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 start of September comes with a reduction in the average high-temperature, receding from an agreeable 72.1°F (22.3°C) in August to a refreshing 62.8°F (17.1°C). An average nighttime temperature of 41.5°F (5.3°C) is recorded during September.Humidity
In Geyser, the average relative humidity in September is 58%.Rainfall
In Geyser, in September, during 11.2 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, there are 138.1 rainfall days, and 28.58" (726mm) of precipitation is accumulated.Snowfall
January through June, August through December are months with snowfall. In Geyser, during September, snow falls for 2.7 days and regularly aggregates up to 3.82" (97mm) of snow. In Geyser, during the entire year, snow falls for 137.4 days and aggregates up to 110.08" (2796mm) of snow.Daylight
In Geyser, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:42 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:02 pm MDT.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Geyser?
What is the average humidity in September?
How much does it rain in Geyser in September?
How many days does it snow in September in Geyser?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Geyser have in September?
What is the UV index reading in September?
Average temperature in September
Geyser, MT
- Average high temperature in September: 62.8°F
The warmest month (with the highest average high temperature) is July (73.9°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in September: 41.5°F
The months with the highest average low temperature are July and August (48.2°F).
The coldest month (with the lowest average low temperature) is December (11.7°F).
Average pressure in September
Geyser, MT
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Geyser, MT
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Geyser, MT
- Average humidity in September: 58%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (53%).
Average rainfall in September
Geyser, MT
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is May (4.69").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in September
Geyser, MT
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is June (20.9 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Geyser, MT
- Average snowfall in September: 3.82"
The month with the highest snowfall is April (19.29").
The month with the least snowfall is July (0").
Average snowfall days in September
Geyser, MT
- Average snowfall days in September: 2.7 days
The month with the highest number of snowfall days is March (20.3 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Geyser, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Geyser, MT
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is May (4.7 days).
Average UV index in September
Geyser, 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
Geyser, MT
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
Geyser, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is February (4mi).
Geyser, Montana, USA
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