San Juan weather

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The weather guide for San Juan, Puerto Rico shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

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Which is the hottest month in San Juan?

The hottest time of year in San Juan is normally September. Expect maximum daytime temperatures to reach 30°C with high heat and humidity.

Which month has the most rain in San Juan?

In terms of rainfall, August is usually the wettest month in San Juan with 195mm on average. There are normally 20 days in August with some rain.

When is it sunniest in San Juan?

The sunniest time of year in San Juan is normally March with bright sunshine on average for 75% of daylight hours; that's 9 hours of sunshine per day.

When is the sea warmest in San Juan?

The sea is usually at its warmest in San Juan in September when the water temperature reaches 29°C.

Metric (°C / mm)  |  Imperial (°F / inches)

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Compare San Juan weather with the USA

Below the San Juan weather chart shows average maximum daytime temperature for San Juan, Puerto Rico and the USA (Washington).

Maximum daytime temperature (°C)

San Juan, Puerto Rico
USA (Washington)
Jan
Feb
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Apr
May
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Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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Tropical storm risk: San Juan, Puerto Rico hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
0
2.2%
3.5%
1.3%
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

The San Juan, Puerto Rico tropical storm risk chart above shows the hurricane season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.

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Where's hot in Puerto Rico right now?

Below are the temperatures expected today at popular destinations in Puerto Rico. Select a destination to compare today's forecast with average weather conditions.

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