Castillo de San Marcos National Monument in June
June at Castillo de San Marcos National Monument averages a daytime high near 89°F and an overnight low around 72°F, with about 6.3" of precipitation. Visitation runs about 1× the park's average month, which makes June an average month here.
- Average low
- 72°F
- Average high
- 89°F
Range across the year: 48°F to 91°F
- Precipitation
- 6.3 in
- Daylight
- 13.9 hours
Roughly 8% of the park's yearly visitors come in June: about 52,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes June the 6th-busiest of the park's twelve months, sitting between the March peak (1.5×) and the September low (0.6×).
On our Best Time to Visit score June rates 48/100 ("Fair"). Our recommended month is October: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 80°F is warm enough that midday heat is worth planning around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 1.5 miles from the park.
June falls inside the park's busiest stretch: June, July and August together pull about 24% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 13.9 hours of daylight in June to explore — near the year-round maximum.
Park-wide, 2025 drew 598,070 recreation visits, up 3.1% from 579,825 in 2024.
Across the past decade overall visitation has eased about 13.4%, so June may feel a touch quieter than it once did.
How June compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| May | 85°F / 67°F | 1.0× Average | 64 Good |
| June | 89°F / 72°F | 1.0× Average | 48 Fair |
| July | 91°F / 74°F | 1.2× Busy | 34 Poor |
All twelve months at Castillo de San Marcos, with the best time to visit.
Frequently Asked Questions
June averages a daytime high near 89°F and an overnight low around 72°F at Castillo de San Marcos National Monument, with about 6.3 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 1.5 miles from the park, so conditions inside the park can differ, especially at other elevations.
June is average at Castillo de San Marcos National Monument (about 1.0× the average month). Our best-time score rates it "Fair" at 48/100. Our recommended month is October.
The busiest month is March and the quietest is September. June sits at about 1.0× the park's average, or 8% of annual visitation.
A typical June sees about 52,000 recreation visits at Castillo de San Marcos National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Castillo de San Marcos in June
Booking a June trip to Castillo de San Marcos National Monument? Compare hotels, cabins and vacation rentals near the park with live June availability and prices.
Top-rated places to stay near Castillo de San Marcos
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Visiting Castillo de San Marcos in June?
Get crowd forecasts and lodging deals for Castillo de San Marcos by email. No spam, unsubscribe anytime.
See the full ranking of the best national parks to visit in June.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.