Rancho Cucamonga Rainfall Forecast

Today 8 Sep
10%
Wed 9 Sep
10%
Thu 10 Sep
No Rain
Fri 11 Sep
No Rain
Sat 12 Sep
No Rain
Sun 13 Sep
No Rain
Mon 14 Sep
No Rain

Rancho Cucamonga Rainfall Statistics

September Rainfall

Ontario International Airport (3.7 miles)

Total Rainfall 2026
5.6in
Daily Average 2026
0.02in
Wettest Day 1 January, 2026
0.9in
Wet Days 2026
20/251 (8%)
Total Rainfall August
0in
Daily Average August
0in
Wettest Day 1 August, 2026
0in
Wet Days August
–
Total Rainfall September
0.6in
Daily Average September
0.1in
Wettest Day 6 September, 2026
0.6in
Wet Days September
1/8 (13%)

Climate (2021–2025)

Ontario International Airport (3.7 miles)

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

Annual Average 2021–2025
13.5in
Monthly Average 2021–2026
1.1in
Daily Average 2021–2026
0.04in
Wettest Day 5 February, 2024
3.6in

Get WillyWeather+ to remove ads