Hot-summer humid continental climate
Climate Peru - Illinois
Annual high60ºF
Annual low39ºF
Precipitation37.67 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 29 | 12 | 1.46 |
| Feb | 35 | 17 | 1.42 |
| Mar | 47 | 28 | 2.68 |
| Apr | 61 | 38 | 3.58 |
| May | 73 | 49 | 4.57 |
| Jun | 82 | 59 | 4.09 |
| Jul | 85 | 63 | 4.06 |
| Aug | 83 | 61 | 4.09 |
| Sep | 76 | 52 | 3.62 |
| Oct | 65 | 41 | 2.99 |
| Nov | 48 | 30 | 2.83 |
| Dec | 35 | 18 | 2.28 |
- JanHigh 29ºFLow 12ºFPrecip 1.46 inch
- FebHigh 35ºFLow 17ºFPrecip 1.42 inch
- MarHigh 47ºFLow 28ºFPrecip 2.68 inch
- AprHigh 61ºFLow 38ºFPrecip 3.58 inch
- MayHigh 73ºFLow 49ºFPrecip 4.57 inch
- JunHigh 82ºFLow 59ºFPrecip 4.09 inch
- JulHigh 85ºFLow 63ºFPrecip 4.06 inch
- AugHigh 83ºFLow 61ºFPrecip 4.09 inch
- SepHigh 76ºFLow 52ºFPrecip 3.62 inch
- OctHigh 65ºFLow 41ºFPrecip 2.99 inch
- NovHigh 48ºFLow 30ºFPrecip 2.83 inch
- DecHigh 35ºFLow 18ºFPrecip 2.28 inch
Climate summary
What is the average weather in Peru, Illinois?
Peru experiences a humid continental climate, marked by very strong seasonal temperature swings due to its inland location. Summers are warm, while winters are cold. The area is fairly wet overall, with precipitation spread relatively evenly throughout the year, though summer tends to be the wettest season.
Peru weather averages
Annual high60ºF
Annual low39ºF
Precipitation37.67 inch
Daily normals Peru - Illinois - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 31.2 | 15.8 | 0.07 | 0.07 | 0.30 | 0.30 |
| Jan 2 | 31.0 | 15.6 | 0.13 | 0.13 | 0.60 | 0.60 |
| Jan 3 | 30.9 | 15.4 | 0.20 | 0.20 | 0.90 | 0.90 |
| Jan 4 | 30.7 | 15.2 | 0.27 | 0.27 | 1.20 | 1.20 |
| Jan 5 | 30.6 | 15.0 | 0.33 | 0.33 | 1.50 | 1.50 |
| Jan 6 | 30.4 | 14.8 | 0.40 | 0.40 | 1.70 | 1.70 |
| Jan 7 | 30.3 | 14.7 | 0.47 | 0.47 | 2.00 | 2.00 |
| Jan 8 | 30.2 | 14.5 | 0.54 | 0.54 | 2.30 | 2.30 |
| Jan 9 | 30.1 | 14.3 | 0.60 | 0.60 | 2.60 | 2.60 |
| Jan 10 | 30.0 | 14.2 | 0.66 | 0.66 | 2.90 | 2.90 |
| Jan 11 | 29.9 | 14.0 | 0.73 | 0.73 | 3.20 | 3.20 |
| Jan 12 | 29.8 | 13.9 | 0.79 | 0.79 | 3.40 | 3.40 |
| Jan 13 | 29.7 | 13.8 | 0.85 | 0.85 | 3.70 | 3.70 |
| Jan 14 | 29.7 | 13.7 | 0.91 | 0.91 | 4.00 | 4.00 |
| Jan 15 | 29.6 | 13.6 | 0.97 | 0.97 | 4.30 | 4.30 |
