San Juan, Puerto Rico Climate by Month
San Juan, Puerto Rico
Hot all year, with rain spread through the year.
The climate in San Juan is hot all year, with rain spread through the year. Afternoon highs range from 85°F (29°C) in January to 90°F (32°C) in September, and February nights average 68°F (20°C). It gets 66 in (1668 mm) of rain a year, spread across the months.
- Warmest month
- 90°F(32°C)
- Average high, September
- Coldest nights
- 68°F(20°C)
- Average low, February
- Rain per year
- 66 in(1668 mm)
- No clear rainy season
- Humidity
- 77%
- Sunniest: July
Best and worst months in San Juan
Best for weatherFebruary and March are the best time for weather in San Juan: highs near 85°F (30°C) and about 2.8 in (71 mm) of rain a month.
Least pleasantAugust and September are the least pleasant; August is the hottest, with highs of 90°F (32°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in February.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Juan weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 85°F(29°C) | 68°F(20°C) | 4.1 in(105 mm) | 77% | 4.3 |
| FebFebruaryBest | 85°F(29°C) | 68°F(20°C) | 2.3 in(58 mm) | 74% | 4.9 |
| MarMarchBest | 85°F(30°C) | 68°F(20°C) | 3.3 in(83 mm) | 73% | 5.6 |
| AprApril | 87°F(31°C) | 70°F(21°C) | 4.8 in(123 mm) | 75% | 5.8 |
| MayMay | 88°F(31°C) | 72°F(22°C) | 7.0 in(177 mm) | 77% | 5.8 |
| JunJune | 90°F(32°C) | 74°F(23°C) | 5.1 in(130 mm) | 76% | 6.0 |
| JulJuly | 90°F(32°C) | 74°F(23°C) | 6.6 in(167 mm) | 78% | 6.1 |
| AugAugust | 90°F(32°C) | 74°F(24°C) | 7.4 in(189 mm) | 80% | 5.9 |
| SepSeptember | 90°F(32°C) | 74°F(23°C) | 6.5 in(166 mm) | 80% | 5.4 |
| OctOctober | 90°F(32°C) | 73°F(23°C) | 5.7 in(144 mm) | 79% | 5.0 |
| NovNovember | 88°F(31°C) | 72°F(22°C) | 7.4 in(188 mm) | 78% | 4.2 |
| DecDecember | 86°F(30°C) | 70°F(21°C) | 5.4 in(138 mm) | 76% | 4.0 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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