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Weather in September in Montana

Considering a trip to Montana this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What is the weather like in Montana in September?

Montana is a region in the United States of America. September in Montana generally has temperatures that range from pleasant to warm, with precipitation levels ranging from low to moderate.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is pleasant in Big Sky at 19°C to warm in Hardin at 27°C. Nighttime temperatures generally drop to 8°C in Hardin and 3°C in Big Sky.

Precipitation

In September, precipitation varies across different areas. From low rainfall in Hamilton with an average of 24 mm to moderate rainfall in Big Sky with 46 mm.

For a closer look at September's conditions in Montana, see the map below. For a more detailed look at Montana's yearly weather, check out our Montana climate page.

Where to go in Montana in September

Find more information for the most popular destinations in the Montana on the map below. Click on a destination dot for more detailes.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in September for the 5 most popular destinations in Montana?

Whitefish

In September Whitefish generally has pleasant temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 4°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Whitefish
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
28°C 
8°C 
27 mm 
8 days 
22°C 
4°C 
31 mm 
9 days 
October   >> October
>>  
13°C 
-1°C 
36 mm 
12 days 
Climate in Whitefish

Billings

In September Billings generally has high temperatures with maximum daytime temperatures around 25°C, minimum nighttime temperatures around 8°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Billings
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
31°C 
13°C 
329 hours 
27 mm 
6 days 
25°C 
8°C 
256 hours 
37 mm 
7 days 
October   >> October
>>  
17°C 
2°C 
203 hours 
45 mm 
8 days 
Climate in Billings

Great Falls

In September Great Falls generally has high temperatures with maximum daytime temperatures around 23°C, minimum nighttime temperatures around 7°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Great Falls
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
29°C 
11°C 
328 hours 
31 mm 
7 days 
23°C 
7°C 
255 hours 
35 mm 
7 days 
October   >> October
>>  
15°C 
2°C 
202 hours 
31 mm 
7 days 
Climate in Great Falls

Helena

In September Helena generally has high temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 6°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Helena
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
28°C 
10°C 
324 hours 
28 mm 
9 days 
22°C 
6°C 
254 hours 
34 mm 
9 days 
October   >> October
>>  
14°C 
1°C 
202 hours 
27 mm 
12 days 
Climate in Helena

Red Lodge

In September Red Lodge generally has pleasant temperatures with maximum daytime temperatures around 21°C, minimum nighttime temperatures around 7°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Red Lodge
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
26°C 
11°C 
31 mm 
11 days 
21°C 
7°C 
38 mm 
9 days 
October   >> October
>>  
13°C 
1°C 
59 mm 
11 days 
Climate in Red Lodge

Is your destination not in the list? Have a look at other destinations in Montana, in the United States of America.

Is September the best time to visit Montana?

We believe that September is one of the best times to visit Montana with overall perfect weather in Whitefish. It's worth noting that weather conditions might differ depending on the location you visit.

Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly perfect weather in Whitefish. The weather in January, February, March, November and December, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in Montana. Interested in the weather conditions in a specific month? Select the month below.

  • January      
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  • Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

    Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.