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 transition into September is accompanied by a temperature decrease, with the average high-temperature shifting from a moderately hot 78.3°F (25.7°C) in August to a pleasant 68.5°F (20.3°C). September witnesses an average low-temperature hovering around a chilly 47.1°F (8.4°C).Humidity
In Garneill, Montana, the average relative humidity in September is 50%.Rainfall
In Garneill, Montana, during September, the rain falls for 8.3 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, in Garneill, there are 128.6 rainfall days, and 12.8" (325mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Garneill. September is the first month it typically snows in Garneill. Throughout September, in the average 0.6 snowfall days, it receives 1.06" (27mm) of snow. In Garneill, during the entire year, snow falls for 72.8 days and aggregates up to 33.5" (851mm) of snow.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:57 pm. On the last day of September, in Garneill, sunrise is at 7:17 am and sunset at 6:59 pm MDT.
Sunshine
The average sunshine in September in Garneill is 10.3h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Garneill?
What is the average humidity in September in Garneill?
How many days does it rain in September in Garneill?
When does it start to snow in Garneill?
What is the average length of the day in September in Garneill?
What time are sunrise and sunset in September in Garneill?
How many hours of sunshine does Garneill have in September?
What is the UV index reading in September in Garneill?
Average temperature in September
Garneill, MT
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in September: 47.1°F
The months with the highest average low temperature are July and August (54.3°F).
The coldest month (with the lowest average low temperature) is February (16.3°F).
Average pressure in September
Garneill, 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
Garneill, MT
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Garneill, MT
- Average humidity in September: 50%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
Garneill, MT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in September
Garneill, MT
- Average rainfall days in September: 8.3 days
The month with the highest number of rainy days is May (18.7 days).
The months with the least rainy days are January and December (7.2 days).
Average snowfall in September
Garneill, MT
- Average snowfall in September: 1.06"
The month with the highest snowfall is April (6.61").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Garneill, MT
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is February (14.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Garneill, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
Garneill, MT
- Average sunshine days in September: 19.2 days
The month with the most sunshine days is September (19.2 days).
The month with the least sunshine days is April (9 days).
Average UV index in September
Garneill, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Garneill, MT
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Garneill, 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).
Garneill, Montana, USA
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