As of 03:38 PDT

Weather in Union City, CA

51°

Union City, Tuesday, 13 October, 03:38

Overcast. Feels like 49°. High 75°, low 49°.

Pressure30.00 inHg

Wind6.9 mph NE

Humidity83%

Visibility4.8 mi

Dew point46°

See detailed hourly forecast

Monthly outlook for Union City, CA: average high 74.7°, average low 53.7°. That is 1.6° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 2 days and 0.6 inches. The warmest day looks like 16 October (88.9°), the coolest 13 October (48.7°).

74.7°/53.7°

Average high / low

+1.6°

Above normal

0 / 2

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
13 October – 22 October	74.6°	72.9°	+1°
23 October – 1 November	74.9°	69.4°	+3.1°
2 November – 11 November	at normal	65.9°	—

October records over 66 years

100.6°6 October 2024All-time high

40.3°29 October 1971All-time low

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

Wed, 1476° / 49°

76 °

Union City, Wednesday, 14 October

Clear. High 76°, low 49°.

Pressure30.12 inHg

Wind2.9 mph W

Humidity35%

Visibility6.2 mi

Dew point42°

Thu, 1587° / 54°

87 °

Union City, Thursday, 15 October

Clear. High 87°, low 54°.

Pressure30.09 inHg

Wind1 mph W

Humidity26%

Visibility6.2 mi

Dew point40°

Fri, 1689° / 56°

89 °

Union City, Friday, 16 October

Clear. High 89°, low 56°.

Pressure30.03 inHg

Wind0.3 mph S

Humidity17%

Visibility6.2 mi

Dew point35°

Sat, 1782° / 60°

82 °

Union City, Saturday, 17 October

Clear. High 82°, low 60°.

Pressure30.03 inHg

Wind6.4 mph W

Humidity39%

Visibility—

Dew point47°

Sun, 1866° / 56°

66 °

Union City, Sunday, 18 October

Partly cloudy. High 66°, low 56°.

Pressure30.03 inHg

Wind8.7 mph W

Humidity71%

Visibility—

Dew point54°

Mon, 1963° / 53°

0.01

63 °

Union City, Monday, 19 October

Light rain. High 63°, low 53°.

Pressure30.03 inHg

Wind14.3 mph W

Humidity74%

Visibility—

Dew point51°

Tue, 2064° / 49°

64 °

Union City, Tuesday, 20 October

Clear. High 64°, low 49°.

Pressure30.06 inHg

Wind10.8 mph NW

Humidity50%

Visibility—

Dew point40°

Wed, 2171° / 51°

71 °

Union City, Wednesday, 21 October

Clear. High 71°, low 51°.

Pressure30.09 inHg

Wind10.1 mph W

Humidity32%

Visibility—

Dew point32°

Thu, 2273° / 53°

73 °

Union City, Thursday, 22 October

Clear. High 73°, low 53°.

Pressure30.12 inHg

Wind7.2 mph W

Humidity28%

Visibility—

Dew point31°

Fri, 2375° / 54°

75 °

Union City, Friday, 23 October

Clear. High 75°, low 54°.

Pressure30.09 inHg

Wind9.6 mph N

Humidity27%

Visibility—

Dew point30°

Sat, 2474° / 53°

74 °

Union City, Saturday, 24 October

Clear. High 74°, low 53°.

Pressure30.18 inHg

Wind7.2 mph NE

Humidity21%

Visibility—

Dew point23°

Sun, 2576° / 55°

76 °

Union City, Sunday, 25 October

Clear. High 76°, low 55°.

Pressure30.09 inHg

Wind5.7 mph NW

Humidity18%

Visibility—

Dew point23°

Mon, 2676° / 55°

76 °

Union City, Monday, 26 October

Mostly clear. High 76°, low 55°.

Pressure29.77 inHg

Wind22.8 mph NE

Humidity15%

Visibility—

Dew point16°

Tue, 2776° / 54°

76 °

Union City, Tuesday, 27 October

Clear. High 76°, low 54°.

Pressure29.68 inHg

Wind9.8 mph W

Humidity22%

Visibility—

Dew point26°

Wed, 2872° / 58°

72 °

Union City, Wednesday, 28 October

Overcast. High 72°, low 58°.

Pressure29.94 inHg

Wind10.6 mph W

Humidity36%

Visibility—

Dew point38°

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

Thu, 2968° / 51°

0.05

68 °

Union City, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high68°

Average low51°

Average precipitation0.05 in

Chance of precipitation17%

Record high83° (1965)

Record low40° (1971)

Fri, 3067° / 51°

0.06

67 °

Union City, Friday, 30 October

Climate normal for this date — 60-year average.

Average high67°

Average low51°

Average precipitation0.06 in

Chance of precipitation17%

Record high82° (1966)

Record low41° (2023)

Sat, 3169° / 51°

0.02

69 °

Union City, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high69°

Average low51°

Average precipitation0.02 in

Chance of precipitation12%

Record high81° (1966)

Record low41° (2023)

Sun, 0169° / 51°

0.03

69 °

Union City, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high69°

Average low51°

Average precipitation0.03 in

Chance of precipitation10%

Record high83° (1967)

Record low42° (2023)

Mon, 0268° / 51°

0.03

68 °

Union City, Monday, 2 November

Climate normal for this date — 60-year average.

Average high68°

Average low51°

Average precipitation0.03 in

Chance of precipitation12%

Record high83° (1967)

Record low43° (2019)

Tue, 0368° / 51°

0.03

68 °

Union City, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high68°

Average low51°

Average precipitation0.03 in

Chance of precipitation13%

Record high81° (1976)

Record low41° (1994)

Wed, 0467° / 51°

0.02

67 °

Union City, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high67°

Average low51°

Average precipitation0.02 in

Chance of precipitation8%

Record high82° (1976)

Record low43° (2011)

Thu, 0566° / 51°

0.05

66 °

Union City, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high66°

Average low51°

Average precipitation0.05 in

Chance of precipitation15%

Record high82° (1976)

Record low43° (2011)

Fri, 0666° / 51°

0.04

66 °

Union City, Friday, 6 November

Climate normal for this date — 60-year average.

Average high66°

Average low51°

Average precipitation0.04 in

Chance of precipitation17%

Record high82° (1976)

Record low44° (1998)

Sat, 0766° / 51°

0.06

66 °

Union City, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high66°

Average low51°

Average precipitation0.06 in

Chance of precipitation23%

Record high80° (1991)

Record low41° (2024)

Sun, 0865° / 49°

0.07

65 °

Union City, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high65°

Average low49°

Average precipitation0.07 in

Chance of precipitation20%

Record high79° (1978)

Record low42° (1982)

Mon, 0964° / 49°

0.07

64 °

Union City, Monday, 9 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.07 in

Chance of precipitation22%

Record high78° (1976)

Record low37° (2020)

Tue, 1064° / 49°

0.09

64 °

Union City, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.09 in

Chance of precipitation28%

Record high78° (1990)

Record low38° (2020)

Wed, 1164° / 49°

0.08

64 °

Union City, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.08 in

Chance of precipitation23%

Record high79° (1990)

Record low40° (1985)

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.