Janesville, Wisconsin Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Janesville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast41%—82°68°—
- SundayJul 5Overcast17%—81°64°-1°
- MondayJul 6Overcast——79°61°-2°
- TuesdayJul 7Overcast——81°58°+2°
- WednesdayJul 8Drizzle19%—81°60°0°
- ThursdayJul 9Light Showers47%0.05″73°67°-8°
- FridayJul 10Partly Cloudy31%—79°58°+6°
AQI 25 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
- Present
- AQI 31
- UV peak
- 4.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 4.7 µg/m³, PM10 at 6.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.73
- Wind
- breezy
- 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
- 10:54 PM
- Moonset
- 9:59 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Janesville at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: May 2 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 53545, 53546, 53548
16-Day Forecast — Janesville
- Sat81°68°41%
- Sun81°64°17%
- Mon79°61°3%
- Tue81°58°2%
- Wed81°60°19%
- Thu73°67°47%
- Fri79°58°31%
- Sat81°61°9%
- Sun67°58°12%
- Mon73°54°9%
- Tue75°58°6%
- Wed79°61°25%
- Thu82°66°14%
- Fri83°67°26%
- Sat86°69°30%
- Sun83°70°29%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Janesville
Right now in the garden
Peak growing season
As of July 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.
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
- 53545
- 53546
- 53548
- 53547