Monthly outlook for Sonoma, CA: average high 84.5°, average low 53.8°. That is 5.5° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 2 days and 0.8 inches. The warmest day looks like 26 October (95.5°), the coolest 11 October (48.6°).
84.5°/53.8°
Average high / low
+5.5°
Above normal
0 / 2
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
82.7°
75.9°
+3.8°
21 October – 30 October
87.5°
71.5°
+8.9°
31 October – 9 November
at normal
68°
—
October records over 66 years
102.6°1 October 2020All-time high
37.6°28 October 2023All-time low
Climate normals and records are computed from the nearest reference point — Boyes Hot Springs (2 mi).
Mon, 1272° / 49°0
72 °
Sonoma, Monday, 12 October
Clear. High 72°, low 49°.
Pressure29.88 inHg
Wind2.6 mph SW
Humidity36%
Visibility6.2 mi
Dew point39°
Tue, 1379° / 50°0
79 °
Sonoma, Tuesday, 13 October
Clear. High 79°, low 50°.
Pressure30.06 inHg
Wind6 mph NE
Humidity20%
Visibility6.2 mi
Dew point23°
Wed, 1481° / 51°0
81 °
Sonoma, Wednesday, 14 October
Clear. High 81°, low 51°.
Pressure30.09 inHg
Wind3 mph S
Humidity29%
Visibility6.2 mi
Dew point40°
Thu, 1590° / 55°0
90 °
Sonoma, Thursday, 15 October
Clear. High 90°, low 55°.
Pressure30.09 inHg
Wind3.7 mph N
Humidity25%
Visibility—
Dew point37°
Fri, 1691° / 60°0
91 °
Sonoma, Friday, 16 October
Clear. High 91°, low 60°.
Pressure30.00 inHg
Wind4.9 mph SW
Humidity17%
Visibility—
Dew point31°
Sat, 1794° / 62°0
94 °
Sonoma, Saturday, 17 October
Clear. High 94°, low 62°.
Pressure30.09 inHg
Wind5 mph S
Humidity15%
Visibility—
Dew point30°
Sun, 1889° / 57°0
89 °
Sonoma, Sunday, 18 October
Clear. High 89°, low 57°.
Pressure30.00 inHg
Wind6.1 mph W
Humidity22%
Visibility—
Dew point36°
Mon, 1982° / 51°0
82 °
Sonoma, Monday, 19 October
Mostly clear. High 82°, low 51°.
Pressure30.09 inHg
Wind10.6 mph W
Humidity30%
Visibility—
Dew point34°
Tue, 2081° / 50°0
81 °
Sonoma, Tuesday, 20 October
Clear. High 81°, low 50°.
Pressure30.06 inHg
Wind5.8 mph SW
Humidity28%
Visibility—
Dew point35°
Wed, 2183° / 52°0
83 °
Sonoma, Wednesday, 21 October
Clear. High 83°, low 52°.
Pressure29.97 inHg
Wind6.5 mph W
Humidity24%
Visibility—
Dew point33°
Thu, 2285° / 52°0
85 °
Sonoma, Thursday, 22 October
Clear. High 85°, low 52°.
Pressure29.97 inHg
Wind6.5 mph W
Humidity19%
Visibility—
Dew point28°
Fri, 2385° / 50°0
85 °
Sonoma, Friday, 23 October
Clear. High 85°, low 50°.
Pressure30.00 inHg
Wind5.9 mph SW
Humidity18%
Visibility—
Dew point26°
Sat, 2486° / 53°0
86 °
Sonoma, Saturday, 24 October
Clear. High 86°, low 53°.
Pressure29.97 inHg
Wind4.8 mph NW
Humidity16%
Visibility—
Dew point24°
Sun, 2591° / 57°0
91 °
Sonoma, Sunday, 25 October
Clear. High 91°, low 57°.
Pressure30.06 inHg
Wind4.3 mph SE
Humidity11%
Visibility—
Dew point19°
Mon, 2695° / 61°0
95 °
Sonoma, Monday, 26 October
Clear. High 95°, low 61°.
Pressure29.97 inHg
Wind4.9 mph NW
Humidity8%
Visibility—
Dew point14°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2771° / 50°0.04
71 °
Sonoma, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high71°
Average low50°
Average precipitation0.04 in
Chance of precipitation7%
Record high91° (2003)
Record low39° (2023)
Wed, 2870° / 50°0.08
70 °
Sonoma, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high70°
Average low50°
Average precipitation0.08 in
Chance of precipitation18%
Record high90° (2003)
Record low38° (2023)
Thu, 2970° / 49°0.07
70 °
Sonoma, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.07 in
Chance of precipitation22%
Record high83° (1965)
Record low40° (1971)
Fri, 3069° / 49°0.06
69 °
Sonoma, Friday, 30 October
Climate normal for this date — 60-year average.
Average high69°
Average low49°
Average precipitation0.06 in
Chance of precipitation18%
Record high85° (1966)
Record low40° (2023)
Sat, 3170° / 49°0.04
70 °
Sonoma, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.04 in
Chance of precipitation17%
Record high87° (1966)
Record low38° (2023)
Sun, 0170° / 49°0.07
70 °
Sonoma, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.07 in
Chance of precipitation15%
Record high86° (1967)
Record low37° (2003)
Mon, 0270° / 49°0.05
70 °
Sonoma, Monday, 2 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.05 in
Chance of precipitation13%
Record high86° (1967)
Record low40° (2022)
Tue, 0369° / 49°0.04
69 °
Sonoma, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high69°
Average low49°
Average precipitation0.04 in
Chance of precipitation13%
Record high85° (2018)
Record low36° (2022)
Wed, 0469° / 49°0.03
69 °
Sonoma, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high69°
Average low49°
Average precipitation0.03 in
Chance of precipitation12%
Record high83° (1976)
Record low40° (1973)
Thu, 0568° / 49°0.08
68 °
Sonoma, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high68°
Average low49°
Average precipitation0.08 in
Chance of precipitation15%
Record high83° (2020)
Record low40° (2017)
Fri, 0667° / 50°0.07
67 °
Sonoma, Friday, 6 November
Climate normal for this date — 60-year average.
Average high67°
Average low50°
Average precipitation0.07 in
Chance of precipitation20%
Record high81° (1976)
Record low41° (1972)
Sat, 0767° / 49°0.1
67 °
Sonoma, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high67°
Average low49°
Average precipitation0.1 in
Chance of precipitation23%
Record high82° (1991)
Record low39° (2022)
Sun, 0865° / 48°0.09
65 °
Sonoma, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high65°
Average low48°
Average precipitation0.09 in
Chance of precipitation23%
Record high79° (1978)
Record low40° (2021)
Mon, 0965° / 47°0.11
65 °
Sonoma, Monday, 9 November
Climate normal for this date — 60-year average.
Average high65°
Average low47°
Average precipitation0.11 in
Chance of precipitation20%
Record high79° (1990)
Record low37° (2023)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Sonoma, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Sonoma, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.