Average annual temperature is 17.6 °C
Absolute maximum temperature: 40.3 °C
Absolute minimum temperature: -0.2 °C
Number of sunny days: 265 days
Number of rainy days: 100 days
Look at detailed online map of Rancho Cucamonga
* Weather data for Rancho Cucamonga United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 19.2 | 21.7 | 20.3 | 32.5 | 30.6 | 36.1 | 40.2 | 40.3 | 36.8 | 36.2 | 28.8 | 25.2 |
| Average daytime temperature (°C) | 14.3 | 15.5 | 15.3 | 23.5 | 23.9 | 26.4 | 35.9 | 34.0 | 28.8 | 27.8 | 22.3 | 19.2 |
| Average temperature (°C) | 10.1 | 9.8 | 10.4 | 16.0 | 17.0 | 18.8 | 28.2 | 26.9 | 22.1 | 20.9 | 16.3 | 13.9 |
| Average night temperature (°C) | 7.1 | 5.7 | 7.3 | 11.0 | 12.5 | 13.9 | 22.6 | 21.7 | 17.8 | 15.9 | 11.8 | 9.9 |
| Absolute minimum temperature (°C) | 3.1 | -0.2 | 2.0 | 2.2 | 7.4 | 11.3 | 15.2 | 16.1 | 14.0 | 9.9 | 5.2 | 6.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.5 | 7.8 | 7.5 | 11.3 | 11.9 | 12.3 | 13.1 | 11.6 | 10.5 | 10.3 | 8.9 | 8.1 |
| Precipitation (mm) | 375 | 133 | 322 | 14 | 20 | 1 | 0 | 95 | 40 | 14 | 37 | 61 |
| Sunny days | 15 | 15 | 8 | 25 | 24 | 25 | 30 | 26 | 25 | 27 | 21 | 24 |
| Rainy days | 16 | 13 | 23 | 5 | 7 | 5 | 1 | 5 | 5 | 4 | 9 | 7 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Rancho Cucamonga during the most sunny months:
The largest precipitation sum in Rancho Cucamonga is at