Portland, IL Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Portland, IL in one place.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82. East wind 5 to 10 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Portland, 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 31, 2026 12:57 AM CDT.
The active forecast window currently covers Jun 1 to Jun 6, 2026 for Portland, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 1 to Jun 6, 2026
- Latest sync
- May 31, 2026 12:57 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Portland
Thursday looks like the warmest upcoming period in Portland at 88 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Thursday at about 5 to 15 mph S.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- May 31, 2026 12:57 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers before 7pm. Mostly clear, with a low around 54.
Sunny, with a high near 83.
Mostly clear, with a low around 53.
Sunny, with a high near 86.
Mostly clear, with a low around 57.
Mostly sunny, with a high near 88.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Jun 1
|
Slight Chance Showers And Thunderstorms
|
82°F |
5 to 10 mph
E
|
|
Monday Night
Jun 1
|
Slight Chance Rain Showers then Mostly Clear
|
54°F |
5 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
83°F |
5 to 10 mph
NE
|
|
Tuesday Night
Jun 2
|
Mostly Clear
|
53°F |
5 to 10 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
86°F |
5 mph
SE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
57°F |
5 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
88°F |
5 to 15 mph
S
|
|
Thursday Night
Jun 4
|
Slight Chance Showers And Thunderstorms
|
63°F |
10 mph
SW
|
|
Friday
Jun 5
|
Chance Showers And Thunderstorms
|
88°F |
10 to 15 mph
SW
|
|
Friday Night
Jun 5
|
Chance Showers And Thunderstorms
|
64°F |
10 to 15 mph
SW
|
|
Saturday
Jun 6
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
88°F |
10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Portland.