As of 13:41 PDT

Weather in Union City, CA

74°

Union City, Tuesday, 13 October, 13:41

Clear. Feels like 72°. High 74°, low 48°.

Pressure30.06 inHg

Wind16.1 mph NE

Humidity21%

Visibility6.2 mi

Dew point32°

See detailed hourly forecast

Monthly outlook for Union City, CA: average high 72.5°, average low 52.8°. That is 0.3° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 2 days and 0.6 inches. The warmest day looks like 16 October (88.8°), the coolest 13 October (47.6°).

72.5°/52.8°

Average high / low

+0.3°

Above normal

1 / 2

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
13 October – 22 October	73.8°	72.9°	+0.5°
23 October – 1 November	70.3°	69.4°	+0.5°
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, 1478° / 50°

78 °

Union City, Wednesday, 14 October

Clear. High 78°, low 50°.

Pressure30.12 inHg

Wind2.9 mph W

Humidity30%

Visibility6.2 mi

Dew point39°

Thu, 1587° / 51°

87 °

Union City, Thursday, 15 October

Clear. High 87°, low 51°.

Pressure30.12 inHg

Wind0.7 mph W

Humidity23%

Visibility6.2 mi

Dew point38°

Fri, 1689° / 55°

89 °

Union City, Friday, 16 October

Clear. High 89°, low 55°.

Pressure30.03 inHg

Wind0.5 mph S

Humidity16%

Visibility6.2 mi

Dew point34°

Sat, 1783° / 61°

83 °

Union City, Saturday, 17 October

Clear. High 83°, low 61°.

Pressure30.00 inHg

Wind3.6 mph W

Humidity29%

Visibility6.2 mi

Dew point44°

Sun, 1866° / 58°

66 °

Union City, Sunday, 18 October

Mostly clear. High 66°, low 58°.

Pressure30.03 inHg

Wind10.2 mph W

Humidity70%

Visibility—

Dew point54°

Mon, 1964° / 56°

64 °

Union City, Monday, 19 October

Light rain. High 64°, low 56°.

Pressure30.00 inHg

Wind10.8 mph W

Humidity52%

Visibility—

Dew point44°

Tue, 2064° / 53°

0.13

64 °

Union City, Tuesday, 20 October

Light rain. High 64°, low 53°.

Pressure29.94 inHg

Wind10.4 mph W

Humidity60%

Visibility—

Dew point45°

Wed, 2166° / 52°

66 °

Union City, Wednesday, 21 October

Clear. High 66°, low 52°.

Pressure30.06 inHg

Wind8.1 mph W

Humidity56%

Visibility—

Dew point45°

Thu, 2267° / 52°

67 °

Union City, Thursday, 22 October

Clear. High 67°, low 52°.

Pressure30.06 inHg

Wind7.8 mph W

Humidity52%

Visibility—

Dew point43°

Fri, 2367° / 52°

67 °

Union City, Friday, 23 October

Clear. High 67°, low 52°.

Pressure30.06 inHg

Wind9.8 mph W

Humidity43%

Visibility—

Dew point38°

Sat, 2466° / 49°

66 °

Union City, Saturday, 24 October

Clear. High 66°, low 49°.

Pressure30.18 inHg

Wind9.2 mph W

Humidity37%

Visibility—

Dew point32°

Sun, 2570° / 49°

70 °

Union City, Sunday, 25 October

Clear. High 70°, low 49°.

Pressure30.21 inHg

Wind7.3 mph W

Humidity27%

Visibility—

Dew point27°

Mon, 2673° / 53°

73 °

Union City, Monday, 26 October

Clear. High 73°, low 53°.

Pressure30.06 inHg

Wind8.2 mph W

Humidity23%

Visibility—

Dew point26°

Tue, 2772° / 52°

72 °

Union City, Tuesday, 27 October

Clear. High 72°, low 52°.

Pressure30.03 inHg

Wind4.9 mph N

Humidity22%

Visibility—

Dew point23°

Wed, 2873° / 54°

73 °

Union City, Wednesday, 28 October

Partly cloudy. High 73°, low 54°.

Pressure30.15 inHg

Wind3.3 mph E

Humidity21%

Visibility—

Dew point24°

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.