Montana, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Boulder, MT

The first month of the autumn, Septiembre, is still a pleasant month in Boulder, Montana, with average temperature varying between 71.1°F (21.7°C) and 37°F (2.8°C).


In Septiembre, the average high-temperature drops, from a warm 82°F (27.8°C) in Agosto, to an agreeable 71.1°F (21.7°C). The average low-temperature, in Septiembre, is 37°F (2.8°C).


Throughout Septiembre, in Boulder, 1.1" (27.9mm) of precipitation is accumulated. Throughout the year, 11.3" (286.9mm) of rain is accumulated.


In Boulder, Montana, the average length of the day in Septiembre is 12.5h.

What is the temperature in Septiembre in Boulder?

The average high-temperature, in Septiembre, in Boulder, is 71.1°F (21.7°C), while the average low-temperature is 37°F (2.8°C).

How much does it rain in Boulder in Septiembre?

Throughout Septiembre, in Boulder, Montana, 1.1" (27.9mm) of precipitation is accumulated.

How many hours of daylight does Boulder have in Septiembre?

In Septiembre, the average length of the day in Boulder is 12.5h.
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).