Phoenix Climate & Weather Averages
United States · Hot Desert climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
Best Time to Visit Phoenix
Based on temperature comfort, low rainfall, and sunshine hours, the best months to visit Phoenix are:
April, May, October
Scores based on ideal temperature (18-28°C), low precipitation, and high sunshine. April scores 95/100.
Phoenix has a Hot Desert climate with very hot summers and mild winters. The warmest month is July with an average temperature of 36.0°C (96.8°F), while January is the coldest at 11.4°C (52.5°F). Annual precipitation averages 294.0mm spread across approximately 47.0 rainy days per year, with July being the wettest month at 71.5mm and May the driest at 0.2mm. The city receives an average of 8.3-13.0 hours of sunshine per day, with the sunniest months being June and May. Humidity remains relatively consistent throughout the year, averaging around 33.3% annually, while average wind speeds reach 18.3 km/h. The overall annual mean temperature is 23.8°C (74.8°F), reflecting the hot desert conditions shaped by Phoenix's latitude (33.45°) and surrounding geography. For travelers, the best time to visit is April, May, October, when temperatures are comfortable and rainfall is lower.
Phoenix's hot desert climate is one of the most extreme in the United States. I've studied the summer data and found that temperatures regularly exceed 40°C from June to August. The best time for visiting is November to March, when daytime temperatures are pleasant and the city's outdoor attractions are accessible. The winter months are mild and sunny, making Phoenix a popular winter destination.
Seasonal Climate Overview
Spring (Mar-May)
Average temperature 22.8°C (73.0°F), rainfall 15.8mm, sunshine 11.9 hrs/day, humidity 26.6%. Warm season conditions prevail. Expect around 2.8 rainy days per month.
Summer (Jun-Aug)
Average temperature 34.7°C (94.5°F), rainfall 39.6mm, sunshine 12.4 hrs/day, humidity 27.6%. Warm season conditions prevail. Expect around 5.1 rainy days per month.
Autumn (Sep-Nov)
Average temperature 24.9°C (76.8°F), rainfall 11.4mm, sunshine 10.5 hrs/day, humidity 30.1%. Warm season conditions prevail. Expect around 2.9 rainy days per month.
Winter (Dec-Feb)
Average temperature 12.6°C (54.7°F), rainfall 31.2mm, sunshine 8.9 hrs/day, humidity 48.8%. Mild transitional weather characterizes this period. Expect around 5.0 rainy days per month.
Monthly Temperature Averages (°C / °F)
| Month | Avg High | Avg Low | Mean Temp |
|---|---|---|---|
| January | 18.2°C (64.8°F) | 5.3°C (41.5°F) | 11.4°C (52.5°F) |
| February | 20.5°C (68.9°F) | 6.7°C (44.1°F) | 13.4°C (56.1°F) |
| March | 23.2°C (73.8°F) | 9.5°C (49.1°F) | 16.5°C (61.7°F) |
| April | 30.5°C (86.9°F) | 14.8°C (58.6°F) | 23.4°C (74.1°F) |
| May | 35.4°C (95.7°F) | 20.3°C (68.5°F) | 28.6°C (83.5°F) |
| June | 40.4°C (104.7°F) | 25.8°C (78.4°F) | 33.7°C (92.7°F) |
| July | 41.7°C (107.1°F) | 29.6°C (85.3°F) | 36.0°C (96.8°F) |
| August | 40.2°C (104.4°F) | 28.3°C (82.9°F) | 34.4°C (93.9°F) |
| September | 38.3°C (100.9°F) | 24.9°C (76.8°F) | 31.8°C (89.2°F) |
| October | 32.4°C (90.3°F) | 17.6°C (63.7°F) | 25.3°C (77.5°F) |
| November | 24.7°C (76.5°F) | 10.4°C (50.7°F) | 17.6°C (63.7°F) |
