Mid-spring · Weather & things to do
San Juan Island in April
San Juan Island warms up: highs climb to 53°F (12°C), from 49°F in March, with lows of 44°F (7°C) and about 2.8 in (70 mm) of rain.
Our comfort score puts it mid-table at 63/100, 7th of 12.
- Avg high
- 53°F (12°C)
- Avg low
- 44°F (7°C)
- Rain
- 2.8 in (70 mm)
- Humidity
- 80%
- Cloud cover
- 73%
- Daylight
- ~13 h 26 min
- Comfort score
- 63/100 · Good
What April feels like
It's cool, with highs near 53°F (12°C), so a proper jacket stays on most of the day.
Nights cool to an average low of 44°F (7°C).
Some rain is likely, about 2.8 in (70 mm) in the month, so pack for a shower or two.
Plan around April
April sits mid-table; the best months are June – September.
- Comfort improves from 50/100 in March to 63/100.
- Our Puget Sound Islands route recommends May – Sep, so April falls outside its suggested window.
What to pack for April
- Insulated jackethighs only 53°F
- Packable rain jacket or umbrellaabout 2.8 in of rain
- Comfortable walking shoesmost picks involve some walking
What to do in San Juan Island in April
April is good outdoor weather here, so these picks lean toward the open air.
San Juan Island Brewing Company
Brewpub two blocks from the ferry with pizzas and a patio.
Why now April scores 63/100 for comfort, good conditions for being outside.
San Juan Islands Sculpture Park
Over 100 sculptures along trails at Roche Harbor.
Why now Highs near 53°F and 2.8 in of monthly rain make this an easy outdoor pick.
English Camp
British garrison site with restored buildings and a Young Hill hike.
Why now One to do outside while the weather is on your side.
The Farm at Krystal Acres
Working alpaca farm in the island's west valley, with pastures to walk and a barn shop of alpaca-wool goods.
American Camp
Open prairie and beaches from the 1859 Pig War, part of the national historical park.
Nearby in April
- Victoria in April~18 mi · highs 53°F, 2.8 in rain · similar daytime temperatures, about as wet
- Vancouver in April~52 mi · highs 53°F, 5.7 in rain · similar daytime temperatures, wetter
- Olympic NP in April~57 mi · highs 40°F, 5.4 in rain or snow · 8°C (14°F) cooler by day, wetter
- Bainbridge Island in April~67 mi · highs 57°F, 3.7 in rain · 2°C (4°F) warmer by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
San Juan Island in April: quick answers
Is April a good time to visit San Juan Island?
It's middling, scoring 63/100. The best months are June – September, at up to 95. Expect highs of 53°F (12°C) and 2.8 in (70 mm) of rain. Our Puget Sound Islands route recommends May – Sep, so April is outside its suggested window.
How cold is San Juan Island in April?
Average highs are 53°F (12°C) and average lows 44°F (7°C), making it the 6th-coldest month by daytime highs.
Does it rain a lot in San Juan Island in April?
Some: about 2.8 in (70 mm) of rain falls across April on average, the 6th-driest month of the year. The annual total is about 39.0 in (991 mm).
What should I pack for San Juan Island in April?
Bring insulated jacket (highs only 53°F), packable rain jacket or umbrella (about 2.8 in of rain) and comfortable walking shoes (most picks involve some walking).
More on San Juan Island
Planning San Juan Island in April?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.