As of 14:52 PDT

Weather in Union City, CA

79°

Union City, Saturday, 8 August, 14:52

Mostly clear. Feels like 79°. High 81°, low 60°.

Pressure29.91 inHg

Wind7.7 mph W

Humidity69%

Visibility6.2 mi

Dew point68°

See detailed hourly forecast

Monthly outlook for Union City, CA: average high 83.3°, average low 60.2°. That is 2.6° 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 9 August (91.5°), the coolest 18 August (58.2°).

83.3°/60.2°

Average high / low

+2.6°

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	83.7°	79.1°	+2.5°
18 August – 27 August	82.5°	78.3°	+2.4°
28 August – 6 September	at normal	80.1°	—

August records over 66 years

102.2°1 August 1993All-time high

51.4°6 August 2002All-time low

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

Sun, 0991° / 63°

91 °

Union City, Sunday, 9 August

Clear. High 91°, low 63°.

Pressure29.80 inHg

Wind4.7 mph W

Humidity25%

Visibility6.2 mi

Dew point45°

Mon, 1084° / 60°

84 °

Union City, Monday, 10 August

Overcast. High 84°, low 60°.

Pressure29.85 inHg

Wind4.6 mph W

Humidity31%

Visibility6.2 mi

Dew point48°

Tue, 1186° / 60°

86 °

Union City, Tuesday, 11 August

Clear. High 86°, low 60°.

Pressure29.91 inHg

Wind4.1 mph W

Humidity31%

Visibility6.2 mi

Dew point48°

Wed, 1286° / 61°

86 °

Union City, Wednesday, 12 August

Partly cloudy. High 86°, low 61°.

Pressure29.85 inHg

Wind3.7 mph SW

Humidity33%

Visibility6.2 mi

Dew point49°

Thu, 1384° / 60°

84 °

Union City, Thursday, 13 August

Partly cloudy. High 84°, low 60°.

Pressure29.80 inHg

Wind7.2 mph W

Humidity32%

Visibility—

Dew point49°

Fri, 1480° / 63°

80 °

Union City, Friday, 14 August

Overcast. High 80°, low 63°.

Pressure29.91 inHg

Wind8.8 mph NW

Humidity42%

Visibility—

Dew point50°

Sat, 1581° / 60°

81 °

Union City, Saturday, 15 August

Clear. High 81°, low 60°.

Pressure30.00 inHg

Wind11.2 mph NW

Humidity35%

Visibility—

Dew point49°

Sun, 1683° / 58°

83 °

Union City, Sunday, 16 August

Overcast. High 83°, low 58°.

Pressure30.00 inHg

Wind8.7 mph NW

Humidity30%

Visibility—

Dew point45°

Mon, 1780° / 61°

80 °

Union City, Monday, 17 August

Overcast. High 80°, low 61°.

Pressure30.06 inHg

Wind8.7 mph NW

Humidity34%

Visibility—

Dew point47°

Tue, 1885° / 58°

85 °

Union City, Tuesday, 18 August

Clear. High 85°, low 58°.

Pressure30.00 inHg

Wind8 mph W

Humidity25%

Visibility—

Dew point42°

Wed, 1980° / 59°

80 °

Union City, Wednesday, 19 August

Clear. High 80°, low 59°.

Pressure29.97 inHg

Wind8.5 mph W

Humidity33%

Visibility—

Dew point46°

Thu, 2081° / 61°

81 °

Union City, Thursday, 20 August

Clear. High 81°, low 61°.

Pressure29.94 inHg

Wind8 mph NW

Humidity40%

Visibility—

Dew point52°

Fri, 2187° / 60°

87 °

Union City, Friday, 21 August

Clear. High 87°, low 60°.

Pressure29.85 inHg

Wind8.8 mph NW

Humidity29%

Visibility—

Dew point48°

Sat, 2284° / 61°

84 °

Union City, Saturday, 22 August

Overcast. High 84°, low 61°.

Pressure29.83 inHg

Wind8.4 mph NW

Humidity34%

Visibility—

Dew point50°

Sun, 2379° / 59°

79 °

Union City, Sunday, 23 August

Overcast. High 79°, low 59°.

Pressure29.88 inHg

Wind8.4 mph W

Humidity42%

Visibility—

Dew point51°

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

Mon, 2479° / 58°

79 °

Union City, Monday, 24 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2010)

Record low53° (1970)

Tue, 2578° / 58°

78 °

Union City, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high78°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high95° (2010)

Record low53° (1960)

Wed, 2679° / 58°

79 °

Union City, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high93° (1988)

Record low53° (1970)

Thu, 2780° / 58°

80 °

Union City, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high97° (1993)

Record low53° (2012)

Fri, 2881° / 59°

81 °

Union City, Friday, 28 August

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high98° (2008)

Record low52° (1995)

Sat, 2979° / 58°

79 °

Union City, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high97° (1968)

Record low52° (1975)

Sun, 3079° / 58°

79 °

Union City, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0 in

Chance of precipitation5%

Record high93° (1968)

Record low52° (1975)

Mon, 3179° / 58°

79 °

Union City, Monday, 31 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high92° (2005)

Record low53° (1975)

Tue, 0181° / 58°

81 °

Union City, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high81°

Average low58°

Average precipitation0 in

Chance of precipitation3%

Record high101° (2017)

Record low52° (1999)

Wed, 0281° / 59°

81 °

Union City, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high103° (2017)

Record low53° (1995)

Thu, 0380° / 58°

80 °

Union City, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high95° (2008)

Record low52° (2024)

Fri, 0480° / 58°

80 °

Union City, Friday, 4 September

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high96° (2008)

Record low51° (2000)

Sat, 0581° / 58°

81 °

Union City, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high81°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high97° (2008)

Record low53° (1970)

Sun, 0681° / 59°

81 °

Union City, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2022)

Record low53° (1973)

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 Union City, 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 Union City, 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.