September weather forecastTownsend, MT
September
Weather in September
September in Townsend, Montana signals the arrival of autumn, bringing a shift in weather patterns noticeable from the preceding month of August. A noticeable decrease in temperatures from the preceding month to a maximum of 68.5°F (20.3°C), indicates the beginning of the cool season. While the nights start to get chillier, the days continue to be warm, offering a balancing act between the departing summer and incoming autumn. It's a period of transition, with early signs of winter peeking through as evidenced by the reappearance of snowfall at 1.26" (32mm). Heading into October, the weather takes a decisive turn toward colder conditions, marking the definitive end of summer.Temperature
As September begins in Townsend, there is a decrease in the average high-temperature, falling from a warm 79°F (26.1°C) in August to a pleasant 68.5°F (20.3°C). Townsend's average low-temperature of 43.3°F (6.3°C) in September reflects a significant disparity from the daytime highs.Humidity
In Townsend, Montana, the average relative humidity in September is 52%.Rainfall
In Townsend, in September, it is raining for 7.9 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 117.5 rainfall days, and 10.24" (260mm) 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 1.26" (32mm) of snow. In Townsend, Montana, during the entire year, snow falls for 72.8 days and aggregates up to 26.22" (666mm) of snow.Daylight
The average length of the day in September is 12h and 32min.On the first day of September in Townsend, sunrise is at 6:47 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:07 pm MDT.
Sunshine
In September, the average sunshine is 10h.UV index
The average daily maximum UV index in September in Townsend is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 3 suggests this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Townsend, MT
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 43.3°F
The months with the highest average low temperature are July and August (49.3°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).
Average pressure in September
Townsend, MT
- Average pressure in September: 29.97"Hg
The months with the highest atmospheric pressure are January and December (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Townsend, MT
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is December (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Townsend, MT
- Average humidity in September: 52%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Townsend, MT
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is June (1.65").
The driest month (with the least rainfall) is December (0.51").
Average rainfall days in September
Townsend, MT
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is April (14.7 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in September
Townsend, MT
- Average snowfall in September: 1.26"
The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Townsend, MT
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is February (15.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Townsend, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Townsend, MT
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is August (19.6 days).
The month with the least sunshine days is April (10.5 days).
Average UV index in September
Townsend, 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 February and December (UV index 1).
Average cloud cover in September
Townsend, MT
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
Townsend, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
