The highest day temperature in May 2026 was 78°F. The lowest night temperature was 32°F. The average values for day and night temperatures during May were 53.8°F и 44.1°F respectivly.

The average sea surface temperature in May 2026 for Duluth was 41.8°F. The maximum and minimum values were 35.6°F and 47.2°F respectively.

You can expect various weather conditions during May. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in May for Duluth is 0.9 in.

The average wind speed in May is 7.7 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Duluth in May is 8.4 hours.