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Seattle in May: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Seattle in May is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 17 °C, and the sea is about 10 °C. With about 13 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
48/100 · #5
Warmth
#5
Dryness
#5
Sun
#4
Sea warmth
#6
Published best categories: none
Seattle · MayPhoto: Daniel Schwen · CC BY-SA 4.0Climate facts
- Average high
- 17 °C
- Average low
- 8 °C
- Sea
- 10 °C
- Rainy days (est.)
- 13 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 80 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| April | 14 | 5 | 17 | 98 | 5.2 | 82 | 0.8 | 9 | 30 |
| May (selected) | 17 | 8 | 13 | 70 | 6.5 | 80 | 0.6 | 10 | 48 |
| June | 20 | 10 | 11 | 55 | 7.1 | 80 | 0.6 | 11 | 58 |
How do the previous and next months compare?
Baseline: May (48/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| April | -18 | -3.8 °C | -3.2 °C | +4.3 | +27.3 mm | -1.3 h | +1.8 % | +0.1 m/s | -1 °C |
| June | +10 | +2.4 °C | +2.4 °C | -1.7 | -15.7 mm | +0.6 h | +0.1 % | -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 May?
The average daily high is around 17 °C, with an average daily low of about 8 °C.
Can you swim in Seattle in May?
The sea is about 10 °C (cold).
Does it rain a lot in Seattle in May?
The curated estimate is about 13 rainy days per month, not a directly measured long-term average. Total precipitation averages around 70 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. May is not among them.