Arnold, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Arnold weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——78°58°—
- FridayJun 5Overcast——79°59°+1°
- SaturdayJun 6Overcast——74°52°-5°
- SundayJun 7Overcast——71°48°-3°
- MondayJun 8Rain26%0.89″59°46°-12°
- TuesdayJun 9Showers29%0.67″52°40°-7°
- WednesdayJun 10Overcast11%—69°40°+17°
Ozone at AQI 61 — peak already passed at 1 PM under clear skies. AQI up 17 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 61 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 61
- UV peak
- 7.4 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 61
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
- 6:28 AM
- Moonset
- 4:13 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Arnold at a glance
- Today vs. normal: 78°F — typical for the season
- Last frost: April 5 (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.