As of 14:43 PDT

Weather in Alto, CA

67°

Alto, Saturday, 8 August, 14:43

Partly cloudy. Feels like 67°. High 73°, low 58°.

Pressure29.91 inHg

Wind11 mph W

Humidity77%

Visibility6.2 mi

Dew point59°

See detailed hourly forecast

Monthly outlook for Alto, CA: average high 65.8°, average low 56.1°. That is 3.6° 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 (85.7°), the coolest 10 August (55.1°).

65.8°/56.1°

Average high / low

−3.6°

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	66.3°	72.5°	-3.5°
18 August – 27 August	65°	72.1°	-4°
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 (2 mi).

Sun, 0986° / 58°

86 °

Alto, Sunday, 9 August

Clear. High 86°, low 58°.

Pressure29.83 inHg

Wind5.7 mph SW

Humidity67%

Visibility6.2 mi

Dew point52°

Mon, 1064° / 55°

64 °

Alto, Monday, 10 August

Partly cloudy. High 64°, low 55°.

Pressure29.88 inHg

Wind12.4 mph SW

Humidity74%

Visibility6.2 mi

Dew point53°

Tue, 1165° / 55°

65 °

Alto, Tuesday, 11 August

Mostly clear. High 65°, low 55°.

Pressure29.94 inHg

Wind11.5 mph SW

Humidity76%

Visibility6.2 mi

Dew point54°

Wed, 1262° / 55°

62 °

Alto, Wednesday, 12 August

Partly cloudy. High 62°, low 55°.

Pressure29.88 inHg

Wind11.5 mph SW

Humidity79%

Visibility6.2 mi

Dew point55°

Thu, 1361° / 57°

61 °

Alto, Thursday, 13 August

Overcast. High 61°, low 57°.

Pressure29.85 inHg

Wind15.6 mph SW

Humidity79%

Visibility—

Dew point54°

Fri, 1461° / 57°

61 °

Alto, Friday, 14 August

Overcast. High 61°, low 57°.

Pressure29.94 inHg

Wind13 mph SW

Humidity79%

Visibility—

Dew point54°

Sat, 1563° / 56°

63 °

Alto, Saturday, 15 August

Clear. High 63°, low 56°.

Pressure30.03 inHg

Wind11.8 mph SW

Humidity70%

Visibility—

Dew point52°

Sun, 1664° / 55°

64 °

Alto, Sunday, 16 August

Overcast. High 64°, low 55°.

Pressure30.03 inHg

Wind12.1 mph SW

Humidity67%

Visibility—

Dew point52°

Mon, 1763° / 56°

63 °

Alto, Monday, 17 August

Overcast. High 63°, low 56°.

Pressure30.06 inHg

Wind12.2 mph SW

Humidity74%

Visibility—

Dew point54°

Tue, 1866° / 55°

66 °

Alto, Tuesday, 18 August

Mostly clear. High 66°, low 55°.

Pressure30.03 inHg

Wind12.3 mph W

Humidity66%

Visibility—

Dew point51°

Wed, 1967° / 55°

67 °

Alto, Wednesday, 19 August

Clear. High 67°, low 55°.

Pressure29.97 inHg

Wind15.6 mph W

Humidity66%

Visibility—

Dew point53°

Thu, 2064° / 56°

64 °

Alto, Thursday, 20 August

Overcast. High 64°, low 56°.

Pressure29.94 inHg

Wind11.8 mph SW

Humidity78%

Visibility—

Dew point56°

Fri, 2165° / 56°

65 °

Alto, Friday, 21 August

Mostly clear. High 65°, low 56°.

Pressure29.88 inHg

Wind10.6 mph SW

Humidity70%

Visibility—

Dew point54°

Sat, 2265° / 56°

65 °

Alto, Saturday, 22 August

Overcast. High 65°, low 56°.

Pressure29.85 inHg

Wind12.4 mph SW

Humidity74%

Visibility—

Dew point55°

Sun, 2363° / 55°

63 °

Alto, Sunday, 23 August

Overcast. High 63°, low 55°.

Pressure29.88 inHg

Wind13.4 mph SW

Humidity77%

Visibility—

Dew point55°

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

Mon, 2472° / 56°

72 °

Alto, 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°

72 °

Alto, 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°

73 °

Alto, 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°

74 °

Alto, 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°

74 °

Alto, 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°

73 °

Alto, 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°

73 °

Alto, 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°

74 °

Alto, 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°

75 °

Alto, 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°

74 °

Alto, 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°

74 °

Alto, 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°

74 °

Alto, 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°

75 °

Alto, 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°

75 °

Alto, 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 Alto, 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 Alto, 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.