Seattle, Washington Weather
Fog locks the valleys. Day 93 of summer. Read this microseason across nine climate regions →
Seattle weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 2:41 AM PDT · Open-Meteo
- TodaySep 21Clear——68°48°—
- TuesdaySep 22Overcast——64°54°-4°
- WednesdaySep 23Overcast10%—70°49°+6°
- ThursdaySep 24Showers49%0.52″58°51°-12°
- FridaySep 25Showers47%0.66″64°49°+6°
- SaturdaySep 26Overcast——63°48°-1°
- SundaySep 27Overcast16%—70°50°+7°
Air quality now AQI 59 · Moderate
AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 12.7 µg/m³ (AQI 58) with a 0.98 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 12.7 µg/m³ (AQI 58) with a 0.98 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.98
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- —
- Moonset
- 1:07 AM
- In sign
- ♑︎ Capricorn
Fog locks the valleys
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Seattle at a glance
- Today vs. normal: Today averages 58°F (high 68°F, low 48°F), 3°F below the 61°F normal for Sep 21
- Last frost: March 8 (1991–2020 median, NOAA station 9 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant beans, squash, fall brassicas, carrots; harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Seattle
- Mon68°48°1%
- Tue64°54°9%
- Wed70°49°10%
- Thu58°51°49%
- Fri64°49°47%
- Sat63°48°5%
- Sun70°50°16%
- Mon69°51°11%
- Tue71°51°15%
- Wed70°53°16%
- Thu73°52°26%
- Fri59°50°22%
- Sat60°48°16%
- Sun64°45°19%
- Mon58°45°26%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Seattle
Interactive wind and temperature map centered on Seattle — it loads in your browser. Open the full weather map.
Right now in the garden
Late season
As of September 21, the first frost (around November 23) is about 9 weeks away. Frost-tender plants keep producing until then. This city's planting calendar for September: plant beans, squash, fall brassicas, and carrots; harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Seattle
Seattle sits in King County, where the year’s longest day runs 15h 59m of daylight and its shortest just 8h 25m — a swing of +7h 34m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Seattle is the state’s largest city. The nearest town Seattle tracks is Bellevue, roughly 8 miles to the ESE.
Air quality in Seattle
Air quality in Seattle’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 41). See the full air-quality history for Seattle.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes | lettuce, spinach, radishes |
| April | — | lettuce, peas, spinach, radishes |
| May | — | lettuce, peas, spinach, garlic |
| June | tomatoes, peppers, beans, squash | peas, garlic |
| July | tomatoes, peppers, beans, squash | — |
| August | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash |
| September | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| November | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
A year in weather
August is Seattle's warmest stretch (~67°F) and December its coldest (~42°F); precipitation crests in November at 5.8 inches and ebbs in July to 0.8 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 42° | 5.1″ | 19 |
| February | 43° | 3.5″ | 16 |
| March | 47° | 3.9″ | 18 |
| April | 51° | 3.0″ | 16 |
| May | 57° | 2.2″ | 12 |
| June | 61° | 1.6″ | 11 |
| July | 67° | 0.8″ | 5 |
| August | 67° | 1.0″ | 6 |
| September | 62° | 1.7″ | 9 |
| October | 54° | 3.6″ | 15 |
| November | 46° | 5.8″ | 19 |
| December | 42° | 5.5″ | 20 |
Regional context
Similar climates Medina, WA, Hunts Point, WA, Clyde Hill, WA
In Seattle, NOAA NCEI 1991-2020 normals put January near 42°F and July near 67°F — a 24°F seasonal arc — with about 37.8 inches of precipitation over 163 rainy or snowy days.
Cool-season fronts carry Seattle's rain: November logs 5.8 inches on 18.6 days, against July's 0.8 inches on 5.4 — winter does the heavy lifting in Seattle. That cool-season-wet pattern aligns Seattle with places like Medina, WA, Hunts Point, WA and Clyde Hill, WA.
Seattle reaches its last hard frost near March 8; that is the cue for peas, lettuce, spinach, and radishes. Tomatoes and peppers do best set out two weeks later in Seattle, once nights clear the mid-40s°F. Frost returns to Seattle near November 23, ending the tender-crop season. That date is a median: Seattle freezes sooner in half of years.
Similar climates: Medina, WA, Hunts Point, WA, Clyde Hill, WA, Yarrow Point, WA, Mercer Island, WA.
Frequently asked
- When does it freeze in Seattle?
- Frost typically leaves Seattle by March 8 and returns to Seattle near November 23.
- What is the rainy season in Seattle?
- Seattle sees its heaviest rain in November (around 5.8 inches), part of roughly 38 inches a year.
- What is the warmest month in Seattle?
- August is Seattle's warmest month, averaging about 67°F.
- What is the coldest month in Seattle?
- Seattle bottoms out in December, with a mean near 42°F.
- When can I start a vegetable garden in Seattle?
- Seattle's last frost (March 8) cues hardy greens; in Seattle, hold heat-lovers two weeks past.
- How many rainy days does Seattle get?
- Seattle records around 163 days of measurable precipitation annually.
- What hardiness zone is Seattle?
- Seattle sits in the USDA zone set by December lows near 42°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Seattle?
- Seattle's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Seattle?
- See this week's day-by-day rain chances for Seattle in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Seattle?
- Current conditions for Seattle and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Seattle forecast updated?
- The Seattle forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Seattle?
- Today's sunrise and sunset times for Seattle are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Seattle?
- The next few days in Seattle's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Seattle sits at 47.6°N; its climate zone is warm-summer Mediterranean (Köppen approximation).
ZIP codes in Seattle
- 98101
- 98102
- 98103
- 98104
- 98105
- 98106
- 98107
- 98108
- 98109
- 98111
- 98112
- 98113
- 98114
- 98115
- 98116
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- 98119
- 98121
- 98122
- 98124
- 98125
- 98126
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- 98129
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- 98134
- 98136
- 98139
- 98141
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- 98155
- 98158
- 98161
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- 98165
- 98166
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- 98174
- 98175
- 98177
- 98178
- 98181
- 98185
- 98188
- 98191
- 98194
- 98195
- 98198
- 98199