Grass Valley, Oregon Weather
Rufous Hummingbirds Arrive. Day 77 of spring. Read this microseason across nine climate regions →
Grass Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Light Drizzle17%0.01″70°52°—
- ThursdayJun 4Clear——66°43°-4°
- FridayJun 5Overcast——66°42°0°
- SaturdayJun 6Overcast17%—59°45°-7°
- SundayJun 7Overcast——66°40°+7°
- MondayJun 8Light Drizzle22%0.03″57°49°-9°
- TuesdayJun 9Overcast18%—60°48°+3°
Ozone at AQI 42 — peak already passed at 1 PM under overcast skies. AQI up 21 in the last 6 hours — air quality is degrading. Levels should ease through evening.
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 42 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 42
- UV peak
- 1.0 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 42
PM × Wind × Precip
PM2.5/PM10 ratio 0.70 with 17 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.70
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:54 AM
- Moonset
- 3:53 PM
- In sign
- ♑︎ Capricorn
Rufous Hummingbirds Arrive
Grass Valley at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: May 18 (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
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.