| December | 19.6°C (67.3°F) | 6.8°C (44.2°F) | 13.0°C (55.4°F) |
Monthly Precipitation (mm)
| Month | Avg Rainfall | Bar |
|---|---|---|
| January | 31.0 mm | |
| February | 27.3 mm | |
| March | 45.5 mm | |
| April | 1.6 mm | |
| May | 0.2 mm | |
| June | 2.2 mm | |
| July | 71.5 mm | |
| August | 45.2 mm | |
| September | 18.3 mm | |
| October | 9.7 mm | |
| November | 6.1 mm | |
| December | 35.2 mm |
Monthly Rainy Days (avg days with rain > 0.1mm)
| Month | Avg Rainy Days | Bar |
|---|---|---|
| January | 6.2 | |
| February | 3.8 | |
| March | 7.4 | |
| April | 0.8 | |
| May | 0.2 | |
| June | 1.4 | |
| July | 6.6 | |
| August | 7.4 | |
| September | 3.6 | |
| October | 2.2 | |
| November | 2.8 | |
| December | 5.0 |
Monthly Humidity (%)
| Month | Avg Humidity | Bar |
|---|---|---|
| January | 54.5% | |
| February | 44.5% | |
| March | 42.8% | |
| April | 21.4% | |
| May | 15.7% | |
| June | 16.6% | |
| July | 29.9% | |
| August | 36.2% | |
| September | 30.4% | |
| October | 27.5% | |
| November | 32.4% | |
| December | 47.5% |
Monthly Wind Speed (avg max km/h)
| Month | Avg Max Wind | Bar |
|---|---|---|
| January | 15.1 km/h | |
| February | 17.9 km/h | |
| March | 19.3 km/h | |
| April | 20.3 km/h | |
| May | 21.4 km/h | |
| June | 21.6 km/h | |
| July | 21.8 km/h | |
| August | 20.0 km/h | |
| September | 19.0 km/h | |
| October | 16.5 km/h | |
| November | 14.7 km/h | |
| December | 12.5 km/h |
Monthly UV Index (avg max)
| Month | UV Index | Risk Level | Bar |
|---|---|---|---|
| January | — | — | |
| February | — | — | |
| March | — | — | |
| April | — | — | |
| May | — | — | |
| June | — | — | |
| July | — | — | |
| August | — | — | |
| September | — | — | |
| October | — | — | |
| November | — | — | |
| December | — | — |
Monthly Snowfall (cm)
| Month | Avg Snowfall | Bar |
|---|---|---|
| January | 0.0 cm | |
| February | 0.1 cm | |
| March | 0.0 cm | |
| April | 0.0 cm | |
| May | 0.0 cm | |
| June | 0.0 cm | |
| July | 0.0 cm | |
| August | 0.0 cm | |
| September | 0.0 cm | |
| October | 0.0 cm | |
| November | 0.0 cm | |
| December | 0.0 cm |
Monthly Sunshine Hours (daily average)
| Month | Avg Daily Sunshine | Bar |
|---|---|---|
| January | 8.5 hrs | |
| February | 9.8 hrs | |
| March | 10.3 hrs | |
| April | 12.5 hrs | |
| May | 12.9 hrs | |
| June | 13.0 hrs | |
| July | 12.1 hrs | |
| August | 12.0 hrs | |
| September | 11.4 hrs | |
| October | 10.6 hrs | |
| November | 9.4 hrs | |
| December | 8.3 hrs |
Frequently Asked Questions
What is the hottest month in Phoenix?
July is the hottest month with an average temperature of 36.0°C (96.8°F).
What is the coldest month in Phoenix?
January is the coldest month with an average temperature of 11.4°C (52.5°F).
What is the rainiest month in Phoenix?
July is the wettest month with an average of 71.5mm of precipitation. The city experiences about 47.0 rainy days per year.
When is the best time to visit Phoenix?
The best time to visit Phoenix is during April, May, October, when temperatures are comfortable and rainfall is lower.
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Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 33.45°, -112.07°. Timezone: America/Phoenix. Last updated: 2026-07-30.