Phoenix, Arizona Weather
Thunder finally silent. Day 93 of summer. Read this microseason across nine climate regions →
Phoenix weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 6:32 AM MST · Open-Meteo
- TodaySep 21Overcast——100°76°—
- TuesdaySep 22Clear——97°72°-3°
- WednesdaySep 23Light Drizzle——94°82°-3°
- ThursdaySep 24Drizzle17%—98°84°+4°
- FridaySep 25Drizzle——97°82°-1°
- SaturdaySep 26Partly Cloudy——100°88°+3°
- SundaySep 27Light Drizzle17%0.01″95°84°-5°
Air quality now AQI 52 · Moderate
AQI 52 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 12.8 µg/m³ (AQI 58), ratio 0.46 with 6 mph wind — characteristic of long-range haze transport rather than a local source.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 12.8 µg/m³ (AQI 58), ratio 0.46 with 6 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.46
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 3:46 PM
- Moonset
- 1:12 AM
- In sign
- ♑︎ Capricorn
Thunder finally silent
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Phoenix at a glance
- Today vs. normal: Today averages 88°F (high 100°F, low 76°F), 5°F above the 83°F normal for Sep 21
- Last frost: January 8 (1991–2020 median, NOAA station 13 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant tomatoes, peppers, beans, squash; harvest summer squash, winter squash
16-Day Forecast — Phoenix
- Mon100°77°2%
- Tue97°72°5%
- Wed94°82°7%
- Thu98°84°17%
- Fri97°82°8%
- Sat100°88°4%
- Sun95°84°17%
- Mon96°84°21%
- Tue99°88°10%
- Wed101°89°10%
- Thu104°90°11%
- Fri102°91°14%
- Sat99°88°11%
- Sun98°85°10%
- Mon96°77°16%
- Tue90°80°3%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Phoenix
Interactive wind and temperature map centered on Phoenix — it loads in your browser. Open the full weather map.
Right now in the garden
Peak growing season
As of September 21, the growing season is at its peak — the first frost (around December 25) is weeks away. Fall transplants go in about 10–12 weeks before the first frost, October 2 to October 16 here. This city's planting calendar for September: plant tomatoes, peppers, beans, and squash; harvest summer squash and winter squash.
SPC Convective Outlook
Storm Prediction Center — Phoenix
SPC includes Phoenix in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Phoenix
Phoenix sits in Maricopa County, where the year’s longest day runs 14h 23m of daylight and its shortest just 9h 55m — a swing of +4h 28m between the June and December solstices.
Phoenix is the state’s largest city. The nearest town Phoenix tracks is Glendale, roughly 8 miles to the W.
Air quality in Phoenix
Air quality in Phoenix’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 72). See the full air-quality history for Phoenix.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | lettuce, spinach, radishes, fall brassicas, carrots |
| February | — | lettuce, peas, spinach, radishes |
| March | tomatoes, peppers, beans, squash | lettuce, peas, spinach |
| April | tomatoes, squash | peas |
| May | squash | beans, summer squash, garlic |
| June | squash | tomatoes, peppers, summer squash, winter squash |
| July | squash | summer squash, winter squash |
| August | tomatoes, peppers, beans, squash | summer squash, winter squash |
| September | tomatoes, peppers, beans, squash | summer squash, winter squash |
| October | beans, squash, fall brassicas, carrots | beans, summer squash, winter squash |
| November | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes, garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
A year in weather
In Phoenix, July runs warmest near 92°F and December coldest around 49°F, while August is the wettest month (1.7 inches) and June the driest (0.0 inches).
| Month | Mean temp | Precip |
|---|---|---|
| January | 50° | 0.9″ |
| February | 54° | 1.1″ |
| March | 60° | 1.1″ |
| April | 70° | 0.3″ |
| May | 80° | 0.0″ |
| June | 89° | 0.0″ |
| July | 92° | 0.8″ |
| August | 89° | 1.7″ |
| September | 85° | 0.8″ |
| October | 73° | 0.4″ |
| November | 59° | 0.8″ |
| December | 49° | 1.4″ |
Regional context
Similar climates Paradise Valley, AZ, Glendale, AZ, Sun City, AZ
Phoenix's climate, from modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo), pairs 50°F Januarys with 92°F Julys — a 42°F swing. About 9.3 inches of precipitation falls each year.
August is Phoenix's wettest month, at 1.7 inches, and June its driest, at 0.0 inches — yet November through March brings Phoenix more rain in total than May through September. For a nearby comparison to Phoenix, look at places like Paradise Valley, AZ, Glendale, AZ and Sun City, AZ.
By January 8 the frosts ease in Phoenix, opening the season for lettuce, chard, arugula, and mustard greens. In Phoenix, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Phoenix's frost date. Around December 25, freezing nights resume in Phoenix and tender crops must come in. Sheltered Phoenix yards can escape a light frost.
Similar climates: Paradise Valley, AZ, Glendale, AZ, Sun City, AZ, Youngtown, AZ, Tolleson, AZ.
Frequently asked
- When does it freeze in Phoenix?
- In Phoenix, expect the last spring frost near January 8; Phoenix's first autumn frost comes around December 25.
- What is the rainy season in Phoenix?
- August is the wettest month in Phoenix, about 1.7 inches on average; the year totals roughly 9 inches.
- What is the warmest month in Phoenix?
- July is Phoenix's warmest month, averaging about 92°F.
- What is the coldest month in Phoenix?
- Phoenix bottoms out in December, with a mean near 49°F.
- When can I start a vegetable garden in Phoenix?
- Phoenix's last frost (January 8) cues hardy greens; in Phoenix, hold heat-lovers two weeks past.
- What hardiness zone is Phoenix?
- Phoenix sits in the USDA zone set by December lows near 49°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Phoenix?
- Phoenix's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Phoenix?
- See this week's day-by-day rain chances for Phoenix in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Phoenix?
- Current conditions for Phoenix and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Phoenix forecast updated?
- The Phoenix forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Phoenix?
- Today's sunrise and sunset times for Phoenix are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Phoenix?
- The next few days in Phoenix's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Phoenix sits at 33.6°N; its climate zone is hot desert (Köppen approximation).
ZIP codes in Phoenix
- 85001
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