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Seattle in April: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Seattle in April is climatically mixed. The average daily high is around 14 °C, and the sea is about 9 °C. With about 17 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
30/100 · #7
Warmth
#7
Dryness
#8
Sun
#5
Sea warmth
#8
Published best categories: none
Seattle · AprilPhoto: Daniel Schwen · CC BY-SA 4.0Climate facts
- Average high
- 14 °C
- Average low
- 5 °C
- Sea
- 9 °C
- Rainy days (est.)
- 17 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| March | 11 | 3 | 19 | 130 | 3.6 | 85 | 0.8 | 8 | 21 |
| April (selected) | 14 | 5 | 17 | 98 | 5.2 | 82 | 0.8 | 9 | 30 |
| May | 17 | 8 | 13 | 70 | 6.5 | 80 | 0.6 | 10 | 48 |
How do the previous and next months compare?
Baseline: April (30/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| March | -9 | -2.7 °C | -1.7 °C | +1.8 | +32.6 mm | -1.6 h | +3.3 % | +0.1 m/s | -0.7 °C |
| May | +18 | +3.8 °C | +3.2 °C | -4.3 | -27.3 mm | +1.3 h | -1.8 % | -0.1 m/s | +1 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Seattle in April?
The average daily high is around 14 °C, with an average daily low of about 5 °C.
Can you swim in Seattle in April?
The sea is about 9 °C (cold).
Does it rain a lot in Seattle in April?
The curated estimate is about 17 rainy days per month, not a directly measured long-term average. Total precipitation averages around 98 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Seattle?
By the climate score, July, August and September are the strongest months for Seattle. For a beach trip: July and August. April is not among them.