Climate of Phoenix, United States

BWh

Köppen-Geiger climate classification: BWh — Arid, desert, hot.

Phoenix has a mean annual temperature of 23.8 °C and receives 190 mm of precipitation per year (1991–2020 climate normals). The warmest month is July with a mean temperature of 35.1 °C, while December is the coldest month at 12.6 °C. Most precipitation falls in August (28 mm); the driest month is June (2 mm).

Climate Diagram

Climate diagram for Phoenix: monthly mean temperature (red line, left axis, °C) and monthly precipitation (blue bars, right axis, mm), 1991–2020 0 0 10 20 20 40 30 60 40 80 °C mm J F M A M J J A S O N D

Walter–Lieth diagram: blue bars show monthly precipitation (right axis, mm), the red line shows monthly mean temperature (left axis, °C). Scale: 1 °C ≡ 2 mm.

Climate Table

MonthMean temperature (°C)Precipitation (mm)
January13.219.9
February15.121.4
March18.521.2
April22.66.1
May27.83.3
June32.92.3
July35.121.1
August34.128.0
September31.115.6
October24.615.6
November17.614.2
December12.621.0
Year23.8189.7

Live Forecast

Looking for the current weather instead of climate averages? Open the live forecast diagrams in WZ Diagrams — 15 weather models, ensemble spread, radar and more.

Data Source

Climate normals and Köppen-Geiger classification: Beck et al. (2023), Scientific Data 10, 724, CC BY 4.0. Period 1991–2020. Classification resolution ≈ 1 km; monthly climate data resolution ≈ 1 km (0.01°, Original 2023 release; predates the January 2026 correction), sampled at the grid cell containing the city coordinates (33.45°, -112.07°). Climate normals describe the long-term average, not current weather.