Mattoon, IL 61938 Weather

Coles County2:28 AM CDT39.48°N, 88.38°W

Current conditions

Clear
46°
Clear
Feels like 46°
High 73°·Low 43° tonight
WindCalm
Humidity87%
Dew point43°
Pressure30.27 inHg
Visibility10 mi
Cloud cover1%
UV index0 Low
Sunrise7:10 AM
Sunset6:07 PM

Observed at Mattoon / Charleston, Coles County Memorial Airport · 33 min ago

Forecast

10-day

  • Overnight

    Clear, with a low around 43. Wind around 0 mph.

  • Wednesday

    Sunny, with a high near 73. North northwest wind around 2 mph.

  • Wednesday Night

    Clear, with a low around 45. North northeast wind around 1 mph.

National Weather Service forecast updated 1 hr ago.

Hourly

Hourly forecast
  1. Now Clear 46°
  2. 3 AM Clear 45°
  3. 4 AM Clear 45°
  4. 5 AM Clear 44°
  5. 6 AM Sunny 43°
  6. 7 AM Sunny 43°
  7. 8 AM Sunny 45°
  8. 9 AM Sunny 52°
  9. 10 AM Sunny 60°
  10. 11 AM Sunny 64°
  11. 12 PM Sunny 68°
  12. 1 PM Sunny 71°
  13. 2 PM Sunny 72°
  14. 3 PM Sunny 73°
  15. 4 PM Sunny 73°
  16. 5 PM Sunny 71°
  17. 6 PM Mostly Clear 69°
  18. 7 PM Mostly Clear 64°
  19. 8 PM Mostly Clear 58°
  20. 9 PM Mostly Clear 55°
  21. 10 PM Clear 54°
  22. 11 PM Clear 52°
  23. Thu12 AM Clear 51°
  24. 1 AM Mostly Clear 50°

10-day forecast

Details
  1. TonightOct 20 Clear Clear43°
  2. TodayOct 21 Sunny Sunny45°73°
  3. ThuOct 22 Sunny Sunny45°75°
  4. FriOct 23 Sunny Sunny45°73°
  5. SatOct 24 Mostly Sunny Mostly Sunny48°74°
  6. SunOct 25 Mostly Sunny Mostly Sunny50°77°
  7. MonOct 26 Partly Sunny Partly Sunny47°73°
  8. TueOct 27 Mostly Sunny Mostly Sunny66°
  9. WedOct 28 Cloudy Cloudy39°56°
  10. ThuOct 29 Sunny Sunny34°56°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in Illinois

More weather news

Air quality

38
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • WedModerate
  • ThuModerate
  • FriModerate

Decatur, IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:10 AM
Sunset 6:07 PM
Daylight 10 h 57 min (−2 min 26 s tomorrow)
Waxing Gibbous · 75% lit
Moonrise 3:45 PM Moonset 2:14 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low67° / 44°
Record high88° (1953)
Record low21° (1952)
Wettest2.67 in (2020)
Yesterday76° / 39°
Month to date0.73 in (normal 2.51 in)

Charleston, records since 1896. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in ILX, issued 1 hr ago

Key Messages

- Dry conditions and tranquil weather prevail across central and southeast Illinois through this weekend.

- Above normal temperatures will dominate the region, with afternoon highs climbing into the mid to upper 70s.

Discussion

Issued at 1233 PM CDT Tue Oct 20 2026

Expansive surface high pressure centered south of James Bay extends southwest into the mid and lower Mississippi Valley this afternoon. Broad subsidence and very dry air below 500 mb will lead to clear skies through tonight. High temperatures to peak in the lower 70s today, followed by overnight lows in the mid 40s.

A moderating trend begins Wednesday and continues through this weekend as upper level ridging amplifies overhead. Suite of model guidance indicates 850 hPa temperatures warming to +11C to +13C through this period. Afternoon mix-down of this air will lead to daily highs in the mid 70s through Friday, then upper 70s to around 80F this weekend when southwest low level flow becomes better established. Forecast soundings show daytime boundary layer mixing reducing afternoon dewpoints into the 40s, yielding minimum relative humidity values between 30 and 40 percent. Normally in late October this would result in an enhanced risk of fire spread, but a weak MSLP gradient will promote light winds under 10 mph through Friday.

A transition in the upper air pattern begins Monday into Tuesday as a potent upper-level trough traverses the northern Plains and lifts toward the Upper Midwest. The ECMWF-AI and operational ECMWF-Ens have remained consistent with a slightly slower frontal passage than the GEFS members, bringing the attendant cold front into western Illinois Monday evening and clearing southeast Illinois Tuesday afternoon. The NBM introduces slight chance PoPs (15 percent) west of the Illinois River Monday afternoon. With a lack of upper level support and projected dry airmass, models generally show a dry frontal passage for the remainder of the CWA.

Aviation

Issued at 1239 AM CDT Wed Oct 21 2026

VFR conditions will prevail at all TAF sites next 24hrs with clear skies. Winds will remain light and variable.

Ilx Watches

None.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.