Arvada averages 38.8 days a year above 90°F, with May the wettest month at 2.65 in of normal rain. The hottest day on record was 103°F on Jul 7, 1989; the coldest, −24°F on Dec 22, 1990. The single biggest 24-hour rain event recorded was 3.63 in on Jun 3, 1981.
Climate and Average Weather Year Round in Arvada
Year-round temperature
In Arvada, the warmest months are June through September, with average daily highs between 79°F and 88°F. The coldest stretch runs December through February, with highs between 47°F and 48°F and overnight lows reaching 17°F.
Rainfall through the year
Rainfall in Arvada averages 1.4 in per month over the long run. May is the wettest at 2.6 in, while December is the driest at 0.6 in.
Days at 90 °F or hotter
Arvada averages 38.8 days per year at 90 °F or hotter. The hottest year on record saw 63 such days (2002); the coolest just 1 (2026).
Precipitation this year
As of May 28, Arvada has received 3.9 in of precipitation this year — 49% below the long-term normal for this point in the year (7.6 in).