September weather forecastVandalia, MT
September
Weather in September
September, the first month of the autumn in Vandalia, is also an agreeable month, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 53.8°F (12.1°C).Temperature
September suggests a modest reduction in the average high-temperature, shifting from a moderately hot 81.7°F (27.6°C) in August to an agreeable 70.2°F (21.2°C). In September, the recorded average low-temperature in Vandalia is a cool 53.8°F (12.1°C).Humidity
In September, the average relative humidity is 47%.Rainfall
In Vandalia, Montana, in September, it is raining for 9.1 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 90.8 rainfall days, and 11.1" (282mm) of precipitation is accumulated.Snowfall
In Vandalia, snow does not fall in June through September.Daylight
In Vandalia, the average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:26 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:47 pm MDT.
Sunshine
The average sunshine in September in Vandalia is 10.1h.UV index
The average daily maximum UV index in September in Vandalia is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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
Vandalia, 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).
