When to visit
Mediterranean climate, ~287 sunny days a year, and essentially all of the rain between November and March. The planning question isn’t “will it be nice” — it’s “what do you want running, blooming, or snow-capped.”
What is the best time of year to visit Rancho Cucamonga?
March through May. Etiwanda Falls is still flowing, wildflowers are out on the preserve, snow lingers on the peaks, and it's hiking weather all day. The LA County Fair also runs in May at the Pomona Fairplex (2026: May 7–31, Thursday through Sunday). If you can pick your dates, pick these.
What is the weather like in Rancho Cucamonga in the summer?
June through August is hot and dry: rain-free and reliably in the 90s to triple digits, with August the hottest month. It's baseball, free-concert, and movie-night season, so plan around the evenings. Hike at dawn or not at all, and expect Etiwanda Falls to be running low to dry.
What is the weather like in Rancho Cucamonga in the fall?
September through November is warm and clear: warm days, cooling nights, and, after the first Santa Ana winds, the clearest mountain views of the year. Watch for wind- and fire-related trail closures, and check alert pages the morning of any hike.
What is winter like in Rancho Cucamonga?
Mild and green. Nearly all of the year's roughly 18 inches of rain falls between December and February, which means green foothills and the strongest flow at Etiwanda Falls. Snow sits 40 minutes away at Mt. Baldy. Bring a layer; evenings drop into the 40s.
When does it rain in Rancho Cucamonga?
Essentially all of it falls between November and March. The year's total is about 18 inches, nearly all of it landing December through February, and February is the wettest month. Summer is rain-free.
What is the hottest month in Rancho Cucamonga?
August. June through August runs reliably in the 90s to triple digits, and August is the hottest month of the year.
How many sunny days a year does Rancho Cucamonga get?
About 287. The climate is Mediterranean (Köppen Csa), with roughly 18 inches of rain a year, nearly all of it in winter.
When is the best time to see Etiwanda Falls flowing?
Winter gives the best odds. December through February is when nearly all of the year's rain lands, and the falls run strongest then. They are still flowing in March through May. By June through August, expect them to be running low to dry.
Can you see snow near Rancho Cucamonga?
In winter, snow sits 40 minutes away at Mt. Baldy, and in spring (March through May) snow still lingers on the peaks.