Lake Koshkonong Weather Forecast
- 27
- 40
Becoming Sunny
- 23
- 58
Partly Sunny
- 11
- 28
Snow Likely
- 14
- 30
Mostly Cloudy
- 21
- 35
Slight Chance Snow
- 25
- 42
Mostly Cloudy
Today 26 Feb Jefferson
Not as cold. Partly sunny. Highs around 40. Southwest Winds 5 to 10 Mph.
Tonight 26 Feb Jefferson
Not as cold. Mostly clear. Lows in the upper 20s. Southwest Winds 5 to 10 Mph.
Lake Koshkonong Temperature Statistics
February Temperature
Watertown (20.5 miles)
Lowest 4 February, 2026
-5.6 °FAverage February
27.9 °FHighest 16 February, 2026
60.6 °F
Climate (2021–Present)
Watertown (20.5 miles)
Average Low 2021–2026
35.8 °FAverage 2021–2026
45.6 °FAverage High 2021–2026
54.7 °F