Is this weather normal in Sonoma County?

California · county records since 1895, through September 2026.

Weather › California › Sonoma County

10 of the last 12 months ran warmer than usual in Sonoma County. Sonoma County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 68°, lows near 46°

That is the 1991 to 2020 average for these dates in Sonoma County. The Weather Service forecast fills in below.

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usual high for the datewarmercooler

The last 12 months

Oct: -1.1°OctNov: +2.0°NovDec: +1.4°DecJan 2026: +2.6°JanFeb: +2.4°FebMar: +8.8°MarApr: +0.3°AprMay: +1.0°MayJun: +0.3°JunJul: +0.2°JulAug: +0.6°AugSep: -1.5°Sepwarmercooler

Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1895.

Every year since 1895

18952025

Rain and drought

Oct: +0.2 inOctNov: +1.8 inNovDec: -0.1 inDecJan 2026: -1.8 inJanFeb: -1.0 inFebMar: -5.5 inMarApr: +1.9 inAprMay: -0.7 inMayJun: -0.3 inJunJul: 0.0 inJulAug: -0.0 inAugSep: +0.1 inSepwetterdrier

Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.

Month by month in Sonoma County

MonthUsual high / lowUsual rainWarmestColdest
January57° / 40°8.2 in53.5° 201439.4° 1937
February59° / 41°7.9 in55.4° 201544.3° 1949
March62° / 42°5.8 in60.8° 202646.0° 1897
April65° / 43°2.9 in58.0° 201345.3° 1967
May71° / 47°1.5 in64.0° 200152.8° 1933
June77° / 51°0.3 in68.0° 198158.0° 1923
July80° / 53°0.0 in70.3° 202462.6° 1924
August81° / 53°0.0 in71.0° 202062.7° 1911
September80° / 52°0.2 in69.6° 202060.1° 1911
October74° / 48°1.9 in67.2° 202054.8° 1916
November63° / 43°4.4 in56.6° 199546.5° 1994
December57° / 40°8.8 in52.4° 201442.0° 1990

Warmest and coldest are the month's whole-month average temperature, with the year it happened.

Towns in Sonoma County

Crime Radar: Santa Rosa, Rohnert Park, Healdsburg, Cloverdale, Sebastopol, Cotati

Nearby counties