September weather forecastWhitlash, MT
September
Weather in September
September, the first month of the autumn in Whitlash, is still a pleasant month, with an average temperature varying between 70°F (21.1°C) and 51.6°F (10.9°C).Temperature
During Whitlash's transition into September, the average high-temperature lessens, moving from a moderately hot 81°F (27.2°C) in August to an agreeable 70°F (21.1°C). Whitlash throughout September, experiences an average nighttime temperature of 51.6°F (10.9°C).Humidity
In September, the average relative humidity is 45%.Rainfall
In Whitlash, in September, it is raining for 6.6 days, with typically 0.63" (16mm) of accumulated precipitation. In Whitlash, during the entire year, the rain falls for 77.5 days and collects up to 6.5" (165mm) of precipitation.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 0.55" (14mm) of snow. Throughout the year, there are 38 snowfall days, and 8.78" (223mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:42 am and sunset at 8:06 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:05 pm MDT.
Sunshine
In Whitlash, the average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Whitlash, MT
- Average high temperature in September: 70°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is December (27.9°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is August (60.3°F).
The coldest months (with the lowest average low temperature) are February and December (16.2°F).
Average pressure in September
Whitlash, MT
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Whitlash, MT
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).
Average humidity in September
Whitlash, MT
- Average humidity in September: 45%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Whitlash, MT
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is June (1.54").
The driest months (with the least rainfall) are January and December (0.16").
Average rainfall days in September
Whitlash, MT
- Average rainfall days in September: 6.6 days
The month with the highest number of rainy days is May (12.4 days).
The months with the least rainy days are January and February (2.1 days).
Average snowfall in September
Whitlash, MT
- Average snowfall in September: 0.55"
The month with the highest snowfall is April (1.65").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Whitlash, MT
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is December (6.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Whitlash, 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 54min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Whitlash, MT
- Average sunshine days in September: 21.4 days
The months with the most sunshine days are January and December (23.9 days).
The months with the least sunshine days are May and June (16.3 days).
Average UV index in September
Whitlash, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Whitlash, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Whitlash, 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).
