Sunnyvale, CA vs Phoenix, AZ

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

Sunnyvale is cooler than Phoenix (59.9°F vs 72.5°F annual avg) and similar rainfall to it (13.5 in vs 8.9 in per year). Sunnyvale has a Semi-arid (cold) climate; Phoenix a Desert (hot) climate.

Sunnyvale, CA

Annual avg
59.9°F
Annual precip
13.5 in
Warmest month
September (77.7°F)
Coldest month
December (42.1°F)
Annual swing
17.5°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

Sunnyvale

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 Sunnyvale Phoenix
High Low Precip High Low Precip
January 59.0°F 42.4°F 2.49 in 65.4°F 44.1°F 1.17 in
February 61.8°F 44.5°F 2.90 in 68.1°F 46.1°F 1.21 in
March 65.0°F 46.7°F 2.04 in 75.0°F 50.9°F 1.09 in
April 68.0°F 48.9°F 0.98 in 82.5°F 56.6°F 0.35 in
May 71.7°F 52.5°F 0.43 in 91.5°F 64.7°F 0.19 in
June 75.9°F 55.7°F 0.10 in 101.5°F 72.7°F 0.03 in
July 76.9°F 58.5°F 0.00 in 104.0°F 80.8°F 0.81 in
August 76.9°F 59.0°F 0.01 in 102.5°F 80.5°F 0.96 in
September 77.7°F 57.3°F 0.07 in 97.5°F 74.7°F 0.71 in
October 74.1°F 53.1°F 0.56 in 86.3°F 62.7°F 0.67 in
November 65.5°F 46.3°F 1.36 in 74.0°F 50.8°F 0.90 in
December 58.9°F 42.1°F 2.51 in 63.9°F 42.7°F 0.81 in
Sunnyvale overview
Full climate profile
 Phoenix overview
Full climate profile