LaSalle County weather, town by town
30 places in LaSalle County, Illinois, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
LaSalle County Weather Facts
LaSalle County has 30 places on myweatherrock (16 villages, 8 cities, 6 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 112°F at Ottawa 4Sw on July 21, 1901. The coldest night is -33°F at Paw Paw 2S on February 3, 1996. The wettest day brought 9.09 inches of rain at Minonk on September 28, 2019. The biggest single-day snow measured 20 inches at Ottawa 1.3 Nw on February 2, 2011. Those are station measurements from NOAA's daily records, 1892 to 2026, not official state records. By area the largest place is Ottawa, about 15 square miles.
About LaSalle County weather
The map on the Now tab shows every LaSalle County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 30 LaSalle County towns with station normals, the warmest month is July, when the day usually reaches 84°F, and the coldest is January, when the night usually falls to 14°F. May is the wettest, with rain on about 11 days. July afternoons run from about 82°F in Earlville to 86°F in Dana. January nights run from about 12°F in Earlville to 16°F in Millington.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
LaSalle County weather records
Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
Common questions about LaSalle County weather
- What is the hottest temperature recorded at a LaSalle County station?
- 112°F at Ottawa 4Sw on July 21, 1901, in the NOAA daily station records myweatherrock holds (1892 to 2026).
- What is the coldest temperature recorded at a LaSalle County station?
- -33°F at Paw Paw 2S on February 3, 1996.
- What is the most rain a LaSalle County station has measured in one day?
- 9.09 inches at Minonk on September 28, 2019.
- What is the biggest one-day snowfall at a LaSalle County station?
- 20 inches at Ottawa 1.3 Nw on February 2, 2011.
- How many LaSalle County towns have a weather page here?
- 30: 16 villages, 8 cities, 6 census-designated places. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the LaSalle County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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