Seattle, WA weather in March
Expect chilly weather with rain on most days in Seattle in March, with highs near 54°F and lows near 39°F. Rain falls on about 18 days. Pack rain gear.
- Normal high
- 54°F
- Normal low
- 39°F
- Wet days
- 18
- 3.9 in total
- Muggy days
- 0
- dew point 65°F+
How March changes from start to finish
| March 1 | March 31 | |
|---|---|---|
| Normal high | 52°F | 56°F |
| Normal low | 38°F | 41°F |
| Chance of a wet day | 57% | 56% |
| Sunrise / sunset | 6:49 am / 5:53 pm | 6:49 am / 7:37 pm |
| Daylight | 11.1 h | 12.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical March day
- 6 am42°Fdew point 38°F
- 9 am46°Fdew point 39°F
- Noon51°Fdew point 38°F
- 3 pm53°Fdew point 38°F
- 6 pm50°Fdew point 38°F
- 9 pm47°Fdew point 38°F
NOAA hourly normals (local standard time) from Seattle Boeing Fld (5 mi away); average wind 6 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph0 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow18 of 31
- Notable rainat least 0.10 in11 of 31
- Freezing nightslow 32°F or below2 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per March, counted from daily records for each year 1991-2020.
Rain in March
Normal precipitation is 3.9 in; a dry March brings about 2.7 in and a wet one about 5.0 in (25th and 75th percentiles). About 2 days bring half an inch or more. Snow is very rare.
How March varies from year to year
- Warmest March, 1991-20202015: average high 59°F
- Coolest March2002: average high 49°F
- Wettest March2014: 8.4 in
- Driest March2019: 1.6 in
- Highest reading78°F (March 20, 2019)
- Lowest reading27°F (March 10, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
March compared with February and April
| February | March | April | |
|---|---|---|---|
| Normal high | 50°F | 54°F | 59°F |
| Normal low | 37°F | 39°F | 43°F |
| Wet days | 16 | 18 | 16 |
| Comfortable days | 0 | 2 | 5 |
| Daylight | 10.3 h | 11.9 h | 13.7 h |
Highs change by +4°F from February and +5°F into April.
Nearby alternatives in March
- Drier: Friday Harbor, WA71 mi · high 53°F · 14 wet days
- Cooler: Spokane, WA228 mi · high 49°F · 12 wet days
How Seattle ranks in March
- Normal high240th warmest of 378 cities; 5th of 9 in Washington
- Wet days373rd driest of 378
- Comfortable days277th most of 339
What to pack for Seattle in March
- A warm jacket – lows near 39°F, highs near 54°F
- A rain jacket or umbrella – rain on about 18 days
Frost in March
The last spring frost typically comes around Mar 8; in 1 year in 10 it comes after Mar 29. All frost dates for Seattle.
Heating and cooling
March has 572 heating degree days and 0 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How cold is Seattle in March?
The normal high is 54°F and the normal low is 39°F. From 1991 to 2020 the coldest March reading was 27°F (March 10, 2009).
Does it rain a lot in Seattle in March?
About 18 days in March have at least 0.01 in of precipitation, and the normal total is 3.9 in. The wettest March in 1991-2020 was in 2014 (8.4 in); the driest was in 2019 (1.6 in).
Does it snow in Seattle in March?
Snow is very rare: the 1991-2020 normal for March rounds to 0.0 in.
Is March a good time to visit Seattle?
March ranks 8th of 12 months on our comfort score for Seattle (46 out of 100). It has about 2 comfortable days. The best months are June, July and August.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Seattle Sand Pt WSFO (USW00094290), 6.6 mi NNE of the city center, 60 ft (113 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Seattle Boeing Fld (USW00024234), 5.4 mi SSE of the city center, 20 ft (153 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Seattle-Tacoma International Airport (727930-24233), 11 mi S of the city center, 369 ft (196 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).