Mechanicsburg, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mechanicsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle39%0.01″90°72°—
- SundayJul 5Overcast21%—84°71°-6°
- MondayJul 6Light Drizzle13%—83°68°-1°
- TuesdayJul 7Mostly Clear——81°62°-2°
- WednesdayJul 8Light Drizzle——84°64°+3°
- ThursdayJul 9Thunderstorm40%0.01″84°71°0°
- FridayJul 10Drizzle40%0.07″82°70°-2°
AQI 26 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 7.6 µg/m³, PM10 at 8.5 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 during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 5.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 19 around 1 PM.
- Present
- AQI 37
- UV peak
- 5.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5 at 7.6 µg/m³, PM10 at 8.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- light
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:52 PM
- Moonset
- 10:04 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Mechanicsburg at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62545
16-Day Forecast — Mechanicsburg
- Sat90°72°39%
- Sun84°71°21%
- Mon83°68°13%
- Tue81°62°4%
- Wed84°64°6%
- Thu84°71°40%
- Fri82°70°40%
- Sat83°68°22%
- Sun73°59°6%
- Mon72°57°6%
- Tue77°60°11%
- Wed79°63°14%
- Thu82°65°19%
- Fri83°69°19%
- Sat86°71°19%
- Sun85°72°35%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 — Mechanicsburg
SPC has placed Mechanicsburg in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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 Mechanicsburg
- 62545