Mechanicsburg, Illinois Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
Mechanicsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Clear——75°54°—
- TuesdayJun 16Overcast44%—79°56°+4°
- WednesdayJun 17T-storm w/ Hvy Hail90%—87°57°+8°
- ThursdayJun 18Light Drizzle90%—74°58°-13°
- FridayJun 19Partly Cloudy——73°55°-1°
- SaturdayJun 20Overcast——76°57°+3°
- SundayJun 21Light Drizzle45%0.05″73°64°-3°
AQI 28 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 6.8 µg/m³ (AQI 38) with a 0.94 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
PM × Wind × Precip
PM2.5 at 6.8 µg/m³ (AQI 38) with a 0.94 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:32 AM
- Moonset
- 8:43 PM
- In sign
- ♋︎ Cancer
Sun climbs to its northern throne
Mechanicsburg at a glance
- Today vs. normal: 16°F below the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Mechanicsburg
- Mon76°54°0%
- Tue79°56°44%
- Wed87°57°90%
- Thu74°58°90%
- Fri73°55°1%
- Sat76°57°9%
- Sun73°64°45%
- Mon74°59°45%
- Tue72°55°17%
- Wed77°55°13%
- Thu82°62°11%
- Fri87°70°27%
- Sat91°73°52%
- Sun90°73°23%
- Mon81°68°35%
- Tue84°65°39%
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 — Mechanicsburg
SPC has placed Mechanicsburg in the Enhanced Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3ENHEnhanced Risk
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
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