San Marcos, CA vs Phoenix, AZ

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

San Marcos is cooler than Phoenix (65.8°F vs 72.5°F annual avg) and wetter than it (14.5 in vs 8.9 in per year). San Marcos has a Semi-arid (hot) climate; Phoenix a Desert (hot) climate.

San Marcos, CA

Annual avg
65.8°F
Annual precip
14.5 in
Warmest month
August (89.0°F)
Coldest month
December (43.8°F)
Annual swing
21.3°F
Pleasant months
2 / 12
Semi-arid (hot) BSh 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

San Marcos

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 Marcos Phoenix
High Low Precip High Low Precip
January 68.8°F 44.8°F 3.19 in 65.4°F 44.1°F 1.17 in
February 68.7°F 45.9°F 3.57 in 68.1°F 46.1°F 1.21 in
March 71.0°F 48.9°F 2.20 in 75.0°F 50.9°F 1.09 in
April 74.2°F 51.8°F 0.99 in 82.5°F 56.6°F 0.35 in
May 76.7°F 56.4°F 0.35 in 91.5°F 64.7°F 0.19 in
June 81.9°F 60.2°F 0.09 in 101.5°F 72.7°F 0.03 in
July 87.2°F 64.4°F 0.12 in 104.0°F 80.8°F 0.81 in
August 89.0°F 65.3°F 0.06 in 102.5°F 80.5°F 0.96 in
September 86.9°F 63.1°F 0.16 in 97.5°F 74.7°F 0.71 in
October 80.8°F 57.3°F 0.57 in 86.3°F 62.7°F 0.67 in
November 74.6°F 49.1°F 1.08 in 74.0°F 50.8°F 0.90 in
December 68.0°F 43.8°F 2.14 in 63.9°F 42.7°F 0.81 in
San Marcos overview
Full climate profile
 Phoenix overview
Full climate profile