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 commencement of September involves a temperature shift, with the average high-temperature dropping from 83.3°F (28.5°C) in August to a still warm 73.8°F (23.2°C). In Stacey, the average temperature during the nights of September drops to a fresh 53.2°F (11.8°C).Humidity
The average relative humidity in September in Stacey is 45%.Rainfall
In September, in Stacey, the rain falls for 10.3 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Stacey, during the entire year, the rain falls for 113.9 days and collects up to 14.84" (377mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. In Stacey, during the entire year, snow falls for 55.2 days and aggregates up to 23.5" (597mm) of snow.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:25 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:44 pm MDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A daily high UV index of 4 in September leads to these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Stacey?
What is the average humidity in September in Stacey?
How many days does it rain in September in Stacey?
When does it start snowing in Stacey?
How many hours of daylight does Stacey have in September?
When is the sunrise / sunset in September in Stacey?
How long on average sun shines in September in Stacey?
What is the UV index intensity in September in Stacey?
Average temperature in September
Stacey, MT
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in September
Stacey, MT
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Stacey, MT
- Average wind speed in September: 8.4mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).
Average humidity in September
Stacey, MT
- Average humidity in September: 45%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Stacey, MT
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in September
Stacey, MT
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Stacey, MT
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (4.33").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Stacey, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (10.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Stacey, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- 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: 5h and 0min).
Average sunshine days in September
Stacey, MT
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Stacey, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover in September
Stacey, MT
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Stacey, 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).
Stacey, Montana, USA
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