Olsons Bay Weather Forecast
- 66
- 89
Chance Thunderstorms
- 60
- 82
Mostly Sunny
- 63
- 85
Mostly Sunny
- 66
- 86
Mostly Cloudy
- 65
- 81
Chance Rain Showers
- 63
- 83
Chance Rain Showers
Today 27 Jul Jefferson
Warm and humid. Partly sunny. Light Showers likely and chance of Thunderstorms in the Morning, then chance of light Showers and Thunderstorms in the late morning and afternoon. Highs in the upper 80s. Southwest Winds 5 to 15 Mph. Chance of precipitation 70 percent. Highest heat index Readings 97 to 102 in the late morning and afternoon.
Tonight 27 Jul Jefferson
Partly cloudy. A 20 percent chance of light Showers and Thunderstorms in the evening. Lows in the mid 60s. North Winds 5 to 10 Mph. Highest heat index Readings 95 to 96 in the evening.
Olsons Bay Temperature Statistics
July Temperature
Janesville-Rock County (17.4 miles)
Lowest 22 July, 2026
50 °FAverage July
74.3 °FHighest 14 July, 2026
95 °F
Climate (2021–2026)
Janesville-Rock County (17.4 miles)
Average Low 2021–2026
40.3 °FAverage 2021–2026
48.7 °FAverage High 2021–2026
60.4 °F