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San Juan weather in August 2025
Expect daytime maximum temperatures of 30°C in San Juan, Puerto Rico in August and high heat and humidity based on long-term weather averages. There are 9 hours of sunshine per day on average with 20 days with some rainfall and typically 195 mm of rainfall in the month.
- 30°C max day temperature
30 - 9 hours of sunshine per day
- 20 days with some rainfall
20 - 24°C min night temperature
24 - 13 hours of daylight per day
13 - High heat & humidity
H - 195 mm of monthly rainfall
195 - 11+ (Extreme) UV index
11 - 28°C sea temperature
28
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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 / mm) | Imperial (°F / inches)
More about Puerto Rico
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.
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 28°C.
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.
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.
JanFebMarAprMayJunJulAugSepOctNovDec
| 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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