As of 18:58 PDT

Weather in Castle Hill, CA

70°

Castle Hill, Saturday, 8 August, 18:58

Clear. Feels like 70°. High 87°, low 61°.

Pressure29.85 inHg

Wind3 mph W

Humidity64%

Visibility6.2 mi

Dew point58°

See detailed hourly forecast

Monthly outlook for Castle Hill, CA: average high 82.9°, average low 59.5°. That is 0.1° below 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 9 August (92.4°), the coolest 20 August (57.4°).

82.9°/59.5°

Average high / low

−0.1°

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	84.6°	83.8°	+0.4°
18 August – 27 August	80.1°	82.6°	-1.4°
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 (8 mi).

Sun, 0992° / 62°

92 °

Castle Hill, Sunday, 9 August

Clear. High 92°, low 62°.

Pressure29.83 inHg

Wind4.7 mph W

Humidity22%

Visibility6.2 mi

Dew point45°

Mon, 1089° / 62°

89 °

Castle Hill, Monday, 10 August

Overcast. High 89°, low 62°.

Pressure29.85 inHg

Wind5.4 mph W

Humidity29%

Visibility6.2 mi

Dew point47°

Tue, 1189° / 60°

89 °

Castle Hill, Tuesday, 11 August

Clear. High 89°, low 60°.

Pressure29.91 inHg

Wind4.7 mph W

Humidity28%

Visibility6.2 mi

Dew point46°

Wed, 1285° / 61°

85 °

Castle Hill, Wednesday, 12 August

Overcast. High 85°, low 61°.

Pressure29.83 inHg

Wind5.5 mph W

Humidity33%

Visibility6.2 mi

Dew point49°

Thu, 1382° / 60°

82 °

Castle Hill, Thursday, 13 August

Overcast. High 82°, low 60°.

Pressure29.83 inHg

Wind10.7 mph W

Humidity37%

Visibility—

Dew point51°

Fri, 1480° / 59°

80 °

Castle Hill, Friday, 14 August

Clear. High 80°, low 59°.

Pressure29.91 inHg

Wind10.4 mph W

Humidity39%

Visibility—

Dew point51°

Sat, 1581° / 59°

81 °

Castle Hill, Saturday, 15 August

Clear. High 81°, low 59°.

Pressure30.00 inHg

Wind10.1 mph W

Humidity36%

Visibility—

Dew point50°

Sun, 1681° / 59°

81 °

Castle Hill, Sunday, 16 August

Overcast. High 81°, low 59°.

Pressure30.03 inHg

Wind9.6 mph W

Humidity33%

Visibility—

Dew point47°

Mon, 1778° / 61°

78 °

Castle Hill, Monday, 17 August

Overcast. High 78°, low 61°.

Pressure30.03 inHg

Wind9 mph W

Humidity39%

Visibility—

Dew point49°

Tue, 1880° / 60°

80 °

Castle Hill, Tuesday, 18 August

Partly cloudy. High 80°, low 60°.

Pressure30.03 inHg

Wind9.4 mph SW

Humidity34%

Visibility—

Dew point47°

Wed, 1981° / 57°

81 °

Castle Hill, Wednesday, 19 August

Clear. High 81°, low 57°.

Pressure29.97 inHg

Wind8.3 mph SW

Humidity32%

Visibility—

Dew point46°

Thu, 2077° / 57°

77 °

Castle Hill, Thursday, 20 August

Overcast. High 77°, low 57°.

Pressure29.91 inHg

Wind8.6 mph SW

Humidity41%

Visibility—

Dew point49°

Fri, 2184° / 58°

84 °

Castle Hill, Friday, 21 August

Mostly clear. High 84°, low 58°.

Pressure29.85 inHg

Wind8.6 mph W

Humidity32%

Visibility—

Dew point49°

Sat, 2277° / 58°

77 °

Castle Hill, Saturday, 22 August

Overcast. High 77°, low 58°.

Pressure29.94 inHg

Wind10.8 mph W

Humidity44%

Visibility—

Dew point52°

Sun, 2381° / 58°

81 °

Castle Hill, Sunday, 23 August

Mostly clear. High 81°, low 58°.

Pressure29.91 inHg

Wind8.4 mph W

Humidity37%

Visibility—

Dew point50°

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

Mon, 2483° / 58°

83 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 °

Castle Hill, 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 Castle Hill, 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 Castle Hill, 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.