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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Union City, CA
Content continues below
May
Average Temperature
High
21°
Feels 21
Low
10°
Feels 9
Average Precipitation
3 Days
Rain amount
8.2mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
16°
6
19°
7
19°
8
19°
9
22°
10
23°
11
27°
12
26°
13
21°
14
20°
15
20°
16
21°
17
21°
18
20°
19
19°
20
21
22
23
24
25
26
27
28
29
30
31
Forecast
Tuesday, May 5, 2026
Day
16°
Feels 16
Wind
11 km/h W
Gust
16 km/h
Humidity
68%
P.O.P
40%
Rain
<1 mm
Night
12°
Feels 12
Wind
11 km/h W
Gust
16 km/h
Humidity
89%
P.O.P
30%
Historical Averages
May 5
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.