Monthly outlook for Forest Knolls, CA: average high 70.7°, average low 53.5°. That is 0.9° below 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 9 August (86.7°), the coolest 19 August (51°).
70.7°/53.5°
Average high / low
−0.9°
Below normal
0 / 0
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
72.1°
72.5°
-0.2°
18 August – 27 August
68.4°
72.1°
-2.1°
28 August – 6 September
at normal
74.1°
—
August records over 66 years
96.6°14 August 2020All-time high
47.5°10 August 1960All-time low
Climate normals and records are computed from the nearest reference point — Marin City (14 mi).
Sun, 0987° / 57°0
87 °
Forest Knolls, Sunday, 9 August
Clear. High 87°, low 57°.
Pressure29.83 inHg
Wind5.2 mph SW
Humidity41%
Visibility6.2 mi
Dew point50°
Mon, 1074° / 52°0
74 °
Forest Knolls, Monday, 10 August
Mostly clear. High 74°, low 52°.
Pressure29.88 inHg
Wind7 mph SW
Humidity54%
Visibility6.2 mi
Dew point52°
Tue, 1172° / 53°0
72 °
Forest Knolls, Tuesday, 11 August
Clear. High 72°, low 53°.
Pressure29.91 inHg
Wind8.1 mph S
Humidity53%
Visibility6.2 mi
Dew point52°
Wed, 1267° / 54°0
67 °
Forest Knolls, Wednesday, 12 August
Mostly clear. High 67°, low 54°.
Pressure29.85 inHg
Wind9 mph S
Humidity62%
Visibility6.2 mi
Dew point53°
Thu, 1365° / 55°0
65 °
Forest Knolls, Thursday, 13 August
Partly cloudy. High 65°, low 55°.
Pressure29.85 inHg
Wind12.3 mph S
Humidity68%
Visibility—
Dew point53°
Fri, 1466° / 54°0
66 °
Forest Knolls, Friday, 14 August
Clear. High 66°, low 54°.
Pressure29.97 inHg
Wind11.1 mph SW
Humidity63%
Visibility—
Dew point52°
Sat, 1569° / 54°0
69 °
Forest Knolls, Saturday, 15 August
Clear. High 69°, low 54°.
Pressure30.03 inHg
Wind7.7 mph SW
Humidity59%
Visibility—
Dew point53°
Sun, 1670° / 53°0
70 °
Forest Knolls, Sunday, 16 August
Overcast. High 70°, low 53°.
Pressure30.06 inHg
Wind7.5 mph W
Humidity53%
Visibility—
Dew point50°
Mon, 1768° / 54°0
68 °
Forest Knolls, Monday, 17 August
Overcast. High 68°, low 54°.
Pressure30.06 inHg
Wind7.3 mph W
Humidity64%
Visibility—
Dew point52°
Tue, 1868° / 53°0
68 °
Forest Knolls, Tuesday, 18 August
Clear. High 68°, low 53°.
Pressure30.06 inHg
Wind10.6 mph W
Humidity55%
Visibility—
Dew point50°
Wed, 1970° / 51°0
70 °
Forest Knolls, Wednesday, 19 August
Mostly clear. High 70°, low 51°.
Pressure30.00 inHg
Wind12.9 mph W
Humidity54%
Visibility—
Dew point49°
Thu, 2071° / 51°0
71 °
Forest Knolls, Thursday, 20 August
Overcast. High 71°, low 51°.
Pressure29.91 inHg
Wind7.3 mph W
Humidity52%
Visibility—
Dew point50°
Fri, 2167° / 53°0
67 °
Forest Knolls, Friday, 21 August
Overcast. High 67°, low 53°.
Pressure29.88 inHg
Wind8.3 mph S
Humidity59%
Visibility—
Dew point51°
Sat, 2266° / 53°0
66 °
Forest Knolls, Saturday, 22 August
Overcast. High 66°, low 53°.
Pressure29.97 inHg
Wind8.6 mph SW
Humidity63%
Visibility—
Dew point51°
Sun, 2369° / 53°0
69 °
Forest Knolls, Sunday, 23 August
Clear. High 69°, low 53°.
Pressure29.94 inHg
Wind7 mph SW
Humidity55%
Visibility—
Dew point50°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2472° / 56°0
72 °
Forest Knolls, Monday, 24 August
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0 in
Chance of precipitation2%
Record high89° (2010)
Record low51° (1988)
Tue, 2572° / 56°0
72 °
Forest Knolls, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high85° (1988)
Record low50° (1960)
Wed, 2673° / 55°0
73 °
Forest Knolls, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high73°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high88° (2017)
Record low48° (2005)
Thu, 2774° / 56°0
74 °
Forest Knolls, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high93° (2017)
Record low51° (2009)
Fri, 2874° / 56°0
74 °
Forest Knolls, Friday, 28 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high90° (2021)
Record low51° (1960)
Sat, 2973° / 56°0
73 °
Forest Knolls, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high92° (1968)
Record low52° (1964)
Sun, 3073° / 57°0
73 °
Forest Knolls, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0 in
Chance of precipitation2%
Record high92° (2025)
Record low52° (1960)
Mon, 3174° / 56°0
74 °
Forest Knolls, Monday, 31 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation3%
Record high95° (2017)
Record low51° (2002)
Tue, 0175° / 56°0
75 °
Forest Knolls, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high75°
Average low56°
Average precipitation0 in
Chance of precipitation2%
Record high103° (2017)
Record low50° (1973)
Wed, 0274° / 56°0
74 °
Forest Knolls, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation2%
Record high103° (2017)
Record low51° (1975)
Thu, 0374° / 56°0
74 °
Forest Knolls, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high92° (2024)
Record low49° (1973)
Fri, 0474° / 56°0
74 °
Forest Knolls, Friday, 4 September
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high91° (2022)
Record low51° (1989)
Sat, 0575° / 56°0
75 °
Forest Knolls, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high101° (2022)
Record low49° (1969)
Sun, 0675° / 56°0
75 °
Forest Knolls, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low56°
Average precipitation0 in
Chance of precipitation0%
Record high106° (2022)
Record low49° (1969)
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 Forest Knolls, 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 Forest Knolls, 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.