Janesville, WI Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Janesville, WI in one place.
Sunny, with a high near 89. South wind around 5 mph.
Local Weather Overview
This forecast page for Janesville, WI is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: May 24, 2026 12:35 PM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for Janesville, WI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 12:35 PM CDT
- Forecast office
- MKX
- Source
- NOAA / NWS
Daily Outlook
This Week in Janesville
Tuesday looks like the warmest upcoming period in Janesville at 89 degrees F.
Friday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Friday at about 5 to 15 mph NE.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 12:35 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- MKX
- Radar station
- KMKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 61. Southeast wind 0 to 5 mph.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Northeast wind 0 to 10 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 58. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.
Mostly sunny, with a high near 82.
Partly cloudy, with a low around 54.
Mostly sunny, with a high near 77.
Partly cloudy, with a low around 52.
Mostly sunny, with a high near 77.
Mostly clear, with a low around 53.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Sunny
|
89°F |
5 mph
S
|
|
Tuesday Night
May 26
|
Partly Cloudy
|
61°F |
0 to 5 mph
SE
|
|
Wednesday
May 27
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
0 to 10 mph
NE
|
|
Wednesday Night
May 27
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
58°F |
5 to 10 mph
NE
|
|
Thursday
May 28
|
Mostly Sunny
|
82°F |
5 to 10 mph
NE
|
|
Thursday Night
May 28
|
Partly Cloudy
|
54°F |
5 to 10 mph
E
|
|
Friday
May 29
|
Mostly Sunny
|
77°F |
5 to 15 mph
NE
|
|
Friday Night
May 29
|
Partly Cloudy
|
52°F |
5 to 10 mph
E
|
|
Saturday
May 30
|
Mostly Sunny
|
77°F |
5 to 10 mph
NE
|
|
Saturday Night
May 30
|
Mostly Clear
|
53°F |
0 to 10 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Janesville.
