September weather forecastSaint Marie, MT
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Saint Marie, Montana, with an average temperature varying between 53.8°F (12.1°C) and 70.2°F (21.2°C).Temperature
September is characterized by a reduction in the average high-temperature, from a moderately hot 81.7°F (27.6°C) in August to an agreeable 70.2°F (21.2°C). During the nights in September, the temperature in Saint Marie averages to a fresh 53.8°F (12.1°C).Humidity
The average relative humidity in September is 47%.Rainfall
In September, the rain falls for 9.1 days. Throughout September, 1.1" (28mm) of precipitation is accumulated. In Saint Marie, during the entire year, the rain falls for 90.8 days and collects up to 11.1" (282mm) of precipitation.Snowfall
In Saint Marie, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:46 pm. On the last day of September, in Saint Marie, sunrise is at 7:05 am and sunset at 6:46 pm MDT.
Sunshine
In September, the average sunshine is 10.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Marie, MT
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is February (23.7°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is February (10.2°F).
Average pressure in September
Saint Marie, MT
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Saint Marie, MT
- Average wind speed in September: 10.4mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is February (8.8mph).
Average humidity in September
Saint Marie, MT
- Average humidity in September: 47%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Saint Marie, MT
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and February (0.35").
Average rainfall days in September
Saint Marie, MT
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Saint Marie, MT
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.6").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Marie, MT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Saint Marie, MT
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 10h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Saint Marie, MT
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (13.8 days).
Average UV index in September
Saint Marie, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Saint Marie, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in September
Saint Marie, MT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
