Janesville, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Janesville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——90°62°—
- MondayJul 6Overcast——89°61°-1°
- TuesdayJul 7Overcast——91°57°+2°
- WednesdayJul 8Overcast——93°55°+2°
- ThursdayJul 9Clear——94°59°+1°
- FridayJul 10Partly Cloudy——96°59°+2°
- SaturdayJul 11Overcast——99°61°+3°
AQI 25 (Good), driven by Ozone. AQI down 11 over the last 6 hours (gradual decline). Ozone at AQI 49. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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 49. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 49
- UV peak
- 8.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 27
PM × Wind × Precip
PM2.5 at 4.8 µg/m³, PM10 at 8.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.56
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:22 PM
- Moonset
- 11:19 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Janesville at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 96114
16-Day Forecast — Janesville
- Sun90°62°2%
- Mon89°61°2%
- Tue91°57°0%
- Wed93°55°0%
- Thu94°59°0%
- Fri96°59°0%
- Sat99°61°1%
- Sun98°63°1%
- Mon100°67°5%
- Tue101°72°6%
- Wed95°73°5%
- Thu85°63°3%
- Fri95°61°10%
- Sat100°67°9%
- Sun101°68°13%
- Mon97°69°12%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
SPC Convective Outlook
Storm Prediction Center — Janesville
SPC includes Janesville in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- 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.
ZIP codes in Janesville
- 96114