Weather in San Juan: August
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Average day temperature: | 86.9°F |
| Average night temperature: | 78.9°F | |
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Sea water temperature: | 84.0°F |
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Number of sunny days: | 6 days |
| Day length: | 12.5 - 12.9 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 2.8 in. | |
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forecast
| San Juan |
temperature
| San Juan |
Air temperature in August, °F
The highest day temperature during August of 2025 was 89°F. At the same time the lowest night temperature was 79°F. Daily and nightly averages during August were 85.7°F and 81.2°F.
Sea water temperature in San Juan in August, °F
The average sea water temperature in August of 2025 was 84.8°F. The highest and lowest sea temperatures during the month were 85.3°F and 84.2°F.
Mostly all days in August are partly cloudy but sunny or cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in San Juan in August is 2.5 in. Other months of the year show relatively similar values.
The average wind speed value in August is 11.2 mph
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 6.2.
Best time for vacation in San Juan
San Juan on a weather map
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