| National Weather Service Forecast for:
Janesville WI Issued by: National Weather Service Milwaukee, WI |
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| Updated: 3:26 pm CDT Jul 28, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening. |
| Wednesday |
Sunny, with a high near 84. Calm wind becoming west around 5 mph. |
| Wednesday Night |
Mostly clear, with a low around 61. Calm wind. |
| Thursday |
Mostly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon. |
| Thursday Night |
Mostly cloudy, with a low around 64. South wind around 5 mph becoming calm in the evening. |
| Friday |
Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 80. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible. |
| Friday Night |
Showers likely and possibly a thunderstorm. Cloudy, with a low around 64. East wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible. |
| Saturday |
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Northeast wind around 10 mph. |
| Saturday Night |
Partly cloudy, with a low around 61. |
| Sunday |
Mostly sunny, with a high near 81. |
| Sunday Night |
Mostly clear, with a low around 59. |
| Monday |
Sunny, with a high near 83. |
| Monday Night |
Mostly clear, with a low around 62. |
| Tuesday |
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. |
Forecast from NOAA-NWS for Janesville WI.
