As of 00:39 PDT

Weather in Union City, CA

57°

Union City, Thursday, 22 October, 00:39

Overcast. Feels like 56°. High 64°, low 54°.

Pressure29.83 inHg

Wind8.1 mph SE

Humidity81%

Visibility6.2 mi

Dew point51°

See detailed hourly forecast

Monthly outlook for Union City, CA: average high 72.3°, average low 55.1°. That is 1.9° above the climate normal for October. Precipitation is expected on 1 day (about 0.0 inches), against a normal of 2 days and 0.7 inches. The warmest day looks like 4 November (79.1°), the coolest 24 October (49°).

72.3°/55.1°

Average high / low

+1.9°

Above normal

1 / 2

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
22 October – 31 October	71.1°	69.6°	+0.8°
1 November – 10 November	74.3°	66.4°	+4.3°
11 November – 20 November	at normal	62.9°	—

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).

Fri, 2370° / 55°

0.01

70 °

Union City, Friday, 23 October

Light rain. High 70°, low 55°.

Pressure30.06 inHg

Wind4.8 mph N

Humidity69%

Visibility6.2 mi

Dew point53°

Sat, 2474° / 49°

74 °

Union City, Saturday, 24 October

Clear. High 74°, low 49°.

Pressure30.00 inHg

Wind2.1 mph NW

Humidity29%

Visibility6.2 mi

Dew point35°

Sun, 2574° / 51°

74 °

Union City, Sunday, 25 October

Clear. High 74°, low 51°.

Pressure30.06 inHg

Wind2.2 mph W

Humidity42%

Visibility6.2 mi

Dew point45°

Mon, 2672° / 53°

72 °

Union City, Monday, 26 October

Overcast. High 72°, low 53°.

Pressure30.15 inHg

Wind6.4 mph W

Humidity60%

Visibility—

Dew point49°

Tue, 2774° / 54°

74 °

Union City, Tuesday, 27 October

Overcast. High 74°, low 54°.

Pressure30.12 inHg

Wind4.5 mph W

Humidity61%

Visibility—

Dew point50°

Wed, 2876° / 58°

76 °

Union City, Wednesday, 28 October

Mostly clear. High 76°, low 58°.

Pressure30.03 inHg

Wind6.5 mph W

Humidity35%

Visibility—

Dew point40°

Thu, 2972° / 57°

72 °

Union City, Thursday, 29 October

Overcast. High 72°, low 57°.

Pressure29.94 inHg

Wind4.6 mph W

Humidity36%

Visibility—

Dew point38°

Fri, 3066° / 56°

66 °

Union City, Friday, 30 October

Partly cloudy. High 66°, low 56°.

Pressure29.85 inHg

Wind8.2 mph W

Humidity69%

Visibility—

Dew point51°

Sat, 3169° / 52°

69 °

Union City, Saturday, 31 October

Partly cloudy. High 69°, low 52°.

Pressure29.88 inHg

Wind7.2 mph W

Humidity56%

Visibility—

Dew point44°

Sun, 0172° / 54°

72 °

Union City, Sunday, 1 November

Clear. High 72°, low 54°.

Pressure30.06 inHg

Wind6.2 mph NW

Humidity46%

Visibility—

Dew point43°

Mon, 0274° / 56°

74 °

Union City, Monday, 2 November

Overcast. High 74°, low 56°.

Pressure30.18 inHg

Wind4.6 mph W

Humidity43%

Visibility—

Dew point43°

Tue, 0378° / 58°

78 °

Union City, Tuesday, 3 November

Clear. High 78°, low 58°.

Pressure30.18 inHg

Wind6.2 mph W

Humidity33%

Visibility—

Dew point39°

Wed, 0479° / 59°

79 °

Union City, Wednesday, 4 November

Clear. High 79°, low 59°.

Pressure30.06 inHg

Wind5.9 mph W

Humidity33%

Visibility—

Dew point40°

Thu, 0579° / 60°

79 °

Union City, Thursday, 5 November

Clear. High 79°, low 60°.

Pressure30.03 inHg

Wind5.5 mph NW

Humidity33%

Visibility—

Dew point41°

Fri, 0664° / 56°

64 °

Union City, Friday, 6 November

Clear. High 64°, low 56°.

Pressure30.09 inHg

Wind5.5 mph NW

Humidity68%

Visibility—

Dew point52°

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

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)

Thu, 1264° / 49°

0.06

64 °

Union City, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.06 in

Chance of precipitation17%

Record high78° (1990)

Record low40° (1978)

Fri, 1364° / 49°

0.13

64 °

Union City, Friday, 13 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.13 in

Chance of precipitation28%

Record high79° (1995)

Record low38° (2000)

Sat, 1464° / 49°

0.06

64 °

Union City, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high64°

Average low49°

Average precipitation0.06 in

Chance of precipitation23%

Record high76° (2008)

Record low37° (1964)

Sun, 1564° / 48°

0.05

64 °

Union City, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high64°

Average low48°

Average precipitation0.05 in

Chance of precipitation18%

Record high77° (2010)

Record low37° (1964)

Mon, 1663° / 49°

0.09

63 °

Union City, Monday, 16 November

Climate normal for this date — 60-year average.

Average high63°

Average low49°

Average precipitation0.09 in

Chance of precipitation23%

Record high76° (2008)

Record low37° (1964)

Tue, 1763° / 49°

0.11

63 °

Union City, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high63°

Average low49°

Average precipitation0.11 in

Chance of precipitation25%

Record high76° (2008)

Record low37° (1964)

Wed, 1862° / 48°

0.07

62 °

Union City, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high62°

Average low48°

Average precipitation0.07 in

Chance of precipitation20%

Record high74° (1989)

Record low37° (1994)

Thu, 1961° / 47°

0.04

61 °

Union City, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high61°

Average low47°

Average precipitation0.04 in

Chance of precipitation25%

Record high74° (1989)

Record low36° (1977)

Fri, 2062° / 47°

0.1

62 °

Union City, Friday, 20 November

Climate normal for this date — 60-year average.

Average high62°

Average low47°

Average precipitation0.1 in

Chance of precipitation25%

Record high75° (1989)

Record low36° (1964)

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.