September weather forecastNashua, MT
September
Weather in September
September, the first month of the autumn in Nashua, is still a pleasant month, with an average temperature varying between 70.2°F (21.2°C) and 53.8°F (12.1°C).Temperature
The onset of September entails a temperature shift, as the average high-temperature decreases from a moderately hot 81.7°F (27.6°C) in August to an agreeable 70.2°F (21.2°C). The average nighttime temperature lowers to a cool 53.8°F (12.1°C) throughout September.Humidity
In September, the average relative humidity in Nashua is 47%.Rainfall
In Nashua, during September, the rain falls for 9.1 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Nashua, during the entire year, the rain falls for 90.8 days and collects up to 11.1" (282mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:45 pm MDT.
Sunshine
The average sunshine in September in Nashua is 10.1h.UV index
The average daily maximum UV index in September in Nashua, Montana, is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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
Nashua, 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).
