Peru, IL Weather

LaSalle County9:55 PM CDT41.33°N, 89.13°WElevation 600 ft

Current conditions

Clear
59°
Clear
Feels like 59°
High 75° Thursday·Low 50° tonight
WindCalm
Humidity63%
Dew point46°
Cloud cover3%
UV index0 Low
Sunrise7:16 AM
Sunset6:08 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Tonight

    Mostly clear, with a low around 50. Wind around 0 mph.

  • Thursday

    Sunny. High near 75, with temperatures falling to around 72 in the afternoon. East northeast wind 0 to 5 mph.

  • Thursday Night

    Mostly clear, with a low around 47. East wind 0 to 5 mph.

National Weather Service forecast updated 12 hrs ago.

Hourly

Hourly forecast
  1. Now Clear 59°
  2. 10 PM Mostly Clear 57°
  3. 11 PM Mostly Clear 56°
  4. Thu12 AM Mostly Clear 55°
  5. 1 AM Mostly Clear 54°
  6. 2 AM Clear 53°
  7. 3 AM Clear 52°
  8. 4 AM Clear 52°
  9. 5 AM Clear 51°
  10. 6 AM Sunny 50°
  11. 7 AM Sunny 50°
  12. 8 AM Sunny 52°
  13. 9 AM Sunny 57°
  14. 10 AM Sunny 62°
  15. 11 AM Sunny 66°
  16. 12 PM Sunny 70°
  17. 1 PM Sunny 72°
  18. 2 PM Sunny 74°
  19. 3 PM Sunny 74°
  20. 4 PM Sunny 74°
  21. 5 PM Sunny 72°
  22. 6 PM Mostly Clear 69°
  23. 7 PM Mostly Clear 64°
  24. 8 PM Mostly Clear 61°

10-day forecast

Details
  1. TodayOct 21 Sunny Sunny50°74°
  2. ThuOct 22 Sunny Sunny47°75°
  3. FriOct 23 Sunny Sunny49°73°
  4. SatOct 24 Mostly Sunny Mostly Sunny51°73°
  5. SunOct 25 Partly Sunny Partly Sunny51°75°
  6. MonOct 26 Partly Sunny Partly Sunny17%47°69°
  7. TueOct 27 Slight Chance Rain Showers Slight Chance Rain Showers17%41°60°
  8. WedOct 28 Sunny Sunny40°53°
  9. ThuOct 29 Partly cloudy Partly cloudy39°60°
  10. FriOct 30 Partly cloudy Partly cloudy43°59°

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 near Peru

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Air quality

53
Moderate
Fine particles (PM2.5)

Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Forecast

  • WedModerate
  • ThuModerate
  • FriModerate

Peoria, 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 7:16 AM
Sunset 6:08 PM
Daylight 10 h 52 min (−2 min 37 s tomorrow)
Waxing Gibbous · 82% lit
Moonrise 3:50 PM Moonset 2:14 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low62° / 41°
Record high87° (1979)
Record low21° (1925)
Wettest1.04 in (1933)
Yesterday69° / 38°
Month to date3.07 in (normal 1.93 in)

Ottawa 4sw, records since 1890. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 3 hrs ago

Key Messages

- The dry and unseasonably mild weather will continue through the upcoming weekend.

Discussion

Issued at 136 PM CDT Wed Oct 21 2026

An anomalously strong mid-level ridge over the central CONUS will anchor omega blocking across much of North America over the next several days. Meanwhile, an elongated surface ridge extending from the Lower Mississippi River Valley to the Canadian Maritimes is in the processes of congealing with another expansive high pressure shifting toward the Upper Great Lakes. As a result, quiet weather with unseasonably warm conditions will continue through the upcoming weekend. As was observed the past few mornings, generally clear skies and light/calm winds should promote shallow fog across primarily interior northern Illinois late tonight through sunrise Thursday.

The blocking pattern will slowly break down early next week as the ridge flattens and a southwestern upper-level low begins to meander toward the central CONUS. A series of smaller troughs on the periphery of a developing longwave trough across the north Pacific and western Canada will eventually pick up the southwestern low. Consensus guidance suggests that the influence of the low on our area could occur as early as Monday night, but more likely Tuesday and Wednesday. Cooler and more seasonable conditions would accompany this system.

Kluber

Aviation

Issued at 641 PM CDT Wed Oct 21 2026

Main aviation forecast concern is the potential for patchy IFR/LIFR fog to develop mainly northwest of Chicago early Thursday morning.

Surface high pressure ridge has shifted east of the area across lower MI/IN early this evening. Light south-southwest surface winds at the terminals are expected to quickly become light/variable or just calm early this evening, though there may be a brief (1-hour)period of light east winds at ORD/MDW/GYY as a weak lake breeze decays. The pressure gradient will remain weak into Thursday, keeping winds light/variable through the morning before becoming light (5-6 kts) northeast and eventually east in the afternoon/evening.

Clear skies and light/calm winds tonight will allow for ideal radiative cooling conditions, allowing shallow fog to develop in spots once again. This appears most likely across southern WI/northeast IA and far northern/northwest IL KRFD) where surface dew points remained in the mid-upper 40s during peak mixing Wednesday afternoon. While guidance is not too aggressive with lower visibilities, have maintained a 2SM IFR tempo and MIFG in the KRFD TAF, and will monitor overnight for tactical lower vsbys. The drier low-level airmass to the southeast looks to be less conducive to fog development with southeastward extent. Have maintained a 3SM MIFG tempo at DPA, with VFR conditions for the other Chicago area terminals.

Ratzer

Lot Watches

IL...None. IN...None. LM...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 4Search index and reflects what the press published. Terms of use.