San Juan, Puerto Rico Climate & Monthly Averages
The climate of 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.
Climate 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.
Monthly climate table
| 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% |
San Juan month by month
San Juan weather in January
January brings highs around 83°F (28°C), lows near 71°F (22°C), about 14 wet days - typically the coldest month and the driest month of the year in San Juan.
San Juan weather in February
February brings highs around 83°F (28°C), lows near 72°F (22°C), about 15 wet days.
San Juan weather in March
March brings highs around 84°F (29°C), lows near 72°F (22°C), about 15 wet days.
San Juan weather in April
April brings highs around 85°F (30°C), lows near 73°F (23°C), about 16 wet days.
San Juan weather in May
May brings highs around 87°F (31°C), lows near 75°F (24°C), about 17 wet days.
San Juan weather in June
June brings highs around 89°F (32°C), lows near 76°F (25°C), about 17 wet days - typically the sunniest month of the year in San Juan.
San Juan weather in July
July brings highs around 88°F (31°C), lows near 77°F (25°C), about 19 wet days - typically the hottest month of the year in San Juan.
San Juan weather in August
August brings highs around 88°F (31°C), lows near 77°F (25°C), about 19 wet days.
San Juan weather in September
September brings highs around 88°F (31°C), lows near 77°F (25°C), about 22 wet days - typically the wettest month of the year in San Juan.
San Juan weather in October
October brings highs around 87°F (30°C), lows near 76°F (24°C), about 22 wet days.
San Juan weather in November
November brings highs around 85°F (29°C), lows near 74°F (24°C), about 20 wet days.
San Juan weather in December
December brings highs around 83°F (28°C), lows near 73°F (23°C), about 18 wet days.
Seasons in San Juan
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.
Climate questions, answered
What is the average temperature in San Juan?
Is San Juan hot in summer?
Is San Juan cold in winter?
How many rainy days does San Juan get in a year?
Best time to visit San Juan
The best time to visit San Juan is generally December to March, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 83°F (28°C).
Pack for San Juan with lightweight, breathable clothing and strong sun protection for the hot months; a compact umbrella or rain shell - showers are a regular feature; moisture-wicking fabrics to cope with the humidity. Evenings can feel noticeably cooler than afternoons - July nights average 77°F (25°C).
San Juan temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.