As of 18:44 PDT

Weather in Diablo, CA

77°

Diablo, Saturday, 8 August, 18:44

Clear. Feels like 77°. High 86°, low 60°.

Pressure29.85 inHg

Wind6.9 mph SW

Humidity43%

Visibility6.2 mi

Dew point53°

See detailed hourly forecast

Monthly outlook for Diablo, CA: average high 86.6°, average low 57.5°. That is 1.9° 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°), the coolest 20 August (53.7°).

86.6°/57.5°

Average high / low

+1.9°

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	88.1°	83.8°	+2.4°
18 August – 27 August	84.2°	82.6°	+0.9°
28 August – 6 September	at normal	84.6°	—

August records over 66 years

104.4°16 August 2020All-time high

51.6°10 August 1960All-time low

Climate normals and records are computed from the nearest reference point — Concord (9 mi).

Sun, 0992° / 61°

92 °

Diablo, Sunday, 9 August

Clear. High 92°, low 61°.

Pressure29.80 inHg

Wind3.9 mph W

Humidity14%

Visibility6.2 mi

Dew point41°

Mon, 1096° / 62°

96 °

Diablo, Monday, 10 August

Overcast. High 96°, low 62°.

Pressure29.85 inHg

Wind5.5 mph SW

Humidity19%

Visibility6.2 mi

Dew point43°

Tue, 1195° / 60°

95 °

Diablo, Tuesday, 11 August

Clear. High 95°, low 60°.

Pressure29.88 inHg

Wind4.7 mph SW

Humidity18%

Visibility6.2 mi

Dew point42°

Wed, 1291° / 61°

91 °

Diablo, Wednesday, 12 August

Overcast. High 91°, low 61°.

Pressure29.83 inHg

Wind5.7 mph SW

Humidity23%

Visibility6.2 mi

Dew point46°

Thu, 1385° / 59°

85 °

Diablo, Thursday, 13 August

Overcast. High 85°, low 59°.

Pressure29.80 inHg

Wind9.8 mph SW

Humidity29%

Visibility—

Dew point46°

Fri, 1484° / 57°

84 °

Diablo, Friday, 14 August

Clear. High 84°, low 57°.

Pressure29.91 inHg

Wind9.5 mph W

Humidity30%

Visibility—

Dew point47°

Sat, 1586° / 57°

86 °

Diablo, Saturday, 15 August

Clear. High 86°, low 57°.

Pressure30.00 inHg

Wind9.7 mph W

Humidity28%

Visibility—

Dew point46°

Sun, 1685° / 57°

85 °

Diablo, Sunday, 16 August

Overcast. High 85°, low 57°.

Pressure30.03 inHg

Wind10 mph W

Humidity27%

Visibility—

Dew point44°

Mon, 1782° / 58°

82 °

Diablo, Monday, 17 August

Overcast. High 82°, low 58°.

Pressure30.03 inHg

Wind8.6 mph W

Humidity29%

Visibility—

Dew point44°

Tue, 1883° / 57°

83 °

Diablo, Tuesday, 18 August

Overcast. High 83°, low 57°.

Pressure30.00 inHg

Wind10.1 mph SW

Humidity25%

Visibility—

Dew point41°

Wed, 1986° / 55°

86 °

Diablo, Wednesday, 19 August

Clear. High 86°, low 55°.

Pressure29.94 inHg

Wind9.1 mph SW

Humidity22%

Visibility—

Dew point40°

Thu, 2079° / 54°

79 °

Diablo, Thursday, 20 August

Overcast. High 79°, low 54°.

Pressure29.91 inHg

Wind8.4 mph SW

Humidity35%

Visibility—

Dew point46°

Fri, 2189° / 55°

89 °

Diablo, Friday, 21 August

Partly cloudy. High 89°, low 55°.

Pressure29.83 inHg

Wind7.9 mph SW

Humidity21%

Visibility—

Dew point41°

Sat, 2282° / 55°

82 °

Diablo, Saturday, 22 August

Overcast. High 82°, low 55°.

Pressure29.91 inHg

Wind9.2 mph W

Humidity33%

Visibility—

Dew point47°

Sun, 2386° / 55°

86 °

Diablo, Sunday, 23 August

Clear. High 86°, low 55°.

Pressure29.91 inHg

Wind8.1 mph W

Humidity28%

Visibility—

Dew point46°

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

Mon, 2483° / 58°

83 °

Diablo, Monday, 24 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2010)

Record low53° (1970)

Tue, 2583° / 58°

83 °

Diablo, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high98° (1988)

Record low54° (1970)

Wed, 2683° / 57°

83 °

Diablo, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high99° (2017)

Record low53° (1970)

Thu, 2785° / 58°

85 °

Diablo, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high104° (2017)

Record low53° (1960)

Fri, 2885° / 58°

85 °

Diablo, Friday, 28 August

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2021)

Record low53° (1960)

Sat, 2984° / 58°

84 °

Diablo, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high84°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high99° (1977)

Record low53° (1980)

Sun, 3083° / 58°

83 °

Diablo, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0 in

Chance of precipitation3%

Record high99° (2023)

Record low53° (2010)

Mon, 3184° / 58°

84 °

Diablo, Monday, 31 August

Climate normal for this date — 60-year average.

Average high84°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high98° (2025)

Record low52° (1970)

Tue, 0185° / 58°

85 °

Diablo, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high108° (2017)

Record low52° (1973)

Wed, 0285° / 58°

85 °

Diablo, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high107° (2017)

Record low53° (1960)

Thu, 0384° / 58°

84 °

Diablo, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high84°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high98° (2024)

Record low51° (2000)

Fri, 0485° / 58°

85 °

Diablo, Friday, 4 September

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high103° (2022)

Record low52° (1960)

Sat, 0585° / 58°

85 °

Diablo, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high111° (2022)

Record low52° (2000)

Sun, 0685° / 58°

85 °

Diablo, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high111° (2022)

Record low52° (1980)

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 Diablo, 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 Diablo, 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.