San Juan National Historic Site in August
August at San Juan National Historic Site averages a daytime high near 89°F and an overnight low around 76°F, with about 7.7" of precipitation. Visitation runs about 0.9× the park's average month, which makes August an average month here.
- Average low
- 76°F
- Average high
- 89°F
Range across the year: 69°F to 89°F
- Precipitation
- 7.7 in
- Daylight
- 12.6 hours
Roughly 8% of the park's yearly visitors come in August: about 87,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes August the 8th-busiest of the park's twelve months, sitting between the March peak (1.4×) and the September low (0.5×).
On our Best Time to Visit score August rates 41/100 ("Poor"). Our recommended month is January: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 82°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.
August falls inside the park's busiest stretch: June, July and August together pull about 27% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 12.6 hours of daylight in August to explore — between the 10.9-hour midwinter low and the 13.1-hour summer high.
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 August visit is likely to feel busier than it did a few years ago.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 88°F / 76°F | 1.3× Busy | 29 Poor |
| August | 89°F / 76°F | 0.9× Average | 41 Poor |
| September | 89°F / 75°F | 0.5× Quiet | 57 Fair |
All twelve months at San Juan, with the best time to visit.
Things to do at San Juan in August
The National Park Service tags 6 San Juan activities for summer. 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
August averages a daytime high near 89°F and an overnight low around 76°F at San Juan National Historic Site, with about 7.7 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.
August is average at San Juan National Historic Site (about 0.9× the average month). Our best-time score rates it "Poor" at 41/100. Our recommended month is January.
The busiest month is March and the quietest is September. August sits at about 0.9× the park's average, or 8% of annual visitation.
A typical August sees about 87,000 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 August
Booking a August trip to San Juan National Historic Site? Compare hotels, cabins and vacation rentals near the park with live August 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 August.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.