As of 03:10 PDT

Weather in Portola, CA

63°

Portola, Sunday, 9 August, 03:10

Clear. Feels like 60°. High 96°, low 63°.

Pressure30.06 inHg

Wind1.9 mph SW

Humidity40%

Visibility6.2 mi

Dew point37°

See detailed hourly forecast

Monthly outlook for Portola, CA: average high 83.2°, average low 52°. That is 0.4° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 1 days and 0.2 inches. The warmest day looks like 9 August (95.7°), the coolest 17 August (46.7°).

83.2°/52°

Average high / low

+0.4°

Above normal

0 / 1

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	84.2°	83.6°	+0.4°
19 August – 28 August	81.4°	80.7°	+0.4°
29 August – 7 September	at normal	80°	—

August records over 66 years

97.3°8 August 1981All-time high

35.4°25 August 2024All-time low

Climate normals and records are computed from the nearest reference point — Beckwourth (4 mi).

Mon, 1093° / 62°

93 °

Portola, Monday, 10 August

Mostly clear. High 93°, low 62°.

Pressure29.88 inHg

Wind14.9 mph SW

Humidity13%

Visibility6.2 mi

Dew point34°

Tue, 1191° / 59°

91 °

Portola, Tuesday, 11 August

Mostly clear. High 91°, low 59°.

Pressure29.91 inHg

Wind13.5 mph SW

Humidity17%

Visibility6.2 mi

Dew point39°

Wed, 1288° / 57°

88 °

Portola, Wednesday, 12 August

Overcast. High 88°, low 57°.

Pressure29.83 inHg

Wind11.9 mph SW

Humidity19%

Visibility6.2 mi

Dew point39°

Thu, 1383° / 56°

83 °

Portola, Thursday, 13 August

Overcast. High 83°, low 56°.

Pressure29.80 inHg

Wind13.4 mph SW

Humidity20%

Visibility—

Dew point36°

Fri, 1485° / 52°

85 °

Portola, Friday, 14 August

Clear. High 85°, low 52°.

Pressure29.85 inHg

Wind14.5 mph W

Humidity14%

Visibility—

Dew point28°

Sat, 1583° / 50°

83 °

Portola, Saturday, 15 August

Overcast. High 83°, low 50°.

Pressure29.91 inHg

Wind9.6 mph W

Humidity19%

Visibility—

Dew point34°

Sun, 1673° / 50°

73 °

Portola, Sunday, 16 August

Overcast. High 73°, low 50°.

Pressure30.03 inHg

Wind12.8 mph SW

Humidity39%

Visibility—

Dew point44°

Mon, 1774° / 47°

74 °

Portola, Monday, 17 August

Overcast. High 74°, low 47°.

Pressure29.97 inHg

Wind18.5 mph SW

Humidity24%

Visibility—

Dew point33°

Tue, 1877° / 47°

77 °

Portola, Tuesday, 18 August

Overcast. High 77°, low 47°.

Pressure29.94 inHg

Wind14.4 mph SW

Humidity18%

Visibility—

Dew point28°

Wed, 1982° / 49°

82 °

Portola, Wednesday, 19 August

Clear. High 82°, low 49°.

Pressure29.85 inHg

Wind13.7 mph SW

Humidity23%

Visibility—

Dew point38°

Thu, 2081° / 48°

81 °

Portola, Thursday, 20 August

Clear. High 81°, low 48°.

Pressure29.88 inHg

Wind15.3 mph SW

Humidity20%

Visibility—

Dew point33°

Fri, 2179° / 48°

79 °

Portola, Friday, 21 August

Mostly clear. High 79°, low 48°.

Pressure29.88 inHg

Wind15.4 mph SW

Humidity23%

Visibility—

Dew point36°

Sat, 2278° / 47°

78 °

Portola, Saturday, 22 August

Overcast. High 78°, low 47°.

Pressure29.91 inHg

Wind15.4 mph SW

Humidity22%

Visibility—

Dew point34°

Sun, 2383° / 50°

83 °

Portola, Sunday, 23 August

Mostly clear. High 83°, low 50°.

Pressure29.85 inHg

Wind13 mph SW

Humidity18%

Visibility—

Dew point33°

Mon, 2485° / 49°

85 °

Portola, Monday, 24 August

Clear. High 85°, low 49°.

Pressure29.80 inHg

Wind14.7 mph SW

Humidity14%

Visibility—

Dew point28°

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

Tue, 2580° / 53°

0.01

80 °

Portola, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.01 in

Chance of precipitation7%

Record high92° (2010)

Record low35° (2024)

Wed, 2680° / 53°

0.01

80 °

Portola, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.01 in

Chance of precipitation8%

Record high91° (1988)

Record low43° (1968)

Thu, 2781° / 53°

81 °

Portola, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high81°

Average low53°

Average precipitation0 in

Chance of precipitation3%

Record high91° (2019)

Record low42° (1968)

Fri, 2882° / 54°

82 °

Portola, Friday, 28 August

Climate normal for this date — 60-year average.

Average high82°

Average low54°

Average precipitation0 in

Chance of precipitation0%

Record high91° (2001)

Record low43° (1975)

Sat, 2981° / 53°

0.01

81 °

Portola, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high81°

Average low53°

Average precipitation0.01 in

Chance of precipitation12%

Record high92° (2008)

Record low41° (1975)

Sun, 3080° / 52°

0.01

80 °

Portola, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high80°

Average low52°

Average precipitation0.01 in

Chance of precipitation5%

Record high91° (2022)

Record low40° (2010)

Mon, 3180° / 52°

0.01

80 °

Portola, Monday, 31 August

Climate normal for this date — 60-year average.

Average high80°

Average low52°

Average precipitation0.01 in

Chance of precipitation3%

Record high91° (1976)

Record low38° (1999)

Tue, 0180° / 53°

0.02

80 °

Portola, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.02 in

Chance of precipitation13%

Record high93° (2022)

Record low37° (1964)

Wed, 0280° / 53°

0.02

80 °

Portola, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.02 in

Chance of precipitation8%

Record high92° (2022)

Record low34° (1964)

Thu, 0380° / 53°

0.02

80 °

Portola, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.02 in

Chance of precipitation10%

Record high94° (2020)

Record low41° (1985)

Fri, 0480° / 52°

0.01

80 °

Portola, Friday, 4 September

Climate normal for this date — 60-year average.

Average high80°

Average low52°

Average precipitation0.01 in

Chance of precipitation8%

Record high95° (2020)

Record low40° (2000)

Sat, 0580° / 53°

0.03

80 °

Portola, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high80°

Average low53°

Average precipitation0.03 in

Chance of precipitation8%

Record high95° (2020)

Record low34° (1970)

Sun, 0679° / 52°

0.01

79 °

Portola, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high79°

Average low52°

Average precipitation0.01 in

Chance of precipitation8%

Record high96° (2022)

Record low37° (2000)

Mon, 0779° / 52°

79 °

Portola, Monday, 7 September

Climate normal for this date — 60-year average.

Average high79°

Average low52°

Average precipitation0 in

Chance of precipitation3%

Record high94° (2022)

Record low40° (1978)

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 Portola, 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 Portola, 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.