McCartney Lake Weather Forecast
- 72
- 91
Chance Thunderstorms
- 67
- 89
Chance Thunderstorms
- 59
- 78
Chance Rain Showers
- 56
- 77
Mostly Sunny
- 55
- 77
Mostly Sunny
- 56
- 77
Partly Sunny
Today 28 Jul Grant
Mostly sunny. Hot with Highs in the lower 90s. North Winds 5 to 10 Mph, becoming northwest this afternoon. Heat index Values up to 100 this afternoon.
Tonight 28 Jul Grant
Mostly clear with a chance of Showers with a slight chance of Thunderstorms in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows around 70. South Winds around 5 Mph, becoming north after midnight. Chance of rain 50 percent. Heat index Values up to 100 early in the evening.
McCartney Lake Temperature Statistics
July Temperature
Dubuque Regional Airport (21.1 miles)
Lowest 13 July, 2025
59.6 °FAverage July
74.7 °FHighest 4 July, 2025
91.7 °F
Climate (2020–Present)
Dubuque Regional Airport (21.1 miles)
Average Low 2020–2025
40.3 °FAverage 2020–2025
49.6 °FAverage High 2020–2025
58.9 °F