Williamson, Arizona Weather
The dry breath stills. Day 88 of spring. Read this microseason across nine climate regions →
Williamson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Heavy Showers34%0.39″88°63°—
- TuesdayJun 16Overcast——93°65°+5°
- WednesdayJun 17Clear——91°66°-2°
- ThursdayJun 18Overcast——91°71°0°
- FridayJun 19Clear——89°65°-2°
- SaturdayJun 20Clear——86°62°-3°
- SundayJun 21Clear——86°55°0°
AQI 35 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 7.7 µg/m³, PM10 at 16.7 µg/m³ — typical background levels with no transport signature.
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 7.7 µg/m³, PM10 at 16.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.46
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:28 AM
- Moonset
- 8:01 PM
- In sign
- ♊︎ Gemini
The dry breath stills
Williamson at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: March 15 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Williamson
- Mon89°64°34%
- Tue93°65°1%
- Wed91°66°2%
- Thu91°71°2%
- Fri89°65°0%
- Sat86°62°0%
- Sun86°55°1%
- Mon92°56°0%
- Tue94°60°1%
- Wed93°64°1%
- Thu88°66°3%
- Fri88°64°6%
- Sat82°64°6%
- Sun80°63°19%
- Mon90°63°19%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Williamson
SPC has placed Williamson in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- 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. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Williamson
- 86305