Puerto Rico · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit San Juan are January, February and March, when daytime temperatures are agreeable and rainfall is relatively low.
San Juan sees its warmest weather in September, when daytime highs average around 32°C, and its coolest in January (around 29°C).
Annual precipitation totals roughly 1521mm — November is typically the wettest month (~187mm) and March the driest (~55mm).
A distinctly wetter period runs from April to December — 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 61 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 29° / 22°C | 103mm | 👍 Good |
| February | 29° / 22°C | 66mm | 👍 Good |
| March | 29° / 22°C | 55mm | 👍 Good |
| April | 30° / 23°C | 117mm | 🤔 Fair |
| May | 31° / 24°C | 141mm | 🤔 Fair |
| June | 32° / 25°C | 118mm | 🤔 Fair |
| July | 32° / 25°C | 153mm | 🤔 Fair |
| August | 32° / 25°C | 160mm | 🤔 Fair |
| September | 32° / 25°C | 165mm | ⚠️ Challenging |
| October | 32° / 25°C | 132mm | 🤔 Fair |
| November | 30° / 24°C | 187mm | 🤔 Fair |
| December | 29° / 23°C | 123mm | 👍 Good |
January in San Juan is warm, with average daytime highs around 29°C (83°F) and nighttime lows near 22°C (72°F). Expect roughly 103mm of precipitation spread over about 13 rainy days, with a moderate amount of rain.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
February in San Juan is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 22°C (72°F). Expect roughly 66mm of precipitation spread over about 11 rainy days, with a moderate amount of rain.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
March in San Juan is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 22°C (72°F). Expect roughly 55mm of precipitation spread over about 9 rainy days, with little rainfall.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
April in San Juan is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 23°C (74°F). Expect roughly 117mm of precipitation spread over about 11 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
May in San Juan is hot, with average daytime highs around 31°C (87°F) and nighttime lows near 24°C (76°F). Expect roughly 141mm of precipitation spread over about 12 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
June in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (77°F). Expect roughly 118mm of precipitation spread over about 11 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
July in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 153mm 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 Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 160mm of precipitation spread over about 15 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
September in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 165mm of precipitation spread over about 15 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
October in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (77°F). Expect roughly 132mm 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
November in San Juan is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 24°C (75°F). Expect roughly 187mm of precipitation spread over about 16 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
December in San Juan is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 23°C (73°F). Expect roughly 123mm of precipitation spread over about 15 rainy days, and this is one of the wetter months.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket