Bozeman

Montana Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Montana, the United States of America in September.

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Whitefish Billings Bozeman Great Falls

Planning a trip to Montana, the United States of America this September? Here's what you need to know about the weather:

What to Expect in Montana in September

Montana, the United States of America 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 (66°F) to warm in Hardin at 27°C (81°F). Nighttime temperatures generally drop to 8°C (46°F) in Hardin and 3°C (37°F) in Big Sky.

To explore the conditions in Montana, the United States of America in more detail, check the map below.

Precipitation

In September, precipitation varies across different areas. From low rainfall in Hamilton with an average of 24 mm (0.9 in) to moderate rainfall in Big Sky with 46 mm (1.8 in).

Explore Montana by month

Pick a month to see the average temperature, rainfall and sunshine in Montana — and find the best time to visit. (based on Whitefish)

January0°C (32°F) February2°C (36°F) March7°C (45°F) April13°C (55°F) May18°C (64°F) June22°C (72°F) This monthJuly29°C (84°F) August28°C (82°F) September22°C (72°F) October13°C (55°F) November4°C (39°F) December-1°C (30°F)
Best Time to Visit Montana →

Best Places to Visit in Montana in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Montana.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Montana

What is the weather like in September for some of the most popular destinations in Montana, the United States of America?

Temperature range in Montana (September)

Precipitation variation in Montana (September)

Whitefish

In September Whitefish generally has pleasant temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 4°C (39°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
28°C (82°F)
22°C (72°F)
13°C (55°F)
Min temperature
8°C (46°F)
4°C (39°F)
-1°C (30°F)
Monthly rainfall
27 mm (1.1 in)
31 mm (1.2 in)
36 mm (1.4 in)
Monthly rainy days
8 days
9 days
12 days
Weather conditions
perfect
perfect
unpleasant
Climate in Whitefish →

Billings

In September Billings generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 8°C (46°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
31°C (88°F)
25°C (77°F)
17°C (63°F)
Min temperature
13°C (55°F)
8°C (46°F)
2°C (36°F)
Monthly sun hours
329 hours
256 hours
203 hours
Monthly rainfall
27 mm (1.1 in)
37 mm (1.5 in)
45 mm (1.8 in)
Monthly rainy days
6 days
7 days
8 days
Weather conditions
perfect
perfect
tolerable
Climate in Billings →

Bozeman

In September Bozeman generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 6°C (43°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
28°C (82°F)
23°C (73°F)
15°C (59°F)
Min temperature
10°C (50°F)
6°C (43°F)
1°C (34°F)
Monthly rainfall
33 mm (1.3 in)
35 mm (1.4 in)
47 mm (1.9 in)
Monthly rainy days
9 days
9 days
11 days
Weather conditions
perfect
perfect
tolerable
Climate in Bozeman →

Great Falls

In September Great Falls generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 7°C (45°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
29°C (84°F)
23°C (73°F)
15°C (59°F)
Min temperature
11°C (52°F)
7°C (45°F)
2°C (36°F)
Monthly sun hours
328 hours
255 hours
202 hours
Monthly rainfall
31 mm (1.2 in)
35 mm (1.4 in)
31 mm (1.2 in)
Monthly rainy days
7 days
7 days
7 days
Weather conditions
perfect
perfect
tolerable
Climate in Great Falls →

Helena

In September Helena generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 6°C (43°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
28°C (82°F)
22°C (72°F)
14°C (57°F)
Min temperature
10°C (50°F)
6°C (43°F)
1°C (34°F)
Monthly sun hours
324 hours
254 hours
202 hours
Monthly rainfall
28 mm (1.1 in)
34 mm (1.3 in)
27 mm (1.1 in)
Monthly rainy days
9 days
9 days
12 days
Weather conditions
perfect
perfect
pleasant
Climate in Helena →

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

Popular cities in September

Day & night temperatures, rainfall and average weather in Montana in September.

City Weather Day temp Night temp Rainfall
Whitefish 22°C (72°F) 4°C (39°F) 31 mm (1.2 in)
Billings 25°C (77°F) 8°C (46°F) 37 mm (1.5 in)
Bozeman 23°C (73°F) 6°C (43°F) 35 mm (1.4 in)
Great Falls 23°C (73°F) 7°C (45°F) 35 mm (1.4 in)
Helena 22°C (72°F) 6°C (43°F) 34 mm (1.3 in)
Red Lodge 21°C (70°F) 7°C (45°F) 38 mm (1.5 in)

Montana weather in September: frequently asked questions

What is the weather like in Montana, the United States of America in September?

Expect perfect weather across Montana, the United States of America in September. The popular destination of Whitefish averages 22°C (72°F) by day and 4°C (39°F) at night during this month.

What is the average temperature in Montana, the United States of America in September?

Daytime temperatures in Whitefish peak at roughly 22°C (72°F) in September, dropping to about 4°C (39°F) overnight.

Does Montana, the United States of America get a lot of rain in September?

Rain is generally moderate to light in Montana, the United States of America during September, with Whitefish averaging close to 31 mm (1.2 in).

Is September a Good Time to Visit Montana, the United States of America?

We believe that September is one of the best times to visit Montana, the United States of America 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.

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.

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