March weather forecast
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington

Weather in March

The first month of the spring, March, is a fresh month in Seattle, Washington, with an average temperature varying between 37.4°F (3°C) and 50.5°F (10.3°C).

Temperature

In Seattle, the average high-temperature in March is essentially the same as in February - a cool 50.5°F (10.3°C). The average low-temperature, in Seattle, is 37.4°F (3°C).

Humidity

The average relative humidity in March in Seattle is 82%.

Rainfall

In Seattle, during March, the rain falls for 8.9 days and regularly aggregates up to 0.35" (9mm) of precipitation. Throughout the year, there are 84.2 rainfall days, and 5.2" (132mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Seattle are January through March and November. March is the last month it regularly snows in Seattle. During 0.5 snowfall days, Seattle aggregates 0.08" (2mm) of snow. In Seattle, during the entire year, snow falls for 4.8 days and aggregates up to 0.94" (24mm) of snow.

Ocean temperature

In March, the average ocean temperature in Seattle, Washington, is 45.9°F (7.7°C).
Note: Swimming in 45.9°F (7.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Seattle, the average length of the day in March is 11h and 57min.
On the first day of the month, sunrise is at 6:48 am and sunset at 5:54 pm PST. On the last day of March, sunrise is at 6:49 am and sunset at 7:37 pm PDT.
Note: On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time lasts until Sunday, November 6. 2022, at 2:00 am; consequently, the time zone reverts from PDT to PST.

Sunshine

The average sunshine in March is 6.3h.

UV index

The average daily maximum UV index in March is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 3 in March transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in March in Seattle?

In March, in Seattle, the average high-temperature is 50.5°F (10.3°C), and the average low-temperature is 37.4°F (3°C).

What is the average humidity in March in Seattle?

The average relative humidity in March is 82%.

How much does it rain in Seattle in March?

In Seattle, Washington, in March, during 8.9 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

What is the last month it snows in Seattle?

March is the last month it regularly snows in Seattle. During 0.5 snowfall days, in March, Seattle aggregates 0.08" (2mm) of snow.

What is the ocean temperature in March in Seattle?

In Seattle, the average seawater temperature in March is 45.9°F (7.7°C). Swimming in 45.9°F (7.7°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Seattle have in March?

In March, the average day length is 11h and 57min.

When is the sunrise / sunset in March in Seattle?

On the first day of March in Seattle, sunrise is at 6:48 am and sunset at 5:54 pm PST. On the last day of the month, sunrise is at 6:49 am and sunset at 7:37 pm PDT.

When does Daylight Saving Time (DST) start in March in Seattle?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. DST ends Sunday, November 6. 2022, at 2:00 am.

How many hours of sunshine does Seattle have in March?

In March, the average sunshine duration in Seattle, Washington, is 6.3h.

What is the UV index intensity in March in Seattle?

In Seattle, the average daily maximum UV index in March is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in March
Seattle, WA

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).

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Average pressure in March
Seattle, WA

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).

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Average wind speed in March
Seattle, WA

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).

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Average humidity in March
Seattle, WA

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%).

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Average rainfall in March
Seattle, WA

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").

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Average rainfall days in March
Seattle, WA

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).

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Average snowfall in March
Seattle, WA

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").

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Average snowfall days in March
Seattle, WA

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).

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Average sea temperature in March
Seattle, WA

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).

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Average daylight in March /
Average sunshine in March
Seattle, WA

Average daylight in March / Average sunshine in March - Seattle, WA
  • Average daylight in March: 11h and 57min

The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 31min).

  • 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).

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Average sunshine days in March
Seattle, WA

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).

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Average UV index in March
Seattle, WA

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).

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Average cloud cover in March
Seattle, WA

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).

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Average visibility in March
Seattle, WA

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).

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