days.
🟧 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° / 16°C | 11mm | 🌟 Great |
| February | 30° / 16°C | 14mm | 👍 Good |
| March | 31° / 16°C | 13mm | 👍 Good |
| April | 32° / 17°C | 69mm | 👍 Good |
| May | 31° / 17°C | 244mm | ⚠️ Challenging |
| June | 30° / 17°C | 221mm | ⚠️ Challenging |
| July | 30° / 17°C | 150mm | 🤔 Fair |
| August | 30° / 17°C | 201mm | 🤔 Fair |
| September | 30° / 17°C | 296mm | 🤔 Fair |
| October | 29° / 16°C | 290mm | 🤔 Fair |
| November | 29° / 16°C | 135mm | 🤔 Fair |
| December | 29° / 16°C | 25mm | 🌟 Great |
January in San Jose is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 16°C (60°F). Expect roughly 11mm of precipitation spread over about 1 rainy days, and rain is rare.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
February in San Jose is hot, with average daytime highs around 30°C (87°F) and nighttime lows near 16°C (60°F). Expect roughly 14mm of precipitation spread over about 1 rainy days, and rain is rare.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
March in San Jose is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 16°C (61°F). Expect roughly 13mm of precipitation spread over about 2 rainy days, and rain is rare.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
April in San Jose is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 17°C (62°F). Expect roughly 69mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
May in San Jose is hot, with average daytime highs around 31°C (87°F) and nighttime lows near 17°C (63°F). Expect roughly 244mm of precipitation spread over about 17 rainy days, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
June in San Jose is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 17°C (63°F). Expect roughly 221mm of precipitation spread over about 18 rainy days, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
July in San Jose is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 17°C (63°F). Expect roughly 150mm of precipitation spread over about 14 rainy days, and this is one of the wetter months.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in San Jose is warm, with average daytime highs around 30°C (86°F) and nighttime lows near 17°C (62°F). Expect roughly 201mm of precipitation spread over about 16 rainy days, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
September in San Jose is warm, with average daytime highs around 30°C (86°F) and nighttime lows near 17°C (62°F). Expect roughly 296mm of precipitation spread over about 22 rainy days, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
October in San Jose is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 16°C (61°F). Expect roughly 290mm of precipitation spread over about 19 rainy days, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
November in San Jose is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 16°C (62°F). Expect roughly 135mm of precipitation spread over about 12 rainy days, and this is one of the wetter months.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
December in San Jose is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 16°C (61°F). Expect roughly 25mm of precipitation spread over about 4 rainy days, with little rainfall.
🎒 What to pack — light summer clothing · sunscreen and sunglasses