Union City, CA vs Phoenix, AZ

Side-by-side comparison of monthly climate normals (NOAA 1991-2020).

Union City is cooler than Phoenix (59.5°F vs 72.5°F annual avg) and wetter than it (15.9 in vs 8.9 in per year). Union City has a Semi-arid (cold) climate; Phoenix a Desert (hot) climate.

Union City, CA

Annual avg
59.5°F
Annual precip
15.9 in
Warmest month
September (78.3°F)
Coldest month
December (42.5°F)
Annual swing
17.2°F
Pleasant months
6 / 12
Semi-arid (cold) BSk USDA Zone 9b

Phoenix, AZ

Annual avg
72.5°F
Annual precip
8.9 in
Warmest month
July (104.0°F)
Coldest month
December (42.7°F)
Annual swing
39.1°F
Pleasant months
2 / 12
Desert (hot) BWh USDA Zone 9b

Best months to visit each city

Union City

J
F
M
A
M
J
J
A
S
O
N
D

Phoenix

J
F
M
A
M
J
J
A
S
O
N
D

Month-by-month comparison

Month Union City Phoenix
High Low Precip High Low Precip
January 58.6°F 42.6°F 3.00 in 65.4°F 44.1°F 1.17 in
February 61.4°F 44.4°F 3.17 in 68.1°F 46.1°F 1.21 in
March 65.1°F 46.4°F 2.52 in 75.0°F 50.9°F 1.09 in
April 67.7°F 48.3°F 1.22 in 82.5°F 56.6°F 0.35 in
May 71.1°F 51.9°F 0.50 in 91.5°F 64.7°F 0.19 in
June 75.3°F 54.7°F 0.16 in 101.5°F 72.7°F 0.03 in
July 77.9°F 56.8°F 0.00 in 104.0°F 80.8°F 0.81 in
August 78.2°F 57.1°F 0.02 in 102.5°F 80.5°F 0.96 in
September 78.3°F 56.0°F 0.10 in 97.5°F 74.7°F 0.71 in
October 73.3°F 52.0°F 0.69 in 86.3°F 62.7°F 0.67 in
November 64.6°F 46.2°F 1.59 in 74.0°F 50.8°F 0.90 in
December 58.4°F 42.5°F 2.97 in 63.9°F 42.7°F 0.81 in
Union City overview
Full climate profile
 Phoenix overview
Full climate profile