The highest day temperature in September 2026 was 105°F. The lowest night temperature was 56°F. The average values for day and night temperatures during September were 77.7°F и 67.0°F respectivly.

The average sea surface temperature in September 2026 for Oak Park was 69.8°F. The maximum and minimum values were 64.6°F and 76.6°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Oak Park is 0.8 in.

The average wind speed in September is 7.0 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 Oak Park in September is 8.2 hours.