San Juan National Historic Site in August
In August, San Juan National Historic Site averages a high of 89°F and a low of 78°F, with 6.3 inches of precipitation (rain plus melted snow). About 96,000 people visit, the 9th busiest of 12 (busy). Days are 12 hours 45 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 89° / 78°F
- Precipitation
- 6.3in
- Snow
- 0in
- Daylight
- 12h 45m
- Visitors
- 96,000
- Crowds
- Busy
Best months for weather and crowds instead: January (busy) and February (busy).
Higher or lower in the park, expect a different picture: Aibonito 1 S, PR at 2,330 ft averages a August high of 82°F and a low of 68°F.
Weather 1991–2020 averages at San Juan L M Marin AP, PR, 7.6 miles from the park's center, 9 ft. Second station higher up: Aibonito 1 S, PR, 2,330 ft, 25.3 miles. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in August
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Virgin Islands National Park | 90° / 80° | Moderate | Hot |
| Biscayne National Park | 91° / 79° | Busy | Very hot |
| Everglades National Park | 91° / 76° | Busy | Very hot |
| Big Cypress National Preserve | 92° / 74° | Moderate | Very hot |
| Dry Tortugas National Park | 91° / 79° | Busy | Very hot |
Closures, reservations and alerts: San Juan National Historic Site on nps.gov
All twelve months at San Juan National Historic Site · National parks to visit in August