Oak Brook Weather in September

In Oak Brook, September brings high daytime temperatures around 25°C (77°F), with nights cooling to 13°C (55°F). Expect quite a bit of rainfall this month.

Rainfall in Oak Brook in September

Past climate data indicates that roughly 10 days will see rain, totalling around 87 mm (3.4 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Oak Brook in September

The excellent temperature in Oak Brook in September makes it a solid month to visit, with 25°C (77°F) during the day and 13°C (55°F) at night. This kind of day-to-night contrast is typical for this time of year. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Oak Brook in September

Enjoy a sunny month with about 226 hours of sunshine, the clear skies make Oak Brook even more beautiful.

Wind Speed in Oak Brook in September

In September, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

If your ideal day consists of dry skies and pleasant temperatures, September typically offers the best circumstances for Oak Brook.