| NWS Forecast for: Janesville WI Issued by: National Weather Service Milwaukee, WI Last Update: 6:41 am CDT May 21, 2026 | |
Today: A slight chance of sprinkles after 10am. Mostly cloudy, with a high near 59. East wind 10 to 15 mph. Tonight: Mostly cloudy, with a low around 45. East wind around 10 mph. Friday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 65. East wind 10 to 15 mph. Friday Night: Showers likely, mainly after 1am. Cloudy, with a low around 50. East wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible. Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 73. Northeast wind around 5 mph becoming northwest in the afternoon. Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Northwest wind around 5 mph becoming calm in the evening. Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%. Sunday Night: Mostly clear, with a low around 53. Northwest wind around 5 mph becoming calm. Memorial Day: Mostly sunny, with a high near 82. Monday Night: Mostly clear, with a low around 56. Tuesday: Mostly sunny, with a high near 84. Tuesday Night: A 30 percent chance of showers. Partly cloudy, with a low around 59. Wednesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. | |
| Janesville WI 42.67°N 89.04°W (Elev. 774 ft) | |
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