September weather forecastMelville, MT
September
Weather in September
September, the first month of the autumn in Melville, is still a comfortable month, with an average temperature varying between 66.7°F (19.3°C) and 45.3°F (7.4°C).Temperature
The transition into September indicates a reduction in the average high-temperature, down to a comfortable 66.7°F (19.3°C) from August's moderately hot 76.6°F (24.8°C). The average temperature drops to a frosty 45.3°F (7.4°C) during the night in the month of September.Humidity
In September, the average relative humidity is 51%.Rainfall
In Melville, during September, the rain falls for 9.8 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 129.6 rainfall days, and 15.83" (402mm) 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 1 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.Daylight
The average length of the day in September in Melville is 12h and 31min.On the first day of September, sunrise is at 6:41 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:01 pm MDT.
Sunshine
In September, the average sunshine is 10.2h.UV index
The average daily maximum UV index in September in Melville is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Heed the precautions - It is counselled to guard against solar damage. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Melville, MT
- Average high temperature in September: 66.7°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in September: 45.3°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure in September
Melville, MT
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Melville, MT
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Melville, MT
- Average humidity in September: 51%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Melville, MT
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Melville, MT
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).
Average snowfall in September
Melville, MT
- Average snowfall in September: 0.51"
The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Melville, MT
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Melville, 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 12min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).
Average sunshine days in September
Melville, MT
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).
Average UV index in September
Melville, 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, March, April, October, November and December (UV index 2).
Average cloud cover in September
Melville, MT
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Melville, 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).
