| NWS Forecast for: Ontario WI Issued by: National Weather Service La Crosse Last Update: 1:56 pm CDT Sep 16, 2026 |  |
| Tonight: A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 57. East wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible. Thursday: A 10 percent chance of showers before 7am. Mostly cloudy, with a high near 76. Calm wind. Thursday Night: Mostly cloudy, with a low around 54. Calm wind. Friday: Showers, with thunderstorms also possible after 4pm. High near 71. Light east wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible. Friday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 59. Southeast wind 8 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible. Saturday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. High near 74. Southeast wind around 8 mph becoming north in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 54. Northeast wind 5 to 9 mph, with gusts as high as 20 mph. Sunday: A 30 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 66. East wind 7 to 11 mph, with gusts as high as 21 mph. Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 50. East wind 5 to 10 mph, with gusts as high as 22 mph. Monday: A 50 percent chance of showers. Mostly cloudy, with a high near 64. East wind 6 to 8 mph, with gusts as high as 18 mph. Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 49. East wind around 6 mph becoming calm in the evening. Tuesday: A 30 percent chance of showers. Partly sunny, with a high near 67. Calm wind becoming east around 6 mph in the morning. Tuesday Night: Partly cloudy, with a low around 49. Calm wind. Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 71. Calm wind becoming south around 5 mph in the afternoon. | |
| Ontario WI 43.73°N 90.58°W | |
Visit your local NWS office at: https://www.weather.gov/arx |
