Thief River Falls
Minnesota, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Thief River Falls, MN

The first month of the autumn, September, is still a pleasant month in Thief River Falls, Minnesota, with average temperature ranging between max 68°F (20°C) and min 42.8°F (6°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 78.8°F (26°C) in August, to a pleasant 68°F (20°C). In September, in Thief River Falls, Minnesota, the average low-temperature is 42.8°F (6°C).

Rainfall

In Thief River Falls, during 9 rainfall days, 2.4" (60mm) of precipitation is typically accumulated. In Thief River Falls, during the entire year, the rain falls for 101 days and collects up to 20.6" (522mm) of precipitation.

Daylight

In September, the average length of the day is 12.6h.

Sunshine

The average sunshine in Thief River Falls, Minnesota, is 7h.

UV index

The average daily maximum UV index in Thief River Falls is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Thief River Falls?

In Thief River Falls, Minnesota, in September, the average high-temperature is 68°F (20°C), and the average low-temperature is 42.8°F (6°C).

How many days does it rain in September in Thief River Falls?

In Thief River Falls, in September, it is raining for 9 days, with typically 2.4" (60mm) of accumulated precipitation.

How many hours of daylight does Thief River Falls have in September?

In September, the average length of the day in Thief River Falls is 12.6h.

How many hours of sunshine does Thief River Falls have in September?

In September, the average sunshine in Thief River Falls, Minnesota, is 7h.

What is the UV index reading in September in Thief River Falls?

In September, the average daily maximum UV index in Thief River Falls, Minnesota, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Thief River Falls, MN
  • Average high temperature in September: 68°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (12°F).

  • Average low temperature in September: 43°F

The month with the highest average low temperature is July (55°F).
The coldest month (with the lowest average low temperature) is January (-8°F).

Average rainfall in September - Thief River Falls, MN
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is June (3.6").
The driest month (with the lowest rainfall) is February (0.4").

Average rainfall days in September - Thief River Falls, MN
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is June (11 days).
Months with the lowest number of rainy days are February and November (6 days).

Average daylight in September / Average sunshine in September - Thief River Falls, MN
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 7h

The month with most sunshine is July (Average sunshine: 11h).
Months with least sunshine are November and December (Average sunshine: 3).

Average UV index in September - Thief River Falls, MN
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, February, November and December (UV index 1).