San Juan weather in August 2025

Q: How hot is it in San Juan in August?

Daytime temperatures usually reach 30°C in San Juan in August with high heat and humidity, falling to 24°C at night.

Q: How sunny is it in San Juan in August?

There are normally 9 hours of bright sunshine each day in San Juan in August - that's 68% of daylight hours.

Q: How warm is the sea around San Juan in August?

The average sea temperature around San Juan in August is 28°C.

Q: Does it rain in San Juan in August?

There are usually 20 days with some rain in San Juan in August and the average monthly rainfall is 195mm.

Q: What is the chance of a cyclone in San Juan in August?

On average less than 1 day in August in San Juan is likely to be affected by the passage of one or more tropical storms.

Expect 86°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in San Juan in August. Check more long-term weather averages for San Juan in August before you book your next holiday to Puerto Rico in 2025/2026.

86
86°F max day temperature
9
9 hours of sunshine per day
20
20 days with some rainfall
75
75°F min night temperature
13
13 hours of daylight per day
H
High heat & humidity
7.7
7.7 inches of monthly rainfall
11
11+ (Extreme) UV index
82
82°F sea temperature

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The August weather guide for Puerto Rico (San Juan) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

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How hot is it in San Juan in August?

Daytime temperatures usually reach 86°F in San Juan in August with high heat and humidity, falling to 75°F at night.

How sunny is it in San Juan in August?

There are normally 9 hours of bright sunshine each day in San Juan in August - that's 68% of daylight hours.

How warm is the sea around San Juan in August?

The average sea temperature around San Juan in August is 82°F.

Does it rain in San Juan in August?

There are usually 20 days with some rain in San Juan in August and the average monthly rainfall is 7.7 inches.

What is the chance of a hurricane in San Juan in August?

On average less than 1 day in August in San Juan is likely to be affected by the passage of one or more tropical storms.

San Juan August sunrise & sunset times

Browse the sunrise and sunset times for San Juan in August 2025. Select a month to view San Juan sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Friday, 1st August 2025	06:02	18:59
Saturday, 16th August 2025	06:07	18:50
Sunday, 31st August 2025	06:10	18:39

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Puerto Rico - quick facts
Flight time^✝	12 to 13 hours
Time difference	UK -4 hours
Language(s)	Spanish, English
Currency	United States Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Nature Nightlife
Tourist info	Discover Puerto Rico