Weatheo

San Juan Weather by Month

Average temperatures, rainfall and humidity for San Juan, Dominican Republic, month by month, built from OpenWeather’s historical records. Use it to see what a typical San Juan month looks like before you travel — then check the live San Juan forecast for the days ahead.

Warmest month

August

33°C average high

Coolest month

February

18°C average low

Wettest month

March

79 mm of rain

Driest month

July

23 mm of rain

Average temperature and rainfall in San Juan by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January28°C18°C9°C / 34°C
51 mm
82%9 km/h
February28°C18°C10°C / 34°C
45 mm
80%10 km/h
March29°C19°C12°C / 36°C
79 mm
77%10 km/h
April30°C20°C11°C / 37°C
74 mm
77%11 km/h
May31°C21°C13°C / 36°C
63 mm
78%12 km/h
June32°C22°C12°C / 38°C
31 mm
77%13 km/h
July33°C23°C16°C / 38°C
23 mm
76%14 km/h
August33°C23°C14°C / 50°C
40 mm
77%13 km/h
September33°C22°C13°C / 37°C
43 mm
80%10 km/h
October31°C22°C14°C / 36°C
56 mm
82%9 km/h
November30°C21°C13°C / 33°C
59 mm
84%9 km/h
December29°C19°C10°C / 32°C
49 mm
84%9 km/h

Best time to visit San Juan

The most comfortable time to visit San Juan is generally December to February, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around March, totalling about 613 mm a year.

Travellers who prefer heat should aim for August, when highs average 33°C. March is the month to avoid if rain would spoil your plans — it averages 79 mm, roughly 3× the rainfall of the driest month (July).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the San Juan forecast for what is happening now.

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