The best time to visit San Bernardino
Month-by-month climate averages for San Bernardino, CA, so you can pick your dates on data rather than guesswork.
The most comfortable time to visit San Bernardino is usually January, March, April and November, when daytime highs sit in the pleasant 60-78°F range and the heaviest February rain is behind you.
San Bernardino is warmest in August (highs near 96°F) and coldest in December (lows around 38°F), with roughly 21 inches of precipitation across the year and February the wettest month. The sweet spot for most visitors is January, March, April and November.
These are long-run averages. For the actual days you are travelling, check the live San Bernardino forecast - and note how much the models agree, because that tells you how much to trust it.
San Bernardino weather by month
what to expect in San Bernardino through the year, 1991-2020 averagesHere is San Bernardino'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 San Bernardino by season.