The best time to visit Rancho Cucamonga
Month-by-month climate averages for Rancho Cucamonga, CA, so you can pick your dates on data rather than guesswork.
The most comfortable time to visit Rancho Cucamonga is usually January, March, April and May, when daytime highs sit in the pleasant 60-78°F range and the heaviest February rain is behind you.
Rancho Cucamonga is warmest in August (highs near 93°F) and coldest in December (lows around 42°F), with roughly 23 inches of precipitation across the year and February the wettest month. The sweet spot for most visitors is January, March, April and May.
These are long-run averages. For the actual days you are travelling, check the live Rancho Cucamonga forecast - and note how much the models agree, because that tells you how much to trust it.
Rancho Cucamonga weather by month
what to expect in Rancho Cucamonga through the year, 1991-2020 averagesHere is Rancho Cucamonga's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Rancho Cucamonga by season.