The highest day temperature in May 2026 was 89°F. The lowest night temperature was 32°F. The average values for day and night temperatures during May were 67.3°F и 52.5°F respectivly.

The average sea surface temperature in May 2026 for Evanston was 54.7°F. The maximum and minimum values were 50.4°F and 60.2°F respectively.

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

Precipitation total in May for Evanston is 1.5 in. It makes may the most rainy month of the year.

The average wind speed in May is 8.5 mph.

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 Evanston in May is 8.3 hours.