September weather forecast and climate
Missoula, MT

What is the temperature in September in Missoula?

In Missoula, Montana, in September, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 41.7°F (5.4°C).
Average temperature in September - Missoula, MT
  • Average high temperature in September: 73.1°F

The warmest month (with the highest average high temperature) is July (85.9°F).
The month with the lowest average high temperature is December (31°F).

  • Average low temperature in September: 41.8°F

The month with the highest average low temperature is July (51.4°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).

Average humidity in September - Missoula, MT
  • Average humidity in September: 62.8%

The month with the highest relative humidity is December (83.5%).
The month with the lowest relative humidity is July (51.7%).

Average rainfall in September - Missoula, MT
  • Average rainfall in September: 1.2"

The wettest month (with the highest rainfall) is June (2.1").
The driest month (with the lowest rainfall) is February (0.7").

Average rainfall days in September - Missoula, MT
  • Average rainfall days in September: 8.2 days

Months with the highest number of rainy days are May and December (12.3 days).
The month with the lowest number of rainy days is July (7.1 days).

Average snowfall in September - Missoula, MT
  • Average snowfall in September: 0"

The month with the highest snowfall is December (11").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in September - Missoula, MT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (9.8 days).
Months with the lowest number of snowfall days are July, August and September (0 days).

Average daylight in September / Average sunshine in September - Missoula, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.8h).
The month with shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 8.8h

The month with most sunshine is July (Average sunshine: 12.6h).
The month with least sunshine is December (Average sunshine: 2.7h).

Average UV index in September - Missoula, MT
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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