Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The onset of September entails a temperature shift, as the average high-temperature decreases from a moderately hot 79.3°F (26.3°C) in August to an agreeable 68.7°F (20.4°C). Frenchtown's nights during September are marked by a pronounced drop from daytime temperatures, experiencing an average low of 40.6°F (4.8°C).Humidity
In September, the average relative humidity in Frenchtown, Montana, is 58%.Rainfall
In September, the rain falls for 10.6 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Frenchtown, Montana, during the entire year, the rain falls for 162.6 days and collects up to 20.12" (511mm) of precipitation.Snowfall
Months with snowfall in Frenchtown are January through May, September through December. September is the first month it typically snows in Frenchtown. Throughout September, in the average 0.2 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, there are 98.8 snowfall days, and 55.2" (1402mm) of snow is accumulated.Daylight
In September, the average length of the day in Frenchtown is 12h and 32min.On the first day of the month, sunrise is at 6:57 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:17 pm MDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Frenchtown is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 3 in September translates into this advice:
Heed the precautions - It is counselled to guard against solar damage. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. 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.
Frequently asked questions
What is the average September temperature in Frenchtown?
What is the average humidity in September in Frenchtown?
How many days does it rain in September in Frenchtown?
When does it start to snow in Frenchtown?
How many hours of daylight does Frenchtown have in September?
When are sunrise and sunset in September in Frenchtown?
How long on average sun shines in September in Frenchtown?
How high is the UV index in September in Frenchtown?
Average temperature in September
Frenchtown, MT
- Average high temperature in September: 68.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (28°F).
- Average low temperature in September: 40.6°F
The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).
Average pressure in September
Frenchtown, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Frenchtown, MT
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Frenchtown, MT
- Average humidity in September: 58%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are July and August (51%).
Average rainfall in September
Frenchtown, MT
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is April (2.44").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in September
Frenchtown, MT
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is April (20 days).
The months with the least rainy days are July and August (8.4 days).
Average snowfall in September
Frenchtown, MT
- Average snowfall in September: 0.59"
The month with the highest snowfall is February (12.91").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Frenchtown, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (19.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Frenchtown, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Frenchtown, MT
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is July (20.3 days).
The month with the least sunshine days is March (6.6 days).
Average UV index in September
Frenchtown, 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
Frenchtown, MT
- Average cloud cover in September: 24
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Frenchtown, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Frenchtown, Montana, USA
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