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Weather by month

Duluth Weather by Month

Average temperatures, rainfall and humidity for Duluth, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Duluth month looks like before you travel — then check the live Duluth forecast for the days ahead.

Warmest month

July

29°C average high

Coolest month

January

-12°C average low

Wettest month

June

125 mm of rain

Driest month

February

7 mm of rain

Average temperature and rainfall in Duluth by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	-4°C	-12°C	-33°C / 12°C	8 mm	76%	14 km/h
February	-2°C	-11°C	-29°C / 17°C	7 mm	72%	15 km/h
March	6°C	-3°C	-27°C / 26°C	35 mm	67%	16 km/h
April	13°C	3°C	-13°C / 31°C	67 mm	63%	17 km/h
May	21°C	10°C	0°C / 37°C	87 mm	62%	14 km/h
June	27°C	16°C	6°C / 37°C	125 mm	67%	13 km/h
July	29°C	18°C	10°C / 37°C	71 mm	69%	11 km/h
August	27°C	17°C	9°C / 37°C	89 mm	73%	11 km/h
September	24°C	14°C	0°C / 37°C	74 mm	72%	13 km/h
October	15°C	6°C	-9°C / 33°C	65 mm	70%	14 km/h
November	6°C	-2°C	-24°C / 24°C	30 mm	73%	15 km/h
December	-1°C	-8°C	-30°C / 14°C	25 mm	79%	13 km/h

Best time to visit Duluth

The most comfortable time to visit Duluth is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 682 mm a year.

Travellers who prefer heat should aim for July, when highs average 29°C. June is the month to avoid if rain would spoil your plans — it averages 125 mm, roughly 19× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Duluth forecast for what is happening now.