Old Agency Weather Forecast
- 46
- 69
Rain Likely
- 47
- 76
Rain Likely
- 45
- 75
Rain
- 42
- 67
Rain Showers
- 42
- 73
Partly Sunny
- 45
- 79
Mostly Sunny
- 47
- 82
Partly Sunny
Today 4 Sep Flathead/Mission Valleys
Mostly cloudy. Areas of rain early in the morning. Slight chance of rain early in the afternoon. Patchy fog early in the morning. Chance of rain 50 percent. Highs in the 60s.
Tonight 4 Sep Flathead/Mission Valleys
Partly cloudy early in the Evening, then mostly cloudy with a slight chance of rain late in the evening. Mostly cloudy after Midnight, then cloudy with a slight chance of rain late in the night. Patchy fog late in the night. Chance of rain 20 percent. Lows in the 40s.
Old Agency Temperature Statistics
September Temperature
Missoula, Missoula International Airport (29.2 miles)
Lowest 1 September, 2026
45.6 °FAverage September
61.9 °FHighest 1 September, 2026
88.6 °F
Climate (2021–2026)
Missoula, Missoula International Airport (29.2 miles)
Average Low 2021–2026
36 °FAverage 2021–2026
47.6 °FAverage High 2021–2026
59.8 °F