September weather forecastCorwin Springs, MT
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Corwin Springs, Montana, with an average temperature varying between 63.5°F (17.5°C) and 39.6°F (4.2°C).Temperature
Transition from August to September is accompanied by a temperature drop, with average high-temperatures decreasing from a pleasant 72.7°F (22.6°C) to an enjoyable 63.5°F (17.5°C). Corwin Springs observes a distinct decrease from peak daytime temperatures, with an average low-temperature of 39.6°F (4.2°C) throughout the month of September.Humidity
In September, the average relative humidity is 57%.Rainfall
In Corwin Springs, during September, the rain falls for 11.1 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Corwin Springs, during the entire year, the rain falls for 116.1 days and collects up to 23.5" (597mm) of precipitation.Snowfall
Months with snowfall are January through December. In Corwin Springs, Montana, in September, during 3.6 snowfall days, 5.04" (128mm) of snow is typically accumulated. In Corwin Springs, during the entire year, snow falls for 151.6 days and aggregates up to 124.06" (3151mm) of snow.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:59 pm. On the last day of September, in Corwin Springs, sunrise is at 7:21 am and sunset at 7:04 pm MDT.
Sunshine
In September, the average sunshine is 9.8h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 3 in September transforms into this advice:
Prioritize safety - Recommendations to avert sunburn are shared. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Corwin Springs, MT
- Average high temperature in September: 63.5°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).
- Average low temperature in September: 39.6°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 (7.9°F).
Average pressure in September
Corwin Springs, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Corwin Springs, MT
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Corwin Springs, MT
- Average humidity in September: 57%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
Corwin Springs, MT
- Average rainfall in September: 1.81"
The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").
Average rainfall days in September
Corwin Springs, MT
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Corwin Springs, MT
- Average snowfall in September: 5.04"
The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").
Average snowfall days in September
Corwin Springs, MT
- Average snowfall days in September: 3.6 days
The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).
Average daylight in September /
Average sunshine in September
Corwin Springs, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 48min
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
Corwin Springs, MT
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).
Average UV index in September
Corwin Springs, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Corwin Springs, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).
Average visibility in September
Corwin Springs, MT
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
