Lewistown Weather Forecast
- 55
- 75
Chance Thunderstorms
- 56
- 78
Chance Thunderstorms
- 53
- 83
Chance Thunderstorms
- 53
- 80
Chance Thunderstorms
- 53
- 80
Chance Rain Showers
- 52
- 77
Chance Thunderstorms
Today 30 Jul Fergus County below 4500ft
Mostly cloudy early in the morning then becoming partly cloudy. Slight chance of rain Showers early in the Morning, then slight chance of Thunderstorms in the afternoon. Highs 75 to 80. East Winds 5 to 15 Mph. Chance of precipitation 20 percent.
Tonight 30 Jul Fergus County below 4500ft
Partly cloudy. Lows 55 to 60. East Winds 5 to 15 Mph.
Lewistown Temperature Statistics
July Temperature
Lewistown, Lewistown Municipal Airport (1.2 miles)
Lowest 17 July, 2025
43.6 °FAverage July
66 °FHighest 8 July, 2025
93.7 °F
Climate (2020–Present)
Lewistown, Lewistown Municipal Airport (1.2 miles)
Average Low 2020–2025
32.2 °FAverage 2020–2025
44.4 °FAverage High 2020–2025
56.3 °F