San Juan weather in August 2025

Expect 30°C 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.

  • 30°C maximum daytime temperature in August in San Juan30
    30°C max day temperature
  • 9 hours of sunshine per day
  • 20 days with some rainfall in August in San Juan20
    20 days with some rainfall
  • 24°C minimum night-time temperature in August in San Juan24
    24°C min night temperature
  • 13 hours of daylight per day in August in San Juan13
    13 hours of daylight per day
  • High heat & humidity in August in San JuanH
    High heat & humidity
  • 195 mm monthly rainfall in August in San Juan195
    195 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in San Juan11
    11+ (Extreme) UV index
  • 28°C sea temperature in August in San Juan28
    28°C 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 / mm)  |  Imperial (°F / inches)

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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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