Princeton Rainfall Forecast

Today 28 Sep
No Rain
Tue 29 Sep
No Rain
Wed 30 Sep
45%
Thu 1 Oct
85%
Fri 2 Oct
70%
Sat 3 Oct
30%
Sun 4 Oct
15%

Princeton Rainfall Statistics

September Rainfall

Illinois Valley Regional Airport (16.2 miles)

Total Rainfall 2026
36.5in
Daily Average 2026
0.1in
Wettest Day 1 August, 2026
2.4in
Wet Days 2026
70/271 (26%)
Total Rainfall August
8.8in
Daily Average August
0.3in
Wettest Day 1 August, 2026
2.4in
Wet Days August
15/31 (48%)
Total Rainfall September
2.3in
Daily Average September
0.1in
Wettest Day 19 September, 2026
0.7in
Wet Days September
7/28 (25%)

Climate (2021–2025)

Illinois Valley Regional Airport (16.2 miles)

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Annual Average 2021–2025
34.5in
Monthly Average 2021–2026
3.2in
Daily Average 2021–2026
0.1in
Wettest Day 14 December, 2022
3.4in

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