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
  30°C max day temperature
• 9
  9 hours of sunshine per day
• 20
  20 days with some rainfall
• 24
  24°C min night temperature
• 13
  13 hours of daylight per day
• H
  High heat & humidity
• 195
  195 mm of monthly rainfall
• 11
  11+ (Extreme) UV index
• 28
  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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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.

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