South San Francisco, CA vs Phoenix, AZ

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

South San Francisco is cooler than Phoenix (58.7°F vs 72.5°F annual avg) and wetter than it (19.6 in vs 8.9 in per year). South San Francisco has a Warm-summer Mediterranean climate; Phoenix a Desert (hot) climate.

South San Francisco, CA

Annual avg
58.7°F
Annual precip
19.6 in
Warmest month
September (74.8°F)
Coldest month
January (44.5°F)
Annual swing
14°F
Pleasant months
6 / 12
Warm-summer Mediterranean Csb 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

South San Francisco

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 South San Francisco Phoenix
High Low Precip High Low Precip
January 58.0°F 44.5°F 3.89 in 65.4°F 44.1°F 1.17 in
February 60.8°F 46.1°F 3.96 in 68.1°F 46.1°F 1.21 in
March 63.4°F 47.6°F 2.73 in 75.0°F 50.9°F 1.09 in
April 65.6°F 49.1°F 1.36 in 82.5°F 56.6°F 0.35 in
May 68.3°F 51.6°F 0.48 in 91.5°F 64.7°F 0.19 in
June 71.5°F 53.6°F 0.14 in 101.5°F 72.7°F 0.03 in
July 72.6°F 55.3°F 0.00 in 104.0°F 80.8°F 0.81 in
August 73.4°F 56.4°F 0.04 in 102.5°F 80.5°F 0.96 in
September 74.8°F 55.9°F 0.07 in 97.5°F 74.7°F 0.71 in
October 72.3°F 53.4°F 0.79 in 86.3°F 62.7°F 0.67 in
November 64.3°F 48.5°F 2.04 in 74.0°F 50.8°F 0.90 in
December 58.2°F 44.6°F 4.14 in 63.9°F 42.7°F 0.81 in
South San Francisco overview
Full climate profile
 Phoenix overview
Full climate profile