As of 14:07 PDT

Weather in Guerneville, CA

88°

Guerneville, Sunday, 9 August, 14:07

Clear. Feels like 90°. High 88°, low 58°.

Pressure29.83 inHg

Wind1 mph E

Humidity49%

Visibility6.2 mi

Dew point64°

See detailed hourly forecast

Monthly outlook for Guerneville, CA: average high 87°, average low 55.4°. That is 2.8° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.0 inches. The warmest day looks like 21 August (103°), the coolest 11 August (49.6°).

87°/55.4°

Average high / low

+2.8°

Above normal

0 / 0

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	81.4°	82.6°	-0.7°
19 August – 28 August	96.3°	81.1°	+8.4°
29 August – 7 September	at normal	82.8°	—

August records over 66 years

108.3°18 August 2020All-time high

48°10 August 1960All-time low

Climate normals and records are computed from the nearest reference point — Forestville (6 mi).

Mon, 1080° / 52°

80 °

Guerneville, Monday, 10 August

Mostly clear. High 80°, low 52°.

Pressure29.85 inHg

Wind6 mph S

Humidity25%

Visibility6.2 mi

Dew point47°

Tue, 1186° / 50°

86 °

Guerneville, Tuesday, 11 August

Clear. High 86°, low 50°.

Pressure29.91 inHg

Wind5.6 mph S

Humidity27%

Visibility6.2 mi

Dew point48°

Wed, 1283° / 51°

83 °

Guerneville, Wednesday, 12 August

Overcast. High 83°, low 51°.

Pressure29.83 inHg

Wind5.8 mph S

Humidity29%

Visibility6.2 mi

Dew point48°

Thu, 1373° / 53°

73 °

Guerneville, Thursday, 13 August

Overcast. High 73°, low 53°.

Pressure29.85 inHg

Wind8.7 mph S

Humidity49%

Visibility6.2 mi

Dew point53°

Fri, 1475° / 52°

75 °

Guerneville, Friday, 14 August

Clear. High 75°, low 52°.

Pressure29.94 inHg

Wind9.6 mph SW

Humidity45%

Visibility—

Dew point50°

Sat, 1575° / 52°

75 °

Guerneville, Saturday, 15 August

Mostly clear. High 75°, low 52°.

Pressure30.03 inHg

Wind9.4 mph SW

Humidity46%

Visibility—

Dew point51°

Sun, 1678° / 50°

78 °

Guerneville, Sunday, 16 August

Overcast. High 78°, low 50°.

Pressure30.06 inHg

Wind8.7 mph SW

Humidity36%

Visibility—

Dew point46°

Mon, 1782° / 50°

82 °

Guerneville, Monday, 17 August

Clear. High 82°, low 50°.

Pressure29.97 inHg

Wind7.4 mph S

Humidity28%

Visibility—

Dew point43°

Tue, 1893° / 53°

93 °

Guerneville, Tuesday, 18 August

Clear. High 93°, low 53°.

Pressure29.91 inHg

Wind7.7 mph W

Humidity18%

Visibility—

Dew point39°

Wed, 1994° / 56°

94 °

Guerneville, Wednesday, 19 August

Clear. High 94°, low 56°.

Pressure29.91 inHg

Wind7.7 mph SW

Humidity23%

Visibility—

Dew point45°

Thu, 2098° / 60°

98 °

Guerneville, Thursday, 20 August

Clear. High 98°, low 60°.

Pressure29.91 inHg

Wind8.2 mph S

Humidity18%

Visibility—

Dew point44°

Fri, 21103° / 69°

103 °

Guerneville, Friday, 21 August

Clear. High 103°, low 69°.

Pressure29.91 inHg

Wind7.6 mph SW

Humidity12%

Visibility—

Dew point38°

Sat, 22103° / 71°

103 °

Guerneville, Saturday, 22 August

Clear. High 103°, low 71°.

Pressure29.83 inHg

Wind8.6 mph SW

Humidity15%

Visibility—

Dew point43°

Sun, 2396° / 57°

96 °

Guerneville, Sunday, 23 August

Clear. High 96°, low 57°.

Pressure29.83 inHg

Wind8.3 mph S

Humidity29%

Visibility—

Dew point51°

Mon, 2484° / 54°

84 °

Guerneville, Monday, 24 August

Mostly clear. High 84°, low 54°.

Pressure29.88 inHg

Wind7.6 mph S

Humidity37%

Visibility—

Dew point52°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 2580° / 57°

80 °

Guerneville, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high80°

Average low57°

Average precipitation0 in

Chance of precipitation2%

Record high99° (1988)

Record low50° (1966)

Wed, 2681° / 56°

81 °

Guerneville, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low56°

Average precipitation0 in

Chance of precipitation0%

Record high99° (2017)

Record low50° (2021)

Thu, 2783° / 57°

83 °

Guerneville, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high104° (2017)

Record low50° (1960)

Fri, 2883° / 58°

83 °

Guerneville, Friday, 28 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2021)

Record low53° (1985)

Sat, 2982° / 58°

82 °

Guerneville, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high82°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high97° (2023)

Record low51° (1980)

Sun, 3082° / 58°

82 °

Guerneville, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high82°

Average low58°

Average precipitation0 in

Chance of precipitation3%

Record high97° (2023)

Record low52° (1970)

Mon, 3183° / 57°

0.02

83 °

Guerneville, Monday, 31 August

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0.02 in

Chance of precipitation3%

Record high99° (2019)

Record low49° (1970)

Tue, 0183° / 57°

83 °

Guerneville, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation2%

Record high109° (2017)

Record low51° (2022)

Wed, 0283° / 58°

83 °

Guerneville, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high110° (2017)

Record low50° (1960)

Thu, 0383° / 57°

83 °

Guerneville, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high99° (1988)

Record low49° (2000)

Fri, 0483° / 57°

83 °

Guerneville, Friday, 4 September

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high103° (2022)

Record low48° (1960)

Sat, 0583° / 58°

83 °

Guerneville, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high110° (2022)

Record low49° (1965)

Sun, 0683° / 57°

83 °

Guerneville, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high118° (2022)

Record low51° (2024)

Mon, 0783° / 57°

0.01

83 °

Guerneville, Monday, 7 September

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0.01 in

Chance of precipitation3%

Record high113° (2020)

Record low49° (2012)

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 Guerneville, 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 Guerneville, 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.