March weather forecastSeattle, WA
March
Weather in March
March heralds the beginning of spring in Seattle, bringing an aura of freshness and rejuvenation. The shift from winter to spring is subtle - more noticeable in the blooming flora than in the slow rise of temperatures. Still, conditions are a step warmer than February, showing a slight increase in average daily sunshine. Mariners can anticipate better visibility with the lifting fog, making it an exciting time for boat trips on Elliot Bay. Seattle begins to see longer daylight hours, which encourages residents to spend more time outdoors.Temperature
March registers an average high-temperature of a cool 50.5°F (10.3°C), slightly varied from February's 46.2°F (7.9°C). Seattle records a steady low-temperature average of 37.4°F (3°C) during March.Humidity
The average relative humidity in March is 82%.Rainfall
In Seattle, in March, during 8.9 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, there are 84.2 rainfall days, and 5.2" (132mm) of precipitation is accumulated.Snowfall
January through March and November are months with snowfall. March is the last month it regularly snows. During 0.5 snowfall days, in March, Seattle aggregates 0.08" (2mm) of snow. Throughout the year, there are 4.8 snowfall days, and 0.94" (24mm) of snow is accumulated.Ocean temperature
In March, the average ocean temperature is 45.9°F (7.7°C).Note: Entering waters of 45.9°F (7.7°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
The average length of the day in March is 11h and 57min.On the first day of the month, sunrise is at 6:47 am and sunset at 5:54 pm PST. On the last day of March, sunrise is at 6:47 am and sunset at 7:38 pm PDT.
Note: On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time lasts until Sunday, November 3. 2024, at 2:00 am; consequently, the time zone reverts from PDT to PST.
Sunshine
In March, the average sunshine is 6.3h.UV index
In Seattle, the average daily maximum UV index in March is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In March, the maximum UV index of 3 suggests this advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in March
Seattle, WA
- Average high temperature in March: 50.5°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in March: 37.4°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).
Average pressure in March
Seattle, WA
- Average pressure in March: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in March
Seattle, WA
- Average wind speed in March: 5.3mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in March
Seattle, WA
- Average humidity in March: 82%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in March
Seattle, WA
- Average rainfall in March: 0.35"
The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in March
Seattle, WA
- Average rainfall days in March: 8.9 days
The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in March
Seattle, WA
- Average snowfall in March: 0.08"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in March
Seattle, WA
- Average snowfall days in March: 0.5 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in March
Seattle, WA
- Average sea temperature in March: 45.8°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in March /
Average sunshine in March
Seattle, WA
- Average daylight in March: 11h and 54min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in March: 6h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in March
Seattle, WA
- Average sunshine days in March: 18.6 days
The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).
Average UV index in March
Seattle, WA
- Average UV index in March: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in March
Seattle, WA
- Average cloud cover in March: 52
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in March
Seattle, WA
- Average visibility in March: 5mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
