Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August transitions to September, the average high-temperature falls from an agreeable 72°F (22.2°C) to a refreshing 61°F (16.1°C). A pronounced dip becomes evident during the nights in September as Starr School logs a consistent average temperature of 37.8°F (3.2°C).Humidity
In Starr School, the average relative humidity in September is 64%.Rainfall
In Starr School, in September, it is raining for 8.8 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, there are 118.6 rainfall days, and 20.75" (527mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1.2 snowfall days, it receives 1.02" (26mm) of snow. Throughout the year, there are 128.7 snowfall days, and 92.13" (2340mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:50 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:12 pm MDT.
Sunshine
The average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 3 during September translates into the following guidance:
Undertake protective steps - Recommendations to avoid sunburn are issued. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Starr School, MT
- Average high temperature in September: 61°F
The warmest month (with the highest average high temperature) is July (73°F).
The month with the lowest average high temperature is December (23.2°F).
- Average low temperature in September: 37.8°F
The months with the highest average low temperature are July and August (44.2°F).
The coldest month (with the lowest average low temperature) is February (10.9°F).
Average pressure in September
Starr School, MT
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Starr School, MT
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is November (7mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Starr School, MT
- Average humidity in September: 64%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (56%).
Average rainfall in September
Starr School, MT
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is January (2.56").
The driest month (with the least rainfall) is August (0.71").
Average rainfall days in September
Starr School, MT
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Starr School, MT
- Average snowfall in September: 1.02"
The month with the highest snowfall is January (20.16").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Starr School, MT
- Average snowfall days in September: 1.2 days
The month with the highest number of snowfall days is December (22.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Starr School, MT
- Average daylight in September: 12h and 4min
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 24min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Starr School, MT
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is August (19.6 days).
The month with the least sunshine days is February (7.2 days).
Average UV index in September
Starr School, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Starr School, MT
- Average cloud cover in September: 27
The month with the most cloud cover is January (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 17).
Average visibility in September
Starr School, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Starr School, Montana, USA
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