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Seattle in March: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Seattle in March is climatically mixed. The average daily high is around 11 °C, and the sea is about 8 °C. With about 19 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
21/100 · #8
Warmth
#8
Dryness
#9
Sun
#7
Sea warmth
#10
Published best categories: none
Seattle · MarchPhoto: Daniel Schwen · CC BY-SA 4.0Climate facts
- Average high
- 11 °C
- Average low
- 3 °C
- Sea
- 8 °C
- Rainy days (est.)
- 19 rainy days (est.)
- Sun (est.)
- 4 h/day
- Humidity
- 85 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| February | 8 | 2 | 17 | 120 | 2.3 | 87 | 0.8 | 8 | 18 |
| March (selected) | 11 | 3 | 19 | 130 | 3.6 | 85 | 0.8 | 8 | 21 |
| April | 14 | 5 | 17 | 98 | 5.2 | 82 | 0.8 | 9 | 30 |
How do the previous and next months compare?
Baseline: March (21/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| February | -3 | -2.4 °C | -1.5 °C | -2.4 | -10.1 mm | -1.3 h | +2.4 % | ±0 m/s | -0.3 °C |
| April | +9 | +2.7 °C | +1.7 °C | -1.8 | -32.6 mm | +1.6 h | -3.3 % | -0.1 m/s | +0.7 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Seattle in March?
The average daily high is around 11 °C, with an average daily low of about 3 °C.
Can you swim in Seattle in March?
The sea is about 8 °C (cold).
Does it rain a lot in Seattle in March?
The curated estimate is about 19 rainy days per month, not a directly measured long-term average. Total precipitation averages around 130 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. March is not among them.