Grand Coulee, Washington Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Grand Coulee weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Overcast——72°53°—
- SaturdayJun 6Overcast——63°46°-9°
- SundayJun 7Overcast——66°40°+3°
- MondayJun 8Heavy Drizzle10%0.08″63°49°-3°
- TuesdayJun 9Drizzle36%0.02″54°49°-9°
- WednesdayJun 10Overcast20%—68°48°+14°
- ThursdayJun 11Partly Cloudy21%—74°46°+6°
AQI 41 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 36 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
- Present
- AQI 36
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 16
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).
The higher the clouds, the finer the weather.
- Moonrise
- 7:22 AM
- Moonset
- 4:47 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Grand Coulee at a glance
- Today vs. normal: 5°F below the seasonal normal for this latitude
- Last frost: June 3 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Warm-season window is open
As of June 5, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
SPC Convective Outlook
Storm Prediction Center — Grand Coulee
SPC has placed Grand Coulee in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.