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 in Thief River Falls is accompanied by a temperature decrease, with the average high-temperature shifting from a moderately hot 78.4°F (25.8°C) in August to an agreeable 68.9°F (20.5°C). In Thief River Falls, September's nights observe an average temperature dip to a frosty 49.8°F (9.9°C).Humidity
In Thief River Falls, Minnesota, the average relative humidity in September is 67%.Rainfall
In September, in Thief River Falls, Minnesota, the rain falls for 10.4 days. Throughout September, 1.69" (43mm) of precipitation is accumulated. Throughout the year, in Thief River Falls, there are 104.3 rainfall days, and 18.39" (467mm) of precipitation is accumulated.Snowfall
In Thief River Falls, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:43 am and sunset at 8:05 pm. On the last day of September, in Thief River Falls, sunrise is at 7:23 am and sunset at 7:05 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Thief River Falls, Minnesota, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. When the Sun is at its strongest around midday, find shade and limit exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Thief River Falls in September?
What is the average humidity in September in Thief River Falls?
How many days does it rain in September in Thief River Falls?
When it does not snow in Thief River Falls?
Does it snow in Thief River Falls in September?
How many hours of daylight does Thief River Falls have in September?
When are sunrise and sunset in September in Thief River Falls?
How many hours of sunshine does Thief River Falls have in September?
What is the UV index reading in September in Thief River Falls?
Average temperature in September
Thief River Falls, MN
- Average high temperature in September: 68.9°F
The warmest months (with the highest average high temperature) are July and August (78.4°F).
The month with the lowest average high temperature is January (13.8°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (0°F).
Average pressure in September
Thief River Falls, MN
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Thief River Falls, MN
- Average wind speed in September: 9.4mph
The windiest month (with the highest average wind speed) is October (10.1mph).
The calmest month (with the lowest average wind speed) is July (7.9mph).
Average humidity in September
Thief River Falls, MN
- Average humidity in September: 67%
The months with the highest relative humidity are January and February (93%).
The months with the lowest relative humidity are May and August (66%).
Average rainfall in September
Thief River Falls, MN
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is June (3.15").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in September
Thief River Falls, MN
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is June (16.3 days).
The month with the least rainy days is January (1.9 days).
Average snowfall in September
Thief River Falls, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Thief River Falls, MN
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (16.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Thief River Falls, MN
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in September
Thief River Falls, MN
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is August (18.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Thief River Falls, 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
Thief River Falls, MN
- Average cloud cover in September: 33
The months with the most cloud cover are January and February (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Thief River Falls, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Thief River Falls, Minnesota, USA
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