Live Weather & Forecast

Weather in Janesville

Wisconsin, United States · Real-time conditions & 3-day outlook

Flag of United States
Overcast
24°C
Feels like 26°C
75°F / Feels 79°F
Overcast
Janesville, Wisconsin
🌞 Daytime
Updated: 2026-04-12 13:15
💧
Humidity
61%
💨
Wind
35.3 km/h SW
🌬️
Wind Gust
50.1 km/h
🌡️
Pressure
1010 mb
👁️
Visibility
16 km
☀️
UV Index
1.8 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
100%
💦
Dew Point
18.7°C
🌐
Wind Degree
217°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
144.9 μg/m³
NO₂
3.4 μg/m³
O₃
87 μg/m³
SO₂
1.3 μg/m³
PM 2.5
4.1 μg/m³
PM 10
4.2 μg/m³

Weather Alerts 1

Met · Severe · Immediate
Flood Warning issued April 11 at 9:24PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois...Indiana... Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, McHenry and Kane Counties. Kankakee River at Dunns Bridge affecting Jasper and Porter Counties. Kankakee River at Shelby affecting Newton and Lake IN Counties. ...The Flood Warning is extended for the following rivers in Illinois... Des Plaines River...

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation...

Effective: 2026-04-11T21:24:00-05:00  ·  Expires: 2026-04-12T15:30:00-05:00

Today's Hourly Forecast

24-hour breakdown for Janesville, Wisconsin

12 AM
Clear
9°
Clear
💧 77% 💨 20.9 km/h
1 AM
Clear
9°
Clear
💧 83% 💨 23 km/h
2 AM
Clear
9°
Clear
💧 81% 💨 22.7 km/h
3 AM
Clear
9°
Clear
💧 80% 💨 23 km/h
4 AM
Clear
9°
Clear
💧 84% 💨 21.6 km/h
5 AM
Clear
10°
Clear
💧 86% 💨 20.2 km/h
6 AM
Patchy rain nearby
11°
Patchy rain nearby
💧 89% 💨 20.5 km/h 🌧️ 100%
7 AM
Patchy rain nearby
13°
Patchy rain nearby
💧 90% 💨 25.6 km/h 🌧️ 100%
8 AM
Sunny
14°
Sunny
💧 87% 💨 30.2 km/h
9 AM
Patchy rain nearby
15°
Patchy rain nearby
💧 91% 💨 30.2 km/h 🌧️ 100%
10 AM
Patchy rain nearby
18°
Patchy rain nearby
💧 87% 💨 29.5 km/h 🌧️ 100%
11 AM
Patchy rain nearby
20°
Patchy rain nearby
💧 84% 💨 31 km/h 🌧️ 75%
12 PM
Sunny
21°
Sunny
💧 81% 💨 30.2 km/h
1 PM
Overcast
24°
Overcast
💧 61% 💨 35.3 km/h
2 PM
Sunny
23°
Sunny
💧 76% 💨 36.4 km/h
3 PM
Sunny
23°
Sunny
💧 76% 💨 37.1 km/h
4 PM
Sunny
21°
Sunny
💧 78% 💨 35.3 km/h
5 PM
Overcast
20°
Overcast
💧 91% 💨 35.3 km/h
6 PM
Overcast
19°
Overcast
💧 95% 💨 31.3 km/h
7 PM
Moderate rain
18°
Moderate rain
💧 98% 💨 27.7 km/h 🌧️ 100%
8 PM
Overcast
18°
Overcast
💧 99% 💨 25.6 km/h
9 PM
Overcast
17°
Overcast
💧 97% 💨 27.4 km/h
10 PM
Heavy rain
17°
Heavy rain
💧 98% 💨 22.3 km/h 🌧️ 100%
11 PM
Overcast
17°
Overcast
💧 97% 💨 27 km/h

3-Day Forecast

Daily overview for Janesville, Wisconsin

Today
Moderate rain
Moderate rain
23° / 8°
🌧️ 86% chance of rain
💧 Avg. humidity: 87%
💨 Max wind: 37.1 km/h
🌧️ Total precip: 16.72 mm
☀️ UV Index: 0.6
🌅 Sunrise: 06:19 AM
🌇 Sunset: 07:35 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Patchy rain nearby
Patchy rain nearby
22° / 16°
🌧️ 89% chance of rain
💧 Avg. humidity: 92%
💨 Max wind: 30.2 km/h
🌧️ Total precip: 2.19 mm
☀️ UV Index: 1
🌅 Sunrise: 06:18 AM
🌇 Sunset: 07:36 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Patchy rain nearby
Patchy rain nearby
25° / 18°
🌧️ 85% chance of rain
💧 Avg. humidity: 90%
💨 Max wind: 32 km/h
🌧️ Total precip: 3.46 mm
☀️ UV Index: 0.8
🌅 Sunrise: 06:16 AM
🌇 Sunset: 07:37 PM
🌙 Waning Crescent
🌑 Moon: 15% lit

Best Time to Visit Janesville

Plan your trip to Janesville, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Janesville 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Janesville?
Current conditions in Janesville: Overcast, temperature 24°C, humidity 61%.
What is the best time to visit Janesville?
The best time to visit Janesville is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Janesville?
Janesville is located at approximately 42.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Janesville?
The wettest period in Janesville is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Janesville?
For visits to Janesville during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Janesville in?
Janesville is located in United States, in the state of Wisconsin.
What are the public holidays in Janesville in 2026?
View the 2026 public holidays for Janesville on our Holidays page.
What are the GPS coordinates used for the weather forecast in Janesville?
The weather forecast for Janesville uses coordinates 42.683, -89.0227.