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Marseilles, IL 61341 Weather
Current conditions
Observed at Pontiac Municipal Airport · 1 hr ago
Forecast
10-day-
Today
Sunny. High near 71, with temperatures falling to around 69 in the afternoon. East southeast wind 0 to 5 mph.
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Tonight
Clear. Low around 42, with temperatures rising to around 44 overnight. East northeast wind 0 to 5 mph.
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Wednesday
Sunny. High near 74, with temperatures falling to around 70 in the afternoon. West southwest wind around 0 mph.
National Weather Service forecast updated 6 hrs ago.
Hourly
Hourly forecast- Now71°
- 5 PM69°
- 6 PM64°
- 7 PM60°
- 8 PM57°
- 9 PM55°
- 10 PM53°
- 11 PM51°
- Wed12 AM50°
- 1 AM49°
- 2 AM47°
- 3 AM46°
- 4 AM45°
- 5 AM44°
- 6 AM43°
- 7 AM42°
- 8 AM44°
- 9 AM51°
- 10 AM57°
- 11 AM62°
- 12 PM66°
- 1 PM70°
- 2 PM72°
- 3 PM72°
10-day forecast
Details- TodayOct 20Sunny42°71°
- WedOct 21Sunny46°74°
- ThuOct 22Sunny48°74°
- FriOct 23Sunny48°72°
- SatOct 24Mostly Sunny51°72°
- SunOct 25Partly Sunny50°74°
- MonOct 26Partly Sunny15%46°69°
- TueOct 27Cloudy45°55°
- WedOct 28Rain0.08 in45°51°
- ThuOct 29Sunny41°56°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Marseilles
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueModerate
- WedModerate
- ThuModerate
Joliet and Will County, IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyOttawa 4sw, records since 1890. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Aurora 57 km
- Joliet 55 km
- Plainfield 53 km
- Oswego 49 km
- Crest Hill 56 km
- Montgomery 53 km
- Yorkville 40 km
- Ottawa 12 km
- Shorewood 46 km
- Morris 23 km
- Streator 26 km
- Channahon 40 km
Forecasters' discussion
From the National Weather Service office in LOT, issued 2 hrs ago
Key Messages
- Areas of fog, including potentially dense fog, may develop again late tonight into early Wednesday morning in and near the Chicago metro.
- An extended period of dry and above to much above average temperatures is expected through the upcoming weekend.
Discussion
Issued at 226 PM CDT Tue Oct 20 2026
An Omega block that is in place over the CONUS is expected to persist through the end of the week. The associated ridge axis will only ever so slowly crawl eastward over the coming days, which will maintain broad surface high pressure across the region. As a result, dry conditions with an abundance of sunshine will continue through the remainder of the week with high temperatures remaining above to well above normal for this time of year. Daily lake breezes will cause the coolest (low- mid 60s) high temperatures to be observed near Lake Michigan each day.
Much like last night/early this morning, optimal radiational cooling conditions will likely allow for fog to develop late tonight into tomorrow morning and possibly again in the coming nights/mornings. This will particularly be the case in and near the Chicago metro within the footprint of the marine-influenced air brought inland during the daytime, where the fog could become dense once again.
There is pretty good ensemble agreement at this point in time that the blocking pattern will break down by early next week. This will allow for a cold front to drop through the region sometime on Monday or Tuesday, resulting in a return to cooler and more seasonable temperatures for the middle of next week. The frontal passage may bring a chance for precipitation to the area early-mid next week, but support for this across the latest suite of ensemble guidance is not ubiquitous, and there are considerable temporal differences with when this next potential opportunity for precipitation may arrive as well.
Ogorek
Aviation
Issued at 1255 PM CDT Tue Oct 20 2026
Key aviation forecast messages:
- IFR or lower VSBYs in BR/FG may develop again early WED AM.
The primary concern through the period is the potential for fog near Lake Michigan early Wednesday morning, some of which may become locally dense. Model guidance that performed well with this morning's dense fog depicts another round of fog development over a similar area and extends slightly farther southeast. Have accordingly included MDW with the reduced VSBYs as low as 1 SM with this update to hint at increasing confidence in fog development. If this signal persists and additional guidance begins to pick up on the potential for dense fog, LIFR (or lower) conditions may need to be introduced with later updates.
Otherwise winds will remain light (under 10 kt) initially out of the SE, turning E to ENE behind a weak lake breeze this afternoon. Winds then ease and become light and variable again overnight eventually settling into a SSW direction after daybreak Wednesday.
Petr
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.