Portland, IL Weather Forecast
Local 7-day forecast
Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Portland, IL in one place.
A chance of rain showers between 1pm and 4pm, then a chance of showers and thunderstorms. Sunny, with a high near 93. Southwest wind 0 to 5 mph. Chance of precipitation is 30%.
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: Jul 15, 2026 2:49 AM CDT.
The active forecast window currently covers Jul 16 to Jul 21, 2026 for Portland, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 16 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 2:49 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Portland
Thursday looks like the warmest upcoming period in Portland at 93 degrees F.
Monday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 2:49 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 chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
A chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Sunny, with a high near 91. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly clear, with a low around 72. Chance of precipitation is 60%.
Sunny, with a high near 92.
Mostly clear, with a low around 70.
Sunny, with a high near 90.
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90.
A slight chance of rain showers before 7pm, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 68.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 85.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 16
|
Sunny then Chance Showers And Thunderstorms
|
93°F |
0 to 5 mph
SW
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
5 mph
S
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
91°F |
5 mph
SW
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
72°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Sunny
|
92°F |
5 to 10 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
70°F |
5 to 10 mph
N
|
|
Sunday
Jul 19
|
Sunny
|
90°F |
5 to 10 mph
E
|
|
Sunday Night
Jul 19
|
Mostly Clear then Slight Chance Showers And Thunderstorms
|
70°F |
5 mph
S
|
|
Monday
Jul 20
|
Slight Chance Showers And Thunderstorms
|
90°F |
5 to 15 mph
W
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
68°F |
5 to 10 mph
NW
|
|
Tuesday
Jul 21
|
Slight Chance Rain Showers then Mostly Sunny
|
85°F |
10 to 15 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Portland.