September weather forecastFortine, MT
September
Weather in September
September, the first month of the autumn in Fortine, is also an enjoyable month, with an average temperature varying between 38.7°F (3.7°C) and 65.8°F (18.8°C).Temperature
In September, the average high-temperature goes from a warm 77.2°F (25.1°C) in August to a refreshing 65.8°F (18.8°C). In September, the recorded average low-temperature in Fortine, of 38.7°F (3.7°C), exhibits a significant fall from the daytime highs.Humidity
In September, the average relative humidity in Fortine is 64%.Rainfall
In Fortine, Montana, during September, the rain falls for 8.8 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 136.3 rainfall days, and 15.35" (390mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.28" (7mm) of snow. In Fortine, during the entire year, snow falls for 110.7 days and aggregates up to 46.81" (1189mm) of snow.Daylight
In Fortine, the average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:57 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:19 pm MDT.
Sunshine
In Fortine, the average sunshine in September is 9.1h.UV index
In Fortine, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 3 during September translates into the following guidance:
Take necessary precautions - Defending against sun damage is advocated. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Boost your sun resistance with garments that are densely woven yet spacious. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fortine, MT
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).
- Average low temperature in September: 38.7°F
The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).
Average pressure in September
Fortine, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Fortine, MT
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is June (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).
Average humidity in September
Fortine, MT
- Average humidity in September: 64%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Fortine, MT
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in September
Fortine, MT
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is April (17 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Fortine, MT
- Average snowfall in September: 0.28"
The month with the highest snowfall is February (10").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Fortine, MT
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is December (22.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Fortine, MT
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Fortine, MT
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is August (21.6 days).
The month with the least sunshine days is March (6.3 days).
Average UV index in September
Fortine, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Fortine, MT
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Fortine, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
