| NWS Forecast for: Ottawa IL Issued by: National Weather Service Chicago, IL Last Update: 3:01 am CDT Aug 19, 2026 |  |
Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 68. West wind around 5 mph. Wednesday: A 20 percent chance of showers after 4pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 80. Calm wind becoming north around 5 mph in the afternoon. Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 62. Northeast wind around 5 mph. Thursday: Sunny, with a high near 80. North wind around 5 mph becoming calm. Thursday Night: Mostly clear, with a low around 62. Calm wind. Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. Saturday: Sunny, with a high near 80. Saturday Night: Mostly clear, with a low around 62. Sunday: Mostly sunny, with a high near 77. Sunday Night: Partly cloudy, with a low around 60. Monday: Mostly sunny, with a high near 78. Monday Night: Partly cloudy, with a low around 62. Tuesday: Mostly sunny, with a high near 81. | |
| Ottawa IL 41.35°N 88.85°W | |
Visit your local NWS office at: https://www.weather.gov/lot |
