San Diego, CA vs Phoenix, AZ

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

San Diego is cooler than Phoenix (64.1°F vs 72.5°F annual avg) and similar rainfall to it (11 in vs 8.9 in per year). San Diego has a Semi-arid (cold) climate; Phoenix a Desert (hot) climate.

San Diego, CA

Annual avg
64.1°F
Annual precip
11 in
Warmest month
August (82.0°F)
Coldest month
December (45.3°F)
Annual swing
17.4°F
Pleasant months
6 / 12
Semi-arid (cold) BSk USDA Zone 10a

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

San Diego

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 San Diego Phoenix
High Low Precip High Low Precip
January 67.3°F 46.0°F 2.32 in 65.4°F 44.1°F 1.17 in
February 67.3°F 46.9°F 2.65 in 68.1°F 46.1°F 1.21 in
March 68.5°F 49.6°F 1.63 in 75.0°F 50.9°F 1.09 in
April 70.7°F 52.4°F 0.77 in 82.5°F 56.6°F 0.35 in
May 72.1°F 56.6°F 0.28 in 91.5°F 64.7°F 0.19 in
June 74.7°F 60.0°F 0.06 in 101.5°F 72.7°F 0.03 in
July 79.8°F 64.0°F 0.07 in 104.0°F 80.8°F 0.81 in
August 82.0°F 65.3°F 0.01 in 102.5°F 80.5°F 0.96 in
September 81.4°F 63.6°F 0.17 in 97.5°F 74.7°F 0.71 in
October 77.8°F 57.8°F 0.54 in 86.3°F 62.7°F 0.67 in
November 72.7°F 50.1°F 0.91 in 74.0°F 50.8°F 0.90 in
December 67.3°F 45.3°F 1.61 in 63.9°F 42.7°F 0.81 in
San Diego overview
Full climate profile
 Phoenix overview
Full climate profile