Seattle weather in April
April in Seattle: cool, rainy, with clean air — a great time to visit.
#6 of 12 months in Seattle · #384 of 604 destinations to visit in April · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Seattle climate normals — April
| Daytime high | 14°C / 57°F | 🙂 cool |
|---|---|---|
| Nighttime low | 5°C / 41°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 91 mm / 3.6 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 4°C / 39°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 13.7 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 0.3 cm / 0.1 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Seattle in April — FAQ
- Is April a good time to visit Seattle?
- April in Seattle: cool, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Seattle on SeasonMap's comfort score (76/100).
- What is the weather like in Seattle in April?
- In April, Seattle averages a daily high of 14°C and a low of 4.8°C, with about 91 mm of rain over roughly 15.4 rainy days.
- What is the air quality in Seattle in April?
- Seattle has a mean US Air Quality Index of about 39 in April.