| Jan 16 | 29.6 | 13.5 | 1.03 | 1.03 | 4.60 | 4.60 |
| Jan 17 | 29.5 | 13.4 | 1.09 | 1.09 | 4.90 | 4.90 |
| Jan 18 | 29.5 | 13.4 | 1.16 | 1.16 | 5.20 | 5.20 |
| Jan 19 | 29.5 | 13.3 | 1.21 | 1.21 | 5.50 | 5.50 |
| Jan 20 | 29.5 | 13.3 | 1.27 | 1.27 | 5.80 | 5.80 |
| Jan 21 | 29.5 | 13.3 | 1.32 | 1.32 | 6.00 | 6.00 |
| Jan 22 | 29.6 | 13.3 | 1.37 | 1.37 | 6.30 | 6.30 |
| Jan 23 | 29.6 | 13.3 | 1.43 | 1.43 | 6.60 | 6.60 |
| Jan 24 | 29.7 | 13.3 | 1.48 | 1.48 | 6.90 | 6.90 |
| Jan 25 | 29.7 | 13.4 | 1.53 | 1.53 | 7.10 | 7.10 |
| Jan 26 | 29.8 | 13.4 | 1.58 | 1.58 | 7.40 | 7.40 |
| Jan 27 | 29.9 | 13.5 | 1.63 | 1.63 | 7.60 | 7.60 |
| Jan 28 | 30.0 | 13.6 | 1.67 | 1.67 | 7.90 | 7.90 |
| Jan 29 | 30.1 | 13.7 | 1.72 | 1.72 | 8.10 | 8.10 |
| Jan 30 | 30.3 | 13.8 | 1.76 | 1.76 | 8.40 | 8.40 |
| Jan 31 | 30.4 | 13.9 | 1.81 | 1.81 | 8.60 | 8.60 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Peru - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 89.1 | 69.1 | – |
| Sep 2 | 91.9 | 72.0 | – |
| Sep 3 | 91.9 | 72.0 | – |
| Sep 4 | 91.9 | 72.0 | – |
| Sep 5 | 93.0 | 72.0 | – |
| Sep 6 | 87.1 | 66.0 | – |
| Sep 7 | 81.0 | 60.1 | – |
| Sep 8 | 81.0 | 59.0 | – |
| Sep 9 | 86.0 | 66.0 | – |
| Sep 10 | 77.0 | 60.1 | – |
| Sep 11 | 75.9 | 59.0 | – |
| Sep 12 | 82.0 | 57.9 | – |
| Sep 13 | 86.0 | 55.9 | – |
| Sep 14 | 72.0 | 50.0 | – |
| Sep 15 | 71.1 | 50.0 | – |
| Sep 16 | 84.0 | 64.0 | – |
| Sep 17 | 73.9 | 64.0 | – |
| Sep 18 | 86.0 | 64.9 | – |
| Sep 19 | 72.0 | 64.0 | – |
| Sep 20 | 72.0 | 63.0 | – |
| Sep 21 | 68.0 | 59.0 | – |
| Sep 22 | 66.9 | 57.0 | – |
| Sep 23 | 60.1 | 55.0 | – |
| Sep 24 | 66.9 | 55.0 | – |
| Sep 25 | 70.0 | 54.0 | – |
| Sep 26 | 68.0 | 50.0 | – |
| Sep 27 | 73.0 | 46.9 | – |
| Sep 28 | 73.9 | 45.0 | – |
| Sep 29 | 73.0 | 45.0 | – |
| Sep 30 | 79.0 | 52.0 | – |
The data for September 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature93.0ºF · Sep 5
- Lowest max temperature60.1ºF · Sep 23
- Highest min temperature72.0ºF · Sep 2
- Lowest min temperature45.0ºF · Sep 28
Geo Peru - Illinois
Location
- Country
- United States
- State
- Illinois
- County
- LaSalle
- City
- Peru
- Zip Code
- 61354
- Elevation
- 509 ft
- Longitude
- -89.12
- Latitude
- 41.33
- ICAO
- –
- IATA
- –