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Weather · United States

Illinois 15-Day Weather Forecast

  1. TodayOctober 1715° 3°
  2. TomorrowOctober 1818° 3°
  3. MonOctober 1920° 8°
  4. TueOctober 2022° 9°
  5. WedOctober 2122° 10°
  6. ThuOctober 2224° 11°
  7. FriOctober 2325° 13°
  8. SatOctober 2425° 13°
  9. SunOctober 2518° 12°
  10. MonOctober 2621° 11°
  11. TueOctober 2720° 15°
  12. WedOctober 2816° 9°
  13. ThuOctober 2915° 8°
  14. FriOctober 3019° 10°

Over the 15 days from October 17 to October 31, temperatures in Illinois will range from 3°C to 25°C; the warmest day is October 24. Days with rain (1 mm or more) expected: 3. Values beyond day 7 indicate a trend and are updated daily.

Illinois 15-day forecast table

The bar shows each day's range against the period's lowest and highest temperature.

  1. TodayOctober 173°15°14 km/h
  2. TomorrowOctober 183°18°22 km/h
  3. MondayOctober 198°20°12 km/h
  4. TuesdayOctober 209°22°13 km/h
  5. WednesdayOctober 2110°22°12 km/h
  6. ThursdayOctober 2211°24°11 km/h
  7. FridayOctober 2313°25°13 km/h
  8. SaturdayOctober 2413°25°16 km/h
  9. SundayOctober 2512°18°17 km/h
  10. MondayOctober 2611°21°15 km/h
  11. TuesdayOctober 2715°20°17 km/h
  12. WednesdayOctober 2820%9°16°16 km/h
  13. ThursdayOctober 298°15°30 km/h
  14. FridayOctober 3027%10°19°30 km/h
  15. SaturdayOctober 3127%8°14°27 km/h

Frequently asked questions

What will the weather be like in Illinois over the next 15 days?
Over the 15 days from October 17 to October 31, temperatures in Illinois will range from 3°C to 25°C; the warmest day is October 24. Days with rain (1 mm or more) expected: 3. Values beyond day 7 indicate a trend and are updated daily.
How reliable is this forecast?
Values for 15 days ahead show a trend; they are updated as the date approaches and may change.

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