Modesto averages 85.1 days a year above 90°F, with January the wettest month at 2.57 in of normal rain. The hottest day on record was 113°F on Jul 23, 2006; the coldest, 19°F on Dec 22, 1990. The single biggest 24-hour rain event recorded was 2.72 in on Mar 4, 1978.
Climate and Average Weather Year Round in Modesto
Year-round temperature
In Modesto, the warmest months are June through September, with average daily highs between 89°F and 95°F. The coldest stretch runs December through February, with highs between 56°F and 62°F and overnight lows reaching 39°F.
Rainfall through the year
Rainfall in Modesto averages 1.0 in per month over the long run. January is the wettest at 2.6 in, while July is the driest at 0.0 in.
Days at 90 °F or hotter
Modesto averages 85.1 days per year at 90 °F or hotter. The hottest year on record saw 115 such days (2020); the coolest just 8 (2026).
Precipitation this year
As of May 28, Modesto has received 6.7 in of precipitation this year — 18% below the long-term normal for this point in the year (8.2 in).