September weather forecast
Nashua, 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 21.2°C and 12.1°C.

Temperature

The onset of September entails a temperature shift, as the average high-temperature decreases from a moderately hot 27.6°C in August to an agreeable 21.2°C. The average nighttime temperature lowers to a cool 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 28mm of precipitation. In Nashua, during the entire year, the rain falls for 90.8 days and collects up to 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.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Nashua in September?
In Nashua, 21.2°C is the average high-temperature and 12.1°C is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, in August is computed to be 27°C.
What is the average humidity in September in Nashua?
The average relative humidity in September is 47%.
How much does it rain in Nashua in September?
In Nashua, Montana, in September, during 9.1 rainfall days, 28mm of precipitation is typically accumulated.
When it does not snow in Nashua?
June through September are months without snowfall in Nashua, Montana.
Does it snow in Nashua in September?
In Nashua, in September, it doesn't snow. In October, it regularly snows.
How many hours of daylight does Nashua have in September?
In September, the average day length is 12h and 34min.
When is the sunrise / sunset in September in Nashua?
On the first day of September in Nashua, Montana, sunrise is at 6:24 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:45 pm MDT.
How many hours of sunshine does Nashua have in September?
The average sunshine duration in September is 10.1h.
What is the UV index intensity in September in Nashua?
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Nashua, MT
Average temperature in September
Nashua, MT
  • Average high temperature in September: 21.2°C

The warmest month (with the highest average high temperature) is July (28.4°C).
The month with the lowest average high temperature is February (-4.6°C).

  • Average low temperature in September: 12.1°C

The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is February (-12.1°C).

Average pressure in September - Nashua, MT
Average pressure in September
Nashua, MT
  • Average pressure in September: 1013.3mbar

The month with the highest atmospheric pressure is February (1021.1mbar).
The month with the lowest atmospheric pressure is June (1010.3mbar).

Average wind speed in September - Nashua, MT
Average wind speed in September
Nashua, MT
  • Average wind speed in September: 16.8km/h

The windiest month (with the highest average wind speed) is April (18.8km/h).
The calmest month (with the lowest average wind speed) is February (14.1km/h).

Average humidity in September - Nashua, MT
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
Nashua, MT
  • Average rainfall in September: 28mm

The wettest month (with the highest rainfall) is June (51mm).
The driest months (with the least rainfall) are January and February (9mm).

Average rainfall days in September - Nashua, MT
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
Nashua, MT
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (66mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - Nashua, MT
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 /
Average sunshine in September
Nashua, MT
  • Average daylight in September: 12h and 4min

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 1min

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
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
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
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
Nashua, MT
  • Average visibility in September: 10km

The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).

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