Markham, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Markham, IL in one place.
A slight chance of rain showers after 5am. Mostly cloudy. Low around 48, with temperatures rising to around 52 overnight. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Markham, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: May 15, 2026 2:48 AM CDT.
The active forecast window currently covers May 15 to May 21, 2026 for Markham, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 15 to May 21, 2026
- Latest sync
- May 15, 2026 2:48 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Markham
Sunday looks like the warmest upcoming period in Markham at 85 degrees F.
Overnight is the coolest period ahead with temperatures near 48 degrees F.
The strongest winds are forecast for Tuesday at about 20 to 25 mph SW.
Precipitation is mentioned in 13 upcoming forecast periods.
Forecast Details
- Last updated
- May 15, 2026 2:48 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers before 10am. Partly sunny, with a high near 72. South southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. Southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 61. South southwest wind 5 to 10 mph. Chance of precipitation is 60%.
Rain showers likely before 7am. Mostly sunny, with a high near 85. Chance of precipitation is 60%.
Mostly clear, with a low around 66.
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 83.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
A chance of rain showers before 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 85.
Showers and thunderstorms likely. Mostly cloudy, with a low around 57.
A chance of rain showers. Mostly sunny, with a high near 72.
A chance of rain showers before 1am. Mostly cloudy, with a low around 51.
A slight chance of rain showers after 1pm. Partly sunny, with a high near 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
May 15
|
Slight Chance Rain Showers
|
48°F |
5 to 10 mph
SSE
|
|
Friday
May 15
|
Chance Rain Showers then Partly Sunny
|
72°F |
10 to 15 mph
SSW
|
|
Friday Night
May 15
|
Partly Cloudy then Chance Showers And Thunderstorms
|
58°F |
10 to 15 mph
S
|
|
Saturday
May 16
|
Showers And Thunderstorms
|
82°F |
10 mph
SW
|
|
Saturday Night
May 16
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
61°F |
5 to 10 mph
SSW
|
|
Sunday
May 17
|
Rain Showers Likely then Mostly Sunny
|
85°F |
10 to 20 mph
S
|
|
Sunday Night
May 17
|
Mostly Clear
|
66°F |
15 to 20 mph
S
|
|
Monday
May 18
|
Chance Showers And Thunderstorms
|
83°F |
15 to 20 mph
SSW
|
|
Monday Night
May 18
|
Chance Showers And Thunderstorms
|
68°F |
20 mph
SSW
|
|
Tuesday
May 19
|
Showers And Thunderstorms Likely
|
85°F |
20 to 25 mph
SW
|
|
Tuesday Night
May 19
|
Showers And Thunderstorms Likely
|
57°F |
10 to 15 mph
WSW
|
|
Wednesday
May 20
|
Chance Rain Showers
|
72°F |
10 mph
NW
|
|
Wednesday Night
May 20
|
Chance Rain Showers
|
51°F |
5 to 10 mph
NNE
|
|
Thursday
May 21
|
Partly Sunny then Slight Chance Rain Showers
|
69°F |
10 to 15 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Markham.