United StatesAverage weather for Montana in September
It's pleasantly warm in September in Montana with an average temperature of 21°C. Temperatures this month range from a low of 16°C to a high of 27°C. At night, you can expect temperatures between 5°C and 11°C.
Start of September
The month of September starts in Montana with warm temps, averaging around 24°C during the day and nights around 10°C. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
Mid September
By mid-September, daytime temps drop to around 21°C, with nights around 9°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Montana is around 20°C, while nighttime temps are about 7°C. A shower might pop up, but overall, the weather will be dry and sunny.
In September, there is an average of 54 mm of precipitation, spread over 8 days. Of the total precipitation, about 2,8 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
Montana in September |
New York | ||
|---|---|---|---|
 Average temperature |
21°C | 27°C | |
 Max. temperature |
27°C | 31°C | |
| Min. temperature |
16°C | -5°C | |
 Total precipitation |
54 mm | 57 mm | |
| Rainy days |
8 days | 9 days | |
 Total snowfall |
2,8 cm | 0 cm | |
| Snowy days |
2 days | 0 days | |
August
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Montana?
Looking for great weather? September is a good time to be in Montana. The temperatures are nice, and there’s not too much rain.
Temperature records
With 40°C in 2022, Montana reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was -3°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of -8°C to a highest value of 18°C.
Check out the climate of Montana for all months and discover the best travel time
The climate in Montana is based on weather data from . Other places, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in Montana to get the full picture of the climate.
Daily Temperature in September in Montana
This chart shows the average daily high and low temperatures in September for Montana, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Montana
The chart below shows the average daily precipitation in September for Montana, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 8 days of precipitation in Montana.
Daily Snowfall in September in Montana
This chart shows the average daily snowfall in September in Montana, measured in centimeters. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in September.
Daily UV index in September in Montana
This chart shows the average daily UV index in September in Montana, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Montana over the years
This chart shows the average temperature in September in Montana, measured in degrees Celsius, over the past few years.
Total precipitation in September in Montana over the years
This chart shows the average precipitation in September in Montana, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Snowfall in September in Montana per year
This chart shows the average snowfall in September in Montana, measured in centimeters, over the past few years.
Daily weather in September for Montana
Click on any day in September to get detailed info about the usual weather on that day in Montana. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Montana
Have you been to Montana in September?
Share your weather experience in September in Montana.
Average weather in Montana by month
Click on a month below to see detailed weather info for Montana. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
