San Juan National Historic Site in December
In December, San Juan National Historic Site averages a high of 84°F and a low of 73°F, with 4.8 inches of precipitation (rain plus melted snow). About 144,000 people visit, the 2nd busiest of 12 (very busy). Days are 11 hours 02 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 84° / 73°F
- Precipitation
- 4.8in
- Snow
- 0in
- Daylight
- 11h 2m
- Visitors
- 144,000
- Crowds
- Very 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 December high of 75°F and a low of 64°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 December
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Virgin Islands National Park | 85° / 75° | Very busy | Hot |
| Biscayne National Park | 80° / 66° | Busy | Mild |
| Everglades National Park | 78° / 61° | Busy | Mild |
| Big Cypress National Preserve | 77° / 55° | Busy | Mild |
| Dry Tortugas National Park | 76° / 67° | Busy | Mild, wet |
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 December