Pasadena averages 69.4 days a year above 90°F, with February the wettest month at 5.16 in of normal rain. The hottest day on record was 115°F on Sep 6, 2020; the coldest, 26°F on Dec 22, 1990. The single biggest 24-hour rain event recorded was 5.55 in on Nov 29, 1970.
Climate and Average Weather Year Round in Pasadena
Year-round temperature
In Pasadena, the warmest months are June through September, with average daily highs between 84°F and 91°F. The coldest stretch runs December through February, with highs between 67°F and 69°F and overnight lows reaching 45°F.
Rainfall through the year
Rainfall in Pasadena averages 1.7 in per month over the long run. February is the wettest at 5.2 in, while August is the driest at 0.0 in.
Days at 90 °F or hotter
Pasadena averages 69.4 days per year at 90 °F or hotter. The hottest year on record saw 111 such days (2022); the coolest just 12 (2026).
Precipitation this year
As of May 29, Pasadena has received 8.4 in of precipitation this year — 41% below the long-term normal for this point in the year (14.3 in).