Starved Rock State Park Weather Forecast

Today 24 Sep
- 61
- 72
Mostly Cloudy
Fri 25 Sep
- 52
- 67
Mostly Cloudy
Sat 26 Sep
- 54
- 69
Mostly Cloudy
Sun 27 Sep
- 52
- 69
Partly Sunny
Mon 28 Sep
- 55
- 71
Partly Sunny
Tue 29 Sep
- 62
- 74
Rain Showers Likely

Today 24 Sep
1. 12 am
2. 1 am
3. 2 am
4. 3 am
5. 4 am
6. 5 am
7. 6 am
8. 7 am
9. 8 am
10. 9 am
11. 10 am
12. 11 am
13. 12 pm
14. 1 pm
15. 2 pm
16. 3 pm
17. 4 pm
18. 5 pm
19. 6 pm
20. 7 pm
21. 8 pm
22. 9 pm
23. 10 pm
24. 11 pm
Fri 25 Sep
1. 12 am
2. 1 am
3. 2 am
4. 3 am
5. 4 am
6. 5 am
7. 6 am
8. 7 am
9. 8 am
10. 9 am
11. 10 am
12. 11 am
13. 12 pm
14. 1 pm
15. 2 pm
16. 3 pm
17. 4 pm
18. 5 pm
19. 6 pm
20. 7 pm
21. 8 pm
22. 9 pm
23. 10 pm
24. 11 pm
Sat 26 Sep
1. 12 am
2. 1 am
3. 4 am
4. 7 am
5. 10 am
6. 1 pm
7. 4 pm
8. 7 pm
Sun 27 Sep
1. 1 am
2. 7 am
3. 1 pm
4. 7 pm
Mon 28 Sep
1. 1 am
2. 7 am
3. 1 pm
4. 7 pm
Tue 29 Sep
1. 1 am
2. 7 am
3. 1 pm
4. 7 pm
Wed 30 Sep
1. 1 am
2. 7 am
3. 1 pm
4. 7 pm

Today 24 Sep La Salle

Mostly cloudy. Near steady temperature in the upper 60s. East Winds around 5 Mph.

Tonight 24 Sep La Salle

Mostly cloudy. Isolated Sprinkles late. Lows in the lower 60s. East Winds around 5 Mph.

Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

Lowest 23 January, 2026
-7.6 °F
Average 2026
57.1 °F
Highest 2 July, 2026
93.2 °F
Lowest 23 August, 2026
55.4 °F
Average August
73 °F
Highest 31 August, 2026
91.4 °F
Lowest 14 September, 2026
50 °F
Average September
72.5 °F
Highest 1 September, 2026
93.2 °F

Climate (2021–2026)

Illinois Valley Regional Airport (7.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

Average Low 2021–2026
43.3 °F
Average 2021–2026
52.9 °F
Average High 2021–2026
62.6 °F

Get WillyWeather+ to remove ads

Starved Rock State Park Weather Forecast

Today 24 Sep La Salle

Tonight 24 Sep La Salle

Fri 25 Sep La Salle

Fri 25 Sep La Salle

Sat 26 Sep La Salle

Sat 26 Sep La Salle

Sun 27 Sep La Salle

Sun 27 Sep La Salle

Mon 28 Sep La Salle

Mon 28 Sep La Salle

Tue 29 Sep La Salle

Tue 29 Sep La Salle

Wed 30 Sep La Salle

Temperature Forecast NOAA

Temperature Real-Time

Chicago Radar

National Satellite

National Synoptic

Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

Lowest 23 January, 2026

Average 2026

Highest 2 July, 2026

Lowest 23 August, 2026

Average August

Highest 31 August, 2026

Lowest 14 September, 2026

Average September

Highest 1 September, 2026

Climate (2021–2026)

Illinois Valley Regional Airport (7.5 miles)

Average Low 2021–2026

Average 2021–2026

Average High 2021–2026