Bellevue, Washington Weather
Fog locks the valleys. Day 93 of summer. Read this microseason across nine climate regions →
Bellevue weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 7:20 AM PDT · Open-Meteo
- TodaySep 21Overcast later——70°49°—
- TuesdaySep 22Overcast—0.02″63°52°-7°
- WednesdaySep 23Rain11%0.09″69°48°+6°
- ThursdaySep 24Rain48%0.52″58°49°-11°
- FridaySep 25Showers45%0.72″65°48°+7°
- SaturdaySep 26Overcast——65°43°0°
- SundaySep 27Light Drizzle19%0.02″66°50°+1°
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 16.5 µg/m³ (AQI 65) with a 0.98 fine-to-coarse ratio and 4 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 during the projected peak around 8 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 16.5 µg/m³ (AQI 65) with a 0.98 fine-to-coarse ratio and 4 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
- 1:06 AM
- In sign
- ♑︎ Capricorn
Fog locks the valleys
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Bellevue at a glance
- Today vs. normal: Today averages 60°F (high 70°F, low 49°F), about the 61°F normal for Sep 21
- Last frost: March 13 (1991–2020 median, NOAA station 12 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant beans, squash, fall brassicas, carrots; harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Bellevue
- Mon70°49°0%
- Tue63°52°5%
- Wed69°48°11%
- Thu58°49°48%
- Fri65°48°45%
- Sat65°43°6%
- Sun66°50°19%
- Mon61°50°14%
- Tue65°47°18%
- Wed68°45°19%
- Thu67°46°27%
- Fri65°42°39%
- Sat71°43°29%
- Sun72°44°22%
- Mon57°45°13%
- Tue61°44°23%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Bellevue
Interactive wind and temperature map centered on Bellevue — 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 16) is about 8 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 Bellevue
Bellevue 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, the state’s largest city, lies about 8 miles to the WNW. The nearest town Bellevue tracks is Seattle, roughly 8 miles to the WNW.
Air quality in Bellevue
Air quality in Bellevue’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 Bellevue.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes | spinach, radishes |
| April | — | lettuce, peas, spinach, radishes |
| May | — | lettuce, peas, spinach |
| June | tomatoes, peppers, beans, squash | lettuce, peas, garlic |
| July | tomatoes, peppers, beans, squash | — |
| August | tomatoes, peppers, beans, squash, fall brassicas, carrots | 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 | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
A year in weather
The year in Bellevue tops out in August (~67°F) and dips lowest in December (~42°F), with November wettest at 5.8 inches and July driest at 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 Beaux Arts Village, WA, Clyde Hill, WA, Mercer Island, WA
In Bellevue, 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.
Precipitation in Bellevue peaks in the cool season: November averages 5.8 inches across 18.6 storm-fed days, while July bottoms out at 0.8 inches over just 5.4 rainy days. That cool-season-wet pattern aligns Bellevue with places like Beaux Arts Village, WA, Clyde Hill, WA and Mercer Island, WA.
Around March 13, Bellevue sheds its freezing nights — peas, lettuce, spinach, and radishes go into Bellevue's beds. Heat-demanding starts go out a fortnight on in Bellevue, after the soil warms and cold snaps clear. Frost returns to Bellevue near November 16, ending the tender-crop season. Open lawns in Bellevue whiten first when frost returns.
Similar climates: Beaux Arts Village, WA, Clyde Hill, WA, Mercer Island, WA, Newcastle, WA, Medina, WA.
Frequently asked
- When does it freeze in Bellevue?
- Frost typically leaves Bellevue by March 13 and returns to Bellevue near November 16.
- What is the rainy season in Bellevue?
- Bellevue sees its heaviest rain in November (around 5.8 inches), part of roughly 38 inches a year.
- What is the warmest month in Bellevue?
- August is Bellevue's warmest month, averaging about 67°F.
- What is the coldest month in Bellevue?
- Bellevue bottoms out in December, with a mean near 42°F.
- When can I start a vegetable garden in Bellevue?
- Time tomatoes in Bellevue for two weeks after March 13; peas and greens start at Bellevue's frost line.
- How many rainy days does Bellevue get?
- Bellevue records around 163 days of measurable precipitation annually.
- What hardiness zone is Bellevue?
- Bellevue 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 Bellevue?
- Bellevue'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 Bellevue?
- See this week's day-by-day rain chances for Bellevue in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Bellevue?
- Current conditions for Bellevue and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Bellevue forecast updated?
- The Bellevue forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Bellevue?
- Today's sunrise and sunset times for Bellevue 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 Bellevue?
- The next few days in Bellevue's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Bellevue sits at 47.6°N; its climate zone is warm-summer Mediterranean (Köppen approximation).
ZIP codes in Bellevue
- 98004
- 98005
- 98006
- 98007
- 98008
- 98009
- 98015