With a population of around 1,400, Janesville sits in California, United States. The city operates in the Pacific Time Zone.
Recent weather here gives a sense of typical conditions: in 2025, Janesville recorded a mean annual temperature of 53°F, ranging from 3°F lows in February to 102°F highs in July, with about 30 inches of precipitation across the year.
View historical weather for Janesville · More cities in California