Diamond, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Diamond, IL in one place.
Showers and thunderstorms. Cloudy. High near 68, with temperatures falling to around 66 in the afternoon. Southeast wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Local Weather Overview
This forecast page for Diamond, 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: Oct 15, 2026 4:12 PM CDT.
The active forecast window currently covers Oct 15 to Oct 21, 2026 for Diamond, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 4:12 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Diamond
Wednesday looks like the warmest upcoming period in Diamond at 76 degrees F.
Friday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Tonight at about 10 to 20 mph WSW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 4:12 PM 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
Showers and thunderstorms likely before 1am. Cloudy. Low around 48, with temperatures rising to around 51 overnight. West southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
A chance of rain showers after 1pm. Mostly cloudy. High near 54, with temperatures falling to around 52 in the afternoon. Northwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 7pm. Mostly clear, with a low around 35. North northwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Areas of frost before 9am. Sunny, with a high near 59. West northwest wind 0 to 5 mph.
Patchy frost after 5am. Clear, with a low around 37.
Patchy frost before 7am. Sunny, with a high near 67.
Mostly clear, with a low around 40.
Mostly sunny, with a high near 71.
Partly cloudy, with a low around 42.
Mostly sunny, with a high near 74.
Mostly clear, with a low around 45.
Sunny, with a high near 76.
Mostly clear, with a low around 49.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 15
|
Showers And Thunderstorms
|
68°F |
10 mph
SE
|
|
Tonight
Oct 15
|
Showers And Thunderstorms Likely
|
48°F |
10 to 20 mph
WSW
|
|
Friday
Oct 16
|
Mostly Cloudy then Chance Rain Showers
|
54°F |
15 to 20 mph
NW
|
|
Friday Night
Oct 16
|
Chance Rain Showers then Mostly Clear
|
35°F |
10 to 20 mph
NNW
|
|
Saturday
Oct 17
|
Areas Of Frost then Sunny
|
59°F |
0 to 5 mph
WNW
|
|
Saturday Night
Oct 17
|
Clear then Patchy Frost
|
37°F |
0 to 5 mph
SSW
|
|
Sunday
Oct 18
|
Patchy Frost then Sunny
|
67°F |
5 to 10 mph
SSW
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
40°F |
0 to 5 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
71°F |
0 to 5 mph
SSW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
42°F |
0 mph
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
74°F |
0 mph
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
45°F |
0 mph
|
|
Wednesday
Oct 21
|
Sunny
|
76°F |
0 to 5 mph
SE
|
|
Wednesday Night
Oct 21
|
Mostly Clear
|
49°F |
0 mph
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Diamond.