September weather forecast and climate
Boulder, MT

What is the average temperature in September in Boulder?

The average high-temperature, in September, is 71.1°F (21.7°C), while the average low-temperature is 37°F (2.8°C).
Average temperature in September - Boulder, MT
  • Average high temperature in September: 71°F

Warmest months (with the highest average high temperature) are July and August (82°F).
The month with the lowest average high temperature is January (33°F).

  • Average low temperature in September: 37°F

The month with the highest average low temperature is July (48°F).
The coldest month (with the lowest average low temperature) is January (9°F).

Average rainfall in September - Boulder, MT
  • Average rainfall in September: 1.1"

The wettest month (with the highest rainfall) is June (2.1").
The driest month (with the lowest rainfall) is February (0.3").

Average daylight in September - Boulder, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).

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