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Weather in Alto, CA · National Weather Service + NOAA

It hardly ever freezes in Alto

Alto has warm winters and cool summers. A typical July afternoon reaches 70°, a January night drops to 44°, and snow is almost unheard of. Normal November highs come to 62°, and lows to 48°.

Winter 57°/45°Spring 63°/48°Summer 70°/54°Fall 68°/52°
Right now
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Sunrise 9:37 am · sunset 8:10 pm

Getting the latest forecast from the National Weather Service…

What stands out about Alto’s weather

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

Climate →
It hardly ever freezesOnly 22% of years see a night at 32° or below.Cool summersJuly afternoons average 70°, cooler than 99% of U.S. towns.Snow is rareNo measurable snow in a normal year.
A normal year

Where today sits in Alto’s year

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

Full climate →
Winter
57° / 45°
Snow is rare
Spring
63° / 48°
Frost is rare by spring
Summer
70° / 54°
5 days reach 90° in a normal year
Fall now
68° / 52°
Mild well into the fall
Best months to be outside
AprMayJunJulAugSepOctNov
Highs of 62–84° and lows of 40° or more
How much snow does Alto get?Almost none.When is it wettest?December, with 6.5 inches.Is it warmer than it used to be?+1.4° vs. the 20th century.

Weather talk

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

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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 Alto itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Muir Woods, CA (3 mi, snow) and Richmond, CA (8 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.