Portland, IL Weather Forecast
Local 7-day forecast
Mostly 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 showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 81. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
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: Apr 16, 2026 7:02 AM CDT.
The active forecast window currently covers Apr 17 to Apr 22, 2026 for Portland, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 17 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 7:02 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Portland
Friday looks like the warmest upcoming period in Portland at 81 degrees F.
Saturday Night is the coolest period ahead with temperatures near 33 degrees F.
The strongest winds are forecast for Friday at about 10 to 20 mph S.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 7:02 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, then showers and thunderstorms. Mostly cloudy, with a low around 41. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Rain showers likely before 1pm. Mostly sunny, with a high near 50. Chance of precipitation is 60%.
Mostly clear, with a low around 33.
Sunny, with a high near 53.
Partly cloudy, with a low around 33.
Sunny, with a high near 62.
Mostly clear, with a low around 48.
Mostly sunny, with a high near 72.
Mostly clear, with a low around 50.
Sunny, with a high near 71.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Apr 17
|
Mostly Sunny then Chance Showers And Thunderstorms
|
81°F |
10 to 20 mph
S
|
|
Friday Night
Apr 17
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
41°F |
15 to 20 mph
SW
|
|
Saturday
Apr 18
|
Rain Showers Likely
|
50°F |
15 to 20 mph
NW
|
|
Saturday Night
Apr 18
|
Mostly Clear
|
33°F |
10 to 15 mph
W
|
|
Sunday
Apr 19
|
Sunny
|
53°F |
10 to 15 mph
NW
|
|
Sunday Night
Apr 19
|
Partly Cloudy
|
33°F |
5 to 10 mph
N
|
|
Monday
Apr 20
|
Sunny
|
62°F |
5 to 15 mph
SE
|
|
Monday Night
Apr 20
|
Mostly Clear
|
48°F |
10 to 15 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
72°F |
10 to 15 mph
SW
|
|
Tuesday Night
Apr 21
|
Mostly Clear
|
50°F |
10 to 15 mph
SW
|
|
Wednesday
Apr 22
|
Sunny
|
71°F |
10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Portland.