Williamson, Arizona Weather
The monsoon settles in. Day 15 of summer. Read this microseason across nine climate regions →
Williamson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——93°69°—
- MondayJul 6Overcast——93°72°0°
- TuesdayJul 7Overcast——96°70°+3°
- WednesdayJul 8Clear——96°70°0°
- ThursdayJul 9Clear——95°69°-1°
- FridayJul 10Clear——95°67°0°
- SaturdayJul 11Clear——97°69°+2°
AQI 70 (Moderate), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 50.3 µg/m³ (AQI 137) with a 0.86 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 8.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 37
- UV peak
- 8.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 50.3 µg/m³ (AQI 137) with a 0.86 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.86
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:47 PM
- Moonset
- 10:48 AM
- In sign
- ♓︎ Pisces
The monsoon settles in
Williamson at a glance
- Today vs. normal: 79°F — typical for the season
- Last frost: March 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Williamson
- Sun93°68°6%
- Mon93°72°3%
- Tue96°70°2%
- Wed96°70°1%
- Thu95°69°1%
- Fri95°67°3%
- Sat97°69°4%
- Sun99°69°16%
- Mon98°69°22%
- Tue93°67°31%
- Wed93°66°36%
- Thu95°69°32%
- Fri102°69°42%
- Sat104°74°42%
- Sun104°70°27%
- Mon103°71°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
ZIP codes in Williamson
- 86305