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 advent of September brings a slight shift in average high-temperature, moving from a moderately hot 77.5°F (25.3°C) in August to an agreeable 70.5°F (21.4°C). In the month of September, the average temperature dips to a fresh 52.2°F (11.2°C) during the night.Humidity
The average relative humidity in September in Stillwater is 76%.Rainfall
In Stillwater, in September, during 12.9 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Stillwater, Minnesota, during the entire year, the rain falls for 121.8 days and collects up to 21.38" (543mm) of precipitation.Snowfall
In Stillwater, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Stillwater, sunrise is at 6:34 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:52 pm CDT.
Sunshine
In September, the average sunshine in Stillwater is 8.6h.UV index
The average daily maximum UV index in September in Stillwater is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Stillwater?
What is the average humidity in September in Stillwater?
How much does it rain in Stillwater in September?
When it does not snow in Stillwater?
Does it snow in Stillwater in September?
How many hours of daylight does Stillwater have in September?
When are sunrise and sunset in September in Stillwater?
How many hours of sunshine does Stillwater have in September?
What is the UV index intensity in September in Stillwater?
Average temperature in September
Stillwater, MN
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (19.4°F).
- Average low temperature in September: 52.2°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (6.6°F).
Average pressure in September
Stillwater, MN
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Stillwater, MN
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).
Average humidity in September
Stillwater, MN
- Average humidity in September: 76%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Stillwater, MN
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Stillwater, MN
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is June (17 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Stillwater, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Stillwater, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Stillwater, MN
- 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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Stillwater, MN
- Average sunshine days in September: 15 days
The month with the most sunshine days is October (17 days).
The month with the least sunshine days is June (10.1 days).
Average UV index in September
Stillwater, MN
- 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, November and December (UV index 1).
Average cloud cover in September
Stillwater, MN
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Stillwater, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Stillwater, Minnesota, USA
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