Union City, California Climate
United States
Pop. 74,494 Elev. 19 m / 62 ft
TZ: America/Los_Angeles (UTC-7) ·
Union City is largely arid, with warm summers peaking at 81°F (27°C) in August and cool winters around 41°F (5°C) in January. Precipitation occurs on roughly 23 days per year (15.9 in / 403 mm total). The city averages 165 sunny days per year. Ocean water temperatures reach 62°F (17°C) in summer.
| Temperature | 81°F (27°C) high | 41°F (5°C) low |
| Feels like | 83°F (29°C) high | 41°F (5°C) low |
| Rain | 23 days | 15.9 in (403 mm) /yr |
| Sky | 165 sunny | 16 stormy |
| Wind | 2.5 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jan, Apr, May, Jun, Jul, Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
35
Jan 67
Feb 61
Mar 55
Apr 34
May 25
Jun 36
Jul 28
Aug 42
Sep 39
Oct 57
Nov 56
Dec Humidity (%)
68
Jan 76
Feb 75
Mar 74
Apr 68
May 66
Jun 68
Jul 67
Aug 69
Sep 73
Oct 81
Nov 86
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 14 mi San Francisco Bay Oakland International Airport (OAK)
Ski resort 120 mi Leland Snowplay
National park 25 mi Sky Ridge
Mountain peak
(5,082 ft) 92 mi Chews Ridge
Hospital 3 mi Washington Hospital
Hiking trail 6 mi Cook Canyon Train
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 61°F 16°C | 41°F 5°C | 0.3 in 8 mm | — | 17 |
| February | 61°F 16°C | 45°F 7°C | 4.4 in 113 mm | — | 5 |
| March | 63°F 17°C | 46°F 8°C | 3.3 in 83 mm | — | 7 |
| April | 67°F 19°C | 49°F 10°C | 1.0 in 25 mm | — | 8 |
| May | 73°F 23°C | 52°F 11°C | 0.1 in 4 mm | — | 17 |
| June | 75°F 24°C | 55°F 13°C | 0.0 in 0 mm | — | 24 |
| July | 77°F 25°C | 58°F 14°C | 0.0 in 1 mm | — | 18 |
| August | 81°F 27°C | 59°F 15°C | 0.1 in 3 mm | — | 23 |
| September | 80°F 27°C | 62°F 17°C | 0.2 in 6 mm | — | 13 |
| October | 72°F 22°C | 54°F 12°C | 1.3 in 33 mm | — | 16 |
| November | 65°F 18°C | 51°F 11°C | 3.0 in 76 mm | — | 8 |
| December | 58°F 14°C | 46°F 8°C | 2.1 in 53 mm | — | 9 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 17 | 0 |
| February | 5 | 4 |
| March | 7 | 4 |
| April | 8 | 1 |
| May | 17 | 0 |
| June | 24 | 0 |
| July | 18 | 0 |
| August | 23 | 0 |
| September | 13 | 0 |
| October | 16 | 2 |
| November | 8 | 2 |
| December | 9 | 3 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 53°F 12°C | 50°F 10°C |
| February | 54°F 12°C | 51°F 10°C |
| March | 55°F 13°C | 54°F 12°C |
| April | 56°F 13°C | 60°F 16°C |
| May | 55°F 13°C | 65°F 18°C |
| June | 57°F 14°C | 69°F 21°C |
| July | 60°F 16°C | 71°F 22°C |
| August | 61°F 16°C | 73°F 23°C |
| September | 62°F 17°C | 73°F 23°C |
| October | 62°F 17°C | 66°F 19°C |
| November | 58°F 14°C | 60°F 16°C |
| December | 56°F 14°C | 54°F 12°C |