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Weather in Altadena, CA · National Weather Service + NOAA

It hardly ever freezes in Altadena

Altadena has warm winters and warm summers, with very little rain. A typical July afternoon reaches 89°, a January night drops to 45°, and snow is almost unheard of. Normal November highs come to 73°, and lows to 49°.

Winter 66°/45°Spring 74°/51°Summer 88°/62°Fall 80°/56°
Right now
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Sunrise 9:13 am · sunset 7:58 pm

Getting the latest forecast from the National Weather Service…

What stands out about Altadena’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
It hardly ever freezesOnly 13% of years see a night at 32° or below.Milder winters than most of CaliforniaJanuary nights average 45°, milder than 1,436 of 1,618 California towns.Snow is rareNo measurable snow in a normal year.Warming faster than mostThe last 30 years averaged 2.6° warmer than the 1900s, a bigger shift than 100% of U.S. towns.
A normal year

Where today sits in Altadena’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
66° / 45°
Snow is rare
Spring
74° / 51°
Frost is rare by spring
Summer
88° / 62°
74 days reach 90° in a normal year
Fall now
80° / 56°
Mild well into the fall
Best months to be outside
JanFebMarAprMayJunOctNovDec
Highs of 62–84° and lows of 40° or more
How much snow does Altadena get?Almost none.When is it wettest?February, with 5.5 inches.Is it warmer than it used to be?+2.6° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Altadena.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Altadena itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Altadena, CA (1 mi, snow) and Pasadena, CA (3 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.