Seattle Weather in March
United States · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
March in Seattle sees average temperatures ranging from a low of 3.5°C (38.3°F) to a high of 10.4°C (50.7°F), with a mean of 6.6°C (43.9°F). Compared to the annual average of 11.3°C (52.3°F), this month is 4.7°C cooler than the yearly norm. Precipitation averages 83.9mm, making it approximately 13.0mm drier than the monthly average of 97.0mm. The city receives an average of 7.3 hours of sunshine per day during March, with relative humidity averaging 79.9%. Wind speeds reach an average maximum of 19.7 km/h. Snowfall averages 2.3cm during March, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Seattle, with drier-than-average conditions compared to the rest of the year.
Seattle's reputation for rain is exaggerated but not entirely wrong. The city receives about 950mm of annual precipitation, but the rain comes as frequent light drizzle rather than heavy downpours. I've tracked the data and found that the summer months from July to September are remarkably dry and pleasant, with temperatures around 22°C. The best time for visiting is clearly August, when the city is at its sunniest.
March vs Adjacent Months
| Metric | February | March | April |
|---|---|---|---|
| Mean Temp | 5.2°C (41.4°F) | 6.6°C (43.9°F) | 9.0°C (48.2°F) |
| Rainfall | 105.4mm | 83.9mm | 67.3mm |
| Sunshine | 4.9 hrs | 7.3 hrs | 9.1 hrs |
| Humidity | 82.0% | 79.9% | 75.7% |
| Wind | 20.7 km/h | 19.7 km/h | 20.6 km/h |
| Rainy Days | 19.6 | 18.6 | 17.0 |
| Snowfall | 7.8 cm | 2.3 cm | 1.5 cm |
Seasonal Context
March falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Seattle in March, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Seattle in March?
The average temperature in Seattle during March ranges from 3.5°C (38.3°F) to 10.4°C (50.7°F), with a mean of 6.6°C (43.9°F).
How much does it rain in Seattle in March?
Seattle receives an average of 83.9mm of precipitation in March, spread across approximately 18.6 rainy days.
What should I pack for Seattle in March?
Based on March weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is March a good time to visit Seattle?
March is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Seattle
Cities with Similar March Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 47.61°, -122.33°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.