Duluth
Minnesota, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Duluth, MN

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  • The average high temperature in September: 65°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (18.9°F).

  • The average low temperature in September: 46.1°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (1.5°F).

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  • The average humidity in September: 75.7%

The month with the highest relative humidity is December (76.3%).
The month with the lowest relative humidity is May (62.7%).

  • The average rainfall in September: 4.1"

The wettest month (with the highest rainfall) is June (4.2").
The driest month (with the lowest rainfall) is February (0.8").

  • The average rainfall days in September: 12.3 days

The month with the highest number of rainy days is June (12.6 days).
The month with the lowest number of rainy days is February (8.5 days).

  • The average snowfall in September: 0.1"

The month with the highest snowfall is January (19.4").
Months with the lowest snowfall are June, July and August (0").

  • The average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is January (12.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

  • The average sea temperature in September: 57°F

The best month for swimming (with the highest average sea temperature) is August (61°F).
Coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in September: 6.5h

The month with most sunshine is July (Average sunshine: 9.9h).
Months with least sunshine are November and December (Average sunshine: 3.3).

  • The average UV index in September: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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