Island Lake Weather Forecast
- 66
- 89
Mostly Cloudy
- 61
- 83
Chance Thunderstorms
- 63
- 83
Mostly Sunny
- 59
- 83
Chance Thunderstorms
- 57
- 74
Rain Showers Likely
- 54
- 72
Chance Rain Showers
Today 13 Sep McCook
Mostly sunny. Highs in the upper 80s. South Winds 10 to 15 Mph.
Tonight 13 Sep McCook
Mostly cloudy. Lows in the upper 60s. South Winds around 10 Mph.
Island Lake Temperature Statistics
September Temperature
Madison Municipal Airport (14.9 miles)
Lowest 7 September, 2025
35.6 °FAverage September
59.8 °FHighest 11 September, 2025
82.4 °F
Climate (2020–Present)
Madison Municipal Airport (14.9 miles)
Average Low 2020–2025
37.1 °FAverage 2020–2025
47.3 °FAverage High 2020–2025
57.6 °F