Pasadena averages 97.1 days a year above 90°F, with June the wettest month at 6.09 in of normal rain. The hottest day on record was 109°F on Aug 27, 2023; the coldest, 9°F on Dec 23, 1989. The single biggest 24-hour rain event recorded was 12.07 in on Aug 26, 2017.
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 89°F and 94°F. The coldest stretch runs December through February, with highs between 64°F and 68°F and overnight lows reaching 46°F.
Rainfall through the year
Rainfall in Pasadena averages 4.6 in per month over the long run. June is the wettest at 6.1 in, while February is the driest at 2.9 in.
Days at 90 °F or hotter
Pasadena averages 97.1 days per year at 90 °F or hotter. The hottest year on record saw 136 such days (2025); the coolest just 5 (2026).
Precipitation this year
As of May 29, Pasadena has received 16.9 in of precipitation this year — 13% below the long-term normal for this point in the year (19.4 in).