| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 19.8° | 7.6° | 17.8mm | 3.6 | 92 |
| February | 21.7° | 9.2° | 20.7mm | 3.7 | 93 |
| March | 25.7° | 12.3° | 17.5mm | 2.8 | 94 |
| April | 29.9° | 15.9° | 5.5mm | 1.5 | 85 |
| May | 35° | 20.9° | 1.9mm | 0.7 | 67 |
| June | 40.5° | 26.1° | 1mm | 0.5 | 45 |
| July | 41.7° | 29.4° | 22.2mm | 4 | 33 |
| August | 40.8° | 28.8° | 24.4mm | 4.6 | 36 |
| September | 38.3° | 25.7° | 13.7mm | 2.6 | 50 |
| October | 32° | 18.7° | 12.6mm | 2.1 | 76 |
| November | 25.2° | 12.2° | 10.8mm | 1.9 | 96 |
| December | 19.5° | 7.5° | 15.9mm | 3.8 | 91 |
January in Phoenix averages a daily high of 19.8°C with nights around 7.6°C. Expect roughly 3.6 wet days totalling 17.8mm. Comfortable conditions for being outdoors all day.
February in Phoenix averages a daily high of 21.7°C with nights around 9.2°C. Expect roughly 3.7 wet days totalling 20.7mm. Comfortable conditions for being outdoors all day.
March in Phoenix averages a daily high of 25.7°C with nights around 12.3°C. Rain is rare — about 2.8 wet days and 17.5mm across the month. Comfortable conditions for being outdoors all day.
April in Phoenix averages a daily high of 29.9°C with nights around 15.9°C. Rain is rare — about 1.5 wet days and 5.5mm across the month. Comfortable conditions for being outdoors all day.
May in Phoenix averages a daily high of 35°C with nights around 20.9°C. Rain is rare — about 0.7 wet days and 1.9mm across the month. Generally workable, with some weather to plan around.
June in Phoenix averages a daily high of 40.5°C with nights around 26.1°C. Rain is rare — about 0.5 wet days and 1mm across the month. Demanding conditions — pack for it and plan indoor options.
July in Phoenix averages a daily high of 41.7°C with nights around 29.4°C. Expect roughly 4 wet days totalling 22.2mm. A hard month to visit for comfort alone.
August in Phoenix averages a daily high of 40.8°C with nights around 28.8°C. Expect roughly 4.6 wet days totalling 24.4mm. Demanding conditions — pack for it and plan indoor options.
September in Phoenix averages a daily high of 38.3°C with nights around 25.7°C. Rain is rare — about 2.6 wet days and 13.7mm across the month. Demanding conditions — pack for it and plan indoor options.
October in Phoenix averages a daily high of 32°C with nights around 18.7°C. Rain is rare — about 2.1 wet days and 12.6mm across the month. Comfortable conditions for being outdoors all day.
November in Phoenix averages a daily high of 25.2°C with nights around 12.2°C. Rain is rare — about 1.9 wet days and 10.8mm across the month. Comfortable conditions for being outdoors all day.
December in Phoenix averages a daily high of 19.5°C with nights around 7.5°C. Expect roughly 3.8 wet days totalling 15.9mm. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Phoenix peaks at 96.
Based on 30 years of records, November–March scores highest for comfort in Phoenix, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 41.7°C.
August is the wettest, averaging 24.4mm of rain across roughly 4.6 wet days.
December is the coolest month, with average daily highs around 19.5°C.