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
The shift from August to September involves a decrease in the average high-temperature, from a pleasant 73°F (22.8°C) to an enjoyable 63.5°F (17.5°C). Despite drastic daily temperature oscillations, McAllister cools down to an average low-temperature of 39.9°F (4.4°C) in September.Humidity
The average relative humidity in September in McAllister, Montana, is 56%.Rainfall
In McAllister, during September, the rain falls for 10.3 days and regularly aggregates up to 1.61" (41mm) of precipitation. In McAllister, during the entire year, the rain falls for 105.7 days and collects up to 17.99" (457mm) of precipitation.Snowfall
January through December are months with snowfall in McAllister. In McAllister, in September, during 3.9 snowfall days, 4.37" (111mm) of snow is typically accumulated. Throughout the year, in McAllister, Montana, there are 136.1 snowfall days, and 86.93" (2208mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:49 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:08 pm MDT.
Sunshine
The average sunshine in September in McAllister is 9.7h.UV index
In McAllister, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 3 during September leads to these instructions:
Take precautions - Protection against sun damage is advised. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in McAllister?
What is the average humidity in September in McAllister?
How much does it rain in McAllister in September?
How many days does it snow in September in McAllister?
What is the average length of the day in September in McAllister?
When is the sunrise / sunset in September in McAllister?
How many hours of sunshine does McAllister have in September?
What is the UV index intensity in September in McAllister?
Average temperature in September
McAllister, MT
- Average high temperature in September: 63.5°F
The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is December (22.3°F).
- Average low temperature in September: 39.9°F
The month with the highest average low temperature is August (46°F).
The coldest month (with the lowest average low temperature) is December (7.7°F).
Average pressure in September
McAllister, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
McAllister, MT
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
McAllister, MT
- Average humidity in September: 56%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
McAllister, MT
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in September
McAllister, MT
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is November (2.9 days).
Average snowfall in September
McAllister, MT
- Average snowfall in September: 4.37"
The month with the highest snowfall is April (14.76").
The month with the least snowfall is August (0.08").
Average snowfall days in September
McAllister, MT
- Average snowfall days in September: 3.9 days
The month with the highest number of snowfall days is April (19.9 days).
The month with the least snowfall days is August (0.3 days).
Average daylight in September /
Average sunshine in September
McAllister, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
McAllister, MT
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is April (6.9 days).
Average UV index in September
McAllister, 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 and February (UV index 1).
Average cloud cover in September
McAllister, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
McAllister, MT
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
McAllister, Montana, USA
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