South Lyon, Michigan Weather
Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →
South Lyon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Light Rain68%0.19″74°65°—
- MondayAug 3Clear——80°59°+6°
- TuesdayAug 4Clear——86°58°+6°
- WednesdayAug 5Overcast——91°58°+5°
- ThursdayAug 6Drizzle55%—84°66°-7°
- FridayAug 7Overcast39%—92°65°+8°
- SaturdayAug 8Thunderstorm18%—92°65°0°
AQI 65 (Moderate), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM scrubbed by 2 hours of recent rain — PM2.5 down to 14.6 µg/m³, PM10 to 14.6 µg/m³.
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 34. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 34
- UV peak
- 1.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 14.6 µg/m³, PM10 to 14.6 µg/m³.
- PM2.5/PM10
- 1.00
- Wind
- breezy
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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).
Red sky at night, sailor's delight.
- Moonrise
- 10:18 PM
- Moonset
- 10:39 AM
- In sign
- ♓︎ Pisces
Night falls a minute earlier
South Lyon at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: May 1 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP code: 48178
16-Day Forecast — South Lyon
- Sun74°65°68%
- Mon80°59°0%
- Tue86°58°0%
- Wed91°58°5%
- Thu84°66°55%
- Fri92°65°39%
- Sat92°65°18%
- Sun100°69°32%
- Mon87°72°32%
- Tue86°66°18%
- Wed74°65°21%
- Thu94°68°34%
- Fri96°73°42%
- Sat92°73°24%
- Sun82°61°19%
- Mon76°64°16%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near South Lyon
Right now in the garden
Peak growing season
As of August 2, 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 — South Lyon
SPC includes South Lyon in the general thunderstorm area today — no severe risk, but storms are possible.
- 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.
Sun & seasons in South Lyon
South Lyon sits in Oakland County, where the year’s longest day runs 15h 18m of daylight and its shortest just 9h 4m — a swing of +6h 14m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Detroit, the state’s largest city, lies about 29 miles to the E. The nearest town South Lyon tracks is Ann Arbor, roughly 13 miles to the SSW.
Air quality in South Lyon’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 37). See the full air-quality history for South Lyon.
ZIP codes in South Lyon
- 48178