Best Time to Visit Rancho Cucamonga
Best time: Jun, Jul, Aug, May.
Aug is warmest (33.6°C high); Feb is rainiest (82 mm).
Rancho Cucamonga weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 18.9 | 5.2 | 78 | 4.6 |
| Feb | 19.9 | 6.1 | 82 | 5.6 |
| Mar | 20.7 | 7.1 | 72 | 7.8 |
| Apr | 23.9 | 8.5 | 27 | 9.8 |
| May | 25.9 | 11.2 | 8 | 10.8 |
| Jun | 29.8 | 13.6 | 1 | 11.7 |
| Jul | 33.3 | 15.8 | 1 | 11.6 |
| Aug | 33.6 | 16.4 | 4 | 10.9 |
| Sep | 31.4 | 15 | 9 | 9 |
| Oct | 27.5 | 11.6 | 10 | 6.9 |
| Nov | 22.8 | 7.3 | 41 | 5.3 |
| Dec | 19.4 | 4.7 | 52 | 4.4 |
Average high temperature
Best months by activity
Overall: JunJulAugMay
Beaches: JulJunAugSep
Hiking: MayJunOctApr
Sightseeing: JunJulMayAug
Rancho Cucamonga quick facts
What to pack
Mild year-round — pack layers and a light jacket.
Frequently asked questions
When is the best time to visit Rancho Cucamonga?
Jun, Jul, Aug, May.
What is the rainiest month?
Feb, about 82 mm.
What is the warmest month?
Aug, with average highs of 33.6°C.
Where to stay
See Rancho Cucamonga hotels · Book Rancho Cucamonga tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.