San Juan Island National Historical Park in April
April at San Juan Island National Historical Park averages a daytime high near 57°F and an overnight low around 41°F, with about 1" of precipitation. Visitation runs about 0.8× the park's average month, which makes April a quiet month here.
- Average low
- 41°F
- Average high
- 57°F
Range across the year: 37°F to 73°F
- Precipitation
- 1.0 in
- Daylight
- 13.4 hours
Roughly 7% of the park's yearly visitors come in April: about 29,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes April the 6th-busiest of the park's twelve months, sitting between the July peak (1.8×) and the January low (0.5×).
On our Best Time to Visit score April rates 61/100 ("Good"). Our recommended month is October: the lightest crowds of the park's good-weather months.
The daily average of about 49°F is cool, so layers and a shorter daylight window matter. These figures are 1991–2020 NOAA climate normals from the nearest station, about 1.7 miles from the park.
Because June, July and August together draw about 42% of annual visitors, choosing April instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 13.4 hours of daylight in April to explore — between the 8.1-hour midwinter low and the 15.9-hour summer high.
Park-wide, 2025 drew 420,922 recreation visits, up 3.7% from 405,925 in 2024.
Across the past decade overall visitation has risen about 68.5%, so a April visit is likely to feel busier than it did a few years ago.
How April compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| March | 53°F / 38°F | 0.7× Quiet | 57 Fair |
| April | 57°F / 41°F | 0.8× Quiet | 61 Good |
| May | 64°F / 44°F | 1.1× Average | 61 Good |
All twelve months at San Juan Island, with the best time to visit.
Things to do at San Juan Island in April
The National Park Service tags 7 San Juan Island activities for spring. Each links to the park's own page for it.
- Biking on San Juan Island · reservation required
- Go Kayaking · 15-300 minutes
- Observe Animals on San Juan Island
- Picnicking on San Juan Island
- San Juan Island Junior Ranger Program
- Take in the Views on San Juan Island
- Visit a Beach · 0-24 hours
Frequently Asked Questions
April averages a daytime high near 57°F and an overnight low around 41°F at San Juan Island National Historical Park, with about 1 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 1.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
April is quiet at San Juan Island National Historical Park (about 0.8× the average month). Our best-time score rates it "Good" at 61/100. Our recommended month is October.
The busiest month is July and the quietest is January. April sits at about 0.8× the park's average, or 7% of annual visitation.
A typical April sees about 29,000 recreation visits at San Juan Island National Historical Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near San Juan Island in April
Booking a April trip to San Juan Island National Historical Park? Compare hotels, cabins and vacation rentals near the park with live April availability and prices.
Top-rated places to stay near San Juan Island
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 April.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.