Stockton averages 86.1 days a year above 90°F, with January the wettest month at 2.67 in of normal rain. The hottest day on record was 115°F on Jul 23, 2006; the coldest, 17°F on Dec 22, 1990. The single biggest 24-hour rain event recorded was 2.85 in on Dec 31, 2022.
Climate and Average Weather Year Round in Stockton
Year-round temperature
In Stockton, the warmest months are June through September, with average daily highs between 90°F and 95°F. The coldest stretch runs December through February, with highs between 57°F and 63°F and overnight lows reaching 38°F.
Rainfall through the year
Rainfall in Stockton averages 1.1 in per month over the long run. January is the wettest at 2.7 in, while July is the driest at 0.0 in.
Days at 90 °F or hotter
Stockton averages 86.1 days per year at 90 °F or hotter. The hottest year on record saw 129 such days (2020); the coolest just 9 (2026).
Precipitation this year
As of May 28, Stockton has received 8.0 in of precipitation this year — 8% below the long-term normal for this point in the year (8.7 in).