San Luis Obispo, CA vs Phoenix, AZ

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

San Luis Obispo is cooler than Phoenix (59.7°F vs 72.5°F annual avg) and wetter than it (17.9 in vs 8.9 in per year). San Luis Obispo has a Warm-summer Mediterranean climate; Phoenix a Desert (hot) climate.

San Luis Obispo, CA

Annual avg
59.7°F
Annual precip
17.9 in
Warmest month
September (79.5°F)
Coldest month
December (40.2°F)
Annual swing
14.5°F
Pleasant months
4 / 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

San Luis Obispo

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 Luis Obispo Phoenix
High Low Precip High Low Precip
January 65.0°F 40.6°F 3.86 in 65.4°F 44.1°F 1.17 in
February 65.1°F 42.4°F 3.54 in 68.1°F 46.1°F 1.21 in
March 66.7°F 44.5°F 3.17 in 75.0°F 50.9°F 1.09 in
April 69.1°F 45.6°F 1.05 in 82.5°F 56.6°F 0.35 in
May 72.0°F 47.8°F 0.47 in 91.5°F 64.7°F 0.19 in
June 75.2°F 51.1°F 0.10 in 101.5°F 72.7°F 0.03 in
July 78.0°F 54.3°F 0.08 in 104.0°F 80.8°F 0.81 in
August 79.3°F 54.9°F 0.01 in 102.5°F 80.5°F 0.96 in
September 79.5°F 53.4°F 0.04 in 97.5°F 74.7°F 0.71 in
October 77.2°F 49.7°F 0.92 in 86.3°F 62.7°F 0.67 in
November 71.1°F 44.7°F 1.43 in 74.0°F 50.8°F 0.90 in
December 64.9°F 40.2°F 3.27 in 63.9°F 42.7°F 0.81 in
San Luis Obispo overview
Full climate profile
 Phoenix overview
Full climate profile