As of 12:53 PDT

Weather in Bethel Island, CA

97°

Bethel Island, Sunday, 9 August, 12:53

Clear. Feels like 100°. High 97°, low 62°.

Pressure29.80 inHg

Wind7.2 mph NW

Humidity36%

Visibility6.2 mi

Dew point66°

See detailed hourly forecast

Monthly outlook for Bethel Island, CA: average high 99°, average low 63.3°. That is 7.7° 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 22 August (112.7°), the coolest 14 August (57.1°).

99°/63.3°

Average high / low

+7.7°

Above normal

0 / 0

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	93.9°	85.8°	+4.5°
19 August – 28 August	107.3°	84.8°	+12.5°
29 August – 7 September	at normal	86°	—

August records over 66 years

107.6°16 August 2020All-time high

52.3°29 August 1980All-time low

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

Mon, 1091° / 63°

91 °

Bethel Island, Monday, 10 August

Mostly clear. High 91°, low 63°.

Pressure29.83 inHg

Wind6 mph NW

Humidity16%

Visibility6.2 mi

Dew point42°

Tue, 11102° / 60°

102 °

Bethel Island, Tuesday, 11 August

Clear. High 102°, low 60°.

Pressure29.88 inHg

Wind3.2 mph NW

Humidity18%

Visibility6.2 mi

Dew point44°

Wed, 12100° / 62°

100 °

Bethel Island, Wednesday, 12 August

Clear. High 100°, low 62°.

Pressure29.80 inHg

Wind1.8 mph NW

Humidity20%

Visibility6.2 mi

Dew point45°

Thu, 1390° / 58°

90 °

Bethel Island, Thursday, 13 August

Overcast. High 90°, low 58°.

Pressure29.83 inHg

Wind2.1 mph W

Humidity33%

Visibility6.2 mi

Dew point51°

Fri, 1489° / 57°

89 °

Bethel Island, Friday, 14 August

Clear. High 89°, low 57°.

Pressure29.85 inHg

Wind14.5 mph NW

Humidity26%

Visibility—

Dew point47°

Sat, 1589° / 58°

89 °

Bethel Island, Saturday, 15 August

Overcast. High 89°, low 58°.

Pressure29.97 inHg

Wind15 mph NW

Humidity27%

Visibility—

Dew point47°

Sun, 1690° / 57°

90 °

Bethel Island, Sunday, 16 August

Clear. High 90°, low 57°.

Pressure30.00 inHg

Wind13.6 mph W

Humidity25%

Visibility—

Dew point46°

Mon, 1794° / 57°

94 °

Bethel Island, Monday, 17 August

Clear. High 94°, low 57°.

Pressure29.94 inHg

Wind12.1 mph W

Humidity18%

Visibility—

Dew point41°

Tue, 1897° / 59°

97 °

Bethel Island, Tuesday, 18 August

Clear. High 97°, low 59°.

Pressure29.91 inHg

Wind11.1 mph W

Humidity14%

Visibility—

Dew point36°

Wed, 19101° / 59°

101 °

Bethel Island, Wednesday, 19 August

Overcast. High 101°, low 59°.

Pressure29.88 inHg

Wind11.2 mph NW

Humidity16%

Visibility—

Dew point41°

Thu, 20106° / 65°

106 °

Bethel Island, Thursday, 20 August

Clear. High 106°, low 65°.

Pressure29.85 inHg

Wind12 mph W

Humidity13%

Visibility—

Dew point40°

Fri, 21110° / 74°

110 °

Bethel Island, Friday, 21 August

Clear. High 110°, low 74°.

Pressure29.85 inHg

Wind14 mph W

Humidity12%

Visibility—

Dew point43°

Sat, 22113° / 78°

113 °

Bethel Island, Saturday, 22 August

Overcast. High 113°, low 78°.

Pressure29.77 inHg

Wind16.4 mph W

Humidity12%

Visibility—

Dew point45°

Sun, 23111° / 74°

111 °

Bethel Island, Sunday, 23 August

Clear. High 111°, low 74°.

Pressure29.74 inHg

Wind12.2 mph W

Humidity12%

Visibility—

Dew point44°

Mon, 24103° / 68°

103 °

Bethel Island, Monday, 24 August

Clear. High 103°, low 68°.

Pressure29.80 inHg

Wind12 mph NW

Humidity17%

Visibility—

Dew point47°

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

Tue, 2585° / 59°

85 °

Bethel Island, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high85°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high99° (2010)

Record low54° (1960)

Wed, 2685° / 58°

85 °

Bethel Island, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high85°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high99° (2017)

Record low54° (1970)

Thu, 2786° / 59°

86 °

Bethel Island, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high103° (2017)

Record low53° (1960)

Fri, 2887° / 60°

87 °

Bethel Island, Friday, 28 August

Climate normal for this date — 60-year average.

Average high87°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2021)

Record low54° (1960)

Sat, 2985° / 59°

85 °

Bethel Island, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high85°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high99° (2009)

Record low52° (1980)

Sun, 3085° / 60°

85 °

Bethel Island, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high85°

Average low60°

Average precipitation0 in

Chance of precipitation3%

Record high99° (2025)

Record low53° (2010)

Mon, 3186° / 59°

86 °

Bethel Island, Monday, 31 August

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high100° (2025)

Record low53° (1970)

Tue, 0187° / 59°

87 °

Bethel Island, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high87°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high108° (2017)

Record low53° (1970)

Wed, 0286° / 60°

86 °

Bethel Island, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high86°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high107° (2017)

Record low53° (1960)

Thu, 0386° / 59°

86 °

Bethel Island, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2017)

Record low52° (1970)

Fri, 0486° / 59°

86 °

Bethel Island, Friday, 4 September

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2022)

Record low52° (1960)

Sat, 0586° / 59°

86 °

Bethel Island, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high110° (2022)

Record low52° (2000)

Sun, 0686° / 59°

86 °

Bethel Island, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high86°

Average low59°

Average precipitation0 in

Chance of precipitation2%

Record high113° (2022)

Record low53° (1973)

Mon, 0786° / 60°

86 °

Bethel Island, Monday, 7 September

Climate normal for this date — 60-year average.

Average high86°

Average low60°

Average precipitation0 in

Chance of precipitation0%

Record high111° (2020)

Record low53° (2002)

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 Bethel Island, 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 Bethel Island, 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.