San Juan, Puerto Rico Weather
San Juan hourly forecast: next 24 hours
Today's high of 88°F (31°C) is right in line with the typical August high of 88°F (31°C).
Current conditions in detail
San Juan weather tomorrow (Friday, August 7)
Tomorrow in San Juan looks patchy rain nearby, with a high of 87° and an overnight low of 77°. Precipitation chance is modest at 21%. Winds top out near 17 mph, and the UV index reaches 12 (extreme).
San Juan 14-day forecast
About the weather in San Juan
Located in Puerto Rico, San Juan experiences a tropical wet-and-dry climate with year-round warmth split between a rainy season and a pronounced dry season. Afternoon temperatures peak near 88°F (31°C) in July and dip to about 83°F (28°C) in January, with around 40.7 inches (1035 mm) of precipitation falling across the year.
San Juan weather: quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 83°F (28°C)
- Record high: 97°F (36°C) · Record low: 65°F (18°C) (2015–2024)
- Wettest month: September (22 rainy days) · Sunniest: June (12.2 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 88°F (31°C) and overnight lows stay near 77°F (25°C). The coolest month is January, with typical highs of 83°F (28°C) and lows around 71°F (22°C). Based on 2015–2024 weather data, temperatures have reached as high as 97°F (36°C) and dropped as low as 65°F (18°C).
Rain, sun and snow
September is usually the wettest month. It brings about 6.1 inches (155 mm) of rain over 22 days, while January is the driest. June brings the most sunshine, averaging 12.2 hours of sun a day.
Season by season
March through May
March through May in San Juan is hot, with daytime highs averaging 86°F (30°C) and nights around 73°F (23°C); expect showers on roughly 49 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
June through August
June through August in San Juan brings hot afternoons, with daytime highs averaging 88°F (31°C) and nights around 77°F (25°C); expect showers on roughly 55 days across the season.
September through November
September through November in San Juan brings hot afternoons, with daytime highs averaging 86°F (30°C) and nights around 76°F (24°C); expect showers on roughly 64 days across the season.
December through February
December through February in San Juan brings hot afternoons, with daytime highs averaging 83°F (28°C) and nights around 72°F (22°C); expect showers on roughly 47 days across the season.
Average temperatures in San Juan by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 83° | 71° | 14 | 2.1 in | 10.8 h/day | 77% |
| February | 83° | 72° | 15 | 2.4 in | 10.8 h/day | 75% |
| March | 84° | 72° | 15 | 2.2 in | 11.1 h/day | 73% |
| April | 85° | 73° | 16 | 3.1 in | 11.7 h/day | 74% |
| May | 87° | 75° | 17 | 3.1 in | 11.9 h/day | 75% |
| June | 89° | 76° | 17 | 2.4 in | 12.2 h/day | 75% |
| July | 88° | 77° | 19 | 3.1 in | 12.0 h/day | 76% |
| August | 88° | 77° | 19 | 3.6 in | 11.5 h/day | 78% |
| September | 88° | 77° | 22 | 6.1 in | 10.8 h/day | 81% |
| October | 87° | 76° | 22 | 4.9 in | 10.3 h/day | 82% |
| November | 85° | 74° | 20 | 5.3 in | 9.7 h/day | 82% |
| December | 83° | 73° | 18 | 2.4 in | 10.6 h/day | 79% |