As of 21:00 PDT

Weather in Cupertino, CA

67°

Cupertino, Saturday, 8 August, 21:00

Clear. Feels like 67°. High 86°, low 60°.

Pressure29.88 inHg

Wind3 mph W

Humidity73%

Visibility6.2 mi

Dew point57°

See detailed hourly forecast

Monthly outlook for Cupertino, CA: average high 87.9°, average low 59°. That is 3.9° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 10 August (96.7°), the coolest 20 August (55.7°).

87.9°/59°

Average high / low

+3.9°

Above 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	89.1°	81.6°	+4.2°
18 August – 27 August	85.8°	80.4°	+3°
28 August – 6 September	at normal	82°	—

August records over 66 years

102.6°3 August 1998All-time high

48.9°23 August 1973All-time low

Sun, 0991° / 64°

91 °

Cupertino, Sunday, 9 August

Clear. High 91°, low 64°.

Pressure29.83 inHg

Wind4.3 mph N

Humidity15%

Visibility6.2 mi

Dew point45°

Mon, 1097° / 64°

97 °

Cupertino, Monday, 10 August

Overcast. High 97°, low 64°.

Pressure29.85 inHg

Wind1.4 mph W

Humidity19%

Visibility6.2 mi

Dew point47°

Tue, 1196° / 61°

96 °

Cupertino, Tuesday, 11 August

Clear. High 96°, low 61°.

Pressure29.91 inHg

Wind1.8 mph W

Humidity18%

Visibility6.2 mi

Dew point44°

Wed, 1291° / 61°

91 °

Cupertino, Wednesday, 12 August

Partly cloudy. High 91°, low 61°.

Pressure29.83 inHg

Wind3.2 mph SW

Humidity26%

Visibility6.2 mi

Dew point49°

Thu, 1381° / 59°

81 °

Cupertino, Thursday, 13 August

Overcast. High 81°, low 59°.

Pressure29.83 inHg

Wind7.5 mph S

Humidity36%

Visibility—

Dew point49°

Fri, 1486° / 57°

86 °

Cupertino, Friday, 14 August

Clear. High 86°, low 57°.

Pressure29.91 inHg

Wind4.1 mph W

Humidity30%

Visibility—

Dew point48°

Sat, 1588° / 58°

88 °

Cupertino, Saturday, 15 August

Clear. High 88°, low 58°.

Pressure29.97 inHg

Wind4.8 mph NW

Humidity26%

Visibility—

Dew point46°

Sun, 1689° / 57°

89 °

Cupertino, Sunday, 16 August

Overcast. High 89°, low 57°.

Pressure30.00 inHg

Wind5.2 mph NW

Humidity23%

Visibility—

Dew point43°

Mon, 1786° / 60°

86 °

Cupertino, Monday, 17 August

Overcast. High 86°, low 60°.

Pressure30.00 inHg

Wind4.9 mph NW

Humidity26%

Visibility—

Dew point44°

Tue, 1885° / 60°

85 °

Cupertino, Tuesday, 18 August

Overcast. High 85°, low 60°.

Pressure30.00 inHg

Wind8 mph N

Humidity27%

Visibility—

Dew point45°

Wed, 1987° / 57°

87 °

Cupertino, Wednesday, 19 August

Clear. High 87°, low 57°.

Pressure29.97 inHg

Wind9 mph NW

Humidity22%

Visibility—

Dew point40°

Thu, 2080° / 56°

80 °

Cupertino, Thursday, 20 August

Overcast. High 80°, low 56°.

Pressure29.91 inHg

Wind6.1 mph NW

Humidity36%

Visibility—

Dew point48°

Fri, 2189° / 56°

89 °

Cupertino, Friday, 21 August

Clear. High 89°, low 56°.

Pressure29.85 inHg

Wind4.9 mph SW

Humidity23%

Visibility—

Dew point43°

Sat, 2286° / 58°

86 °

Cupertino, Saturday, 22 August

Overcast. High 86°, low 58°.

Pressure29.91 inHg

Wind4.4 mph SW

Humidity29%

Visibility—

Dew point47°

Sun, 2388° / 57°

88 °

Cupertino, Sunday, 23 August

Mostly clear. High 88°, low 57°.

Pressure29.91 inHg

Wind5.3 mph NW

Humidity28%

Visibility—

Dew point48°

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

Mon, 2481° / 59°

81 °

Cupertino, Monday, 24 August

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high102° (2010)

Record low53° (1973)

Tue, 2580° / 58°

80 °

Cupertino, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high96° (1988)

Record low54° (1970)

Wed, 2681° / 58°

81 °

Cupertino, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high94° (1999)

Record low53° (1970)

Thu, 2783° / 59°

83 °

Cupertino, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high83°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high97° (1962)

Record low51° (1960)

Fri, 2883° / 60°

83 °

Cupertino, Friday, 28 August

Climate normal for this date — 60-year average.

Average high83°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high100° (2021)

Record low52° (1995)

Sat, 2982° / 59°

82 °

Cupertino, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high82°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high97° (1968)

Record low51° (1980)

Sun, 3080° / 59°

80 °

Cupertino, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high80°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high94° (2007)

Record low51° (2010)

Mon, 3181° / 59°

81 °

Cupertino, Monday, 31 August

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high95° (2025)

Record low53° (2008)

Tue, 0183° / 59°

83 °

Cupertino, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high83°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high108° (2017)

Record low51° (1964)

Wed, 0282° / 60°

82 °

Cupertino, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high82°

Average low60°

Average precipitation0 in

Chance of precipitation3%

Record high109° (2017)

Record low52° (1964)

Thu, 0382° / 60°

82 °

Cupertino, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high82°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2017)

Record low52° (1995)

Fri, 0482° / 60°

82 °

Cupertino, Friday, 4 September

Climate normal for this date — 60-year average.

Average high82°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high98° (1988)

Record low52° (1960)

Sat, 0583° / 60°

83 °

Cupertino, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high83°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2022)

Record low51° (1965)

Sun, 0683° / 60°

83 °

Cupertino, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high83°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high114° (2022)

Record low52° (2001)

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 Cupertino, 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 Cupertino, 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.