San Juan National Historic Site in January
January at San Juan National Historic Site averages a daytime high near 82°F and an overnight low around 70°F, with about 4.8" of precipitation. Visitation runs about 1.1× the park's average month, which makes January an average month here.
- Average low
- 70°F
- Average high
- 82°F
Range across the year: 69°F to 89°F
- Precipitation
- 4.8 in
- Daylight
- 11.0 hours
Roughly 9% of the park's yearly visitors come in January: about 99,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes January the 7th-busiest of the park's twelve months, sitting between the March peak (1.4×) and the September low (0.5×).
January is our recommended month at San Juan: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 76°F is warm enough that midday heat is worth planning around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 4 miles from the park.
Because June, July and August together draw about 27% of annual visitors, choosing January instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 11 hours of daylight in January to explore — near the year-round minimum.
Park-wide, 2025 drew 1,402,132 recreation visits, up 5.4% from 1,329,728 in 2024.
Across the past decade overall visitation has risen about 7.7%, so a January visit is likely to feel busier than it did a few years ago.
How January compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| December | 83°F / 71°F | 1.3× Busy | 37 Poor |
| January | 82°F / 70°F | 1.1× Average | 51 Fair |
| February | 83°F / 69°F | 1.1× Average | 52 Fair |
All twelve months at San Juan, with the best time to visit.
Things to do at San Juan in January
The National Park Service tags 6 San Juan activities for winter. Each links to the park's own page for it.
- Capilla de Nuestra Señora de los Navegantes · reservation required
- Castillo San Cristobal - Plaza Norzagaray · reservation required
- Castillo San Cristobal - Plaza Santa Teresa · reservation required
- Castillo San Felipe del Morro, Bastion de Austria · reservation required
- El Morro, Bateria del Carmen · reservation required
- Fort San Felipe del Morro · reservation required
Frequently Asked Questions
January averages a daytime high near 82°F and an overnight low around 70°F at San Juan National Historic Site, with about 4.8 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 4 miles from the park, so conditions inside the park can differ, especially at other elevations.
January is average at San Juan National Historic Site (about 1.1× the average month). Our best-time score rates it "Fair" at 51/100. January is our recommended month for this park.
The busiest month is March and the quietest is September. January sits at about 1.1× the park's average, or 9% of annual visitation.
A typical January sees about 99,000 recreation visits at San Juan National Historic Site, based on National Park Service monthly counts from 1979–2025.
Where to stay near San Juan in January
Booking a January trip to San Juan National Historic Site? Compare hotels, cabins and vacation rentals near the park with live January availability and prices.
Top-rated places to stay near San Juan
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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See the full ranking of the best national parks to visit in January.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.