Hamilton County, IL Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across Hamilton County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy. Low around 67, with temperatures rising to around 70 overnight. South southeast wind around 7 mph.
County Weather Overview
This county weather page brings together forecast coverage for Hamilton County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 2 of 2 mapped cities in Hamilton County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 17 to May 23, 2026
- Latest sync
- May 17, 2026 2:41 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Hamilton County
Monday looks like the warmest upcoming period in Hamilton County at 89 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Tuesday at about 13 to 18 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- May 17, 2026 2:41 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Sunny, with a high near 88. South wind 7 to 15 mph, with gusts as high as 23 mph.
Mostly clear. Low around 68, with temperatures rising to around 70 overnight. South wind 8 to 14 mph, with gusts as high as 23 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. South wind 10 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. South wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 89. South southwest wind 13 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. West southwest wind 5 to 12 mph, with gusts as high as 21 mph.
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 76. North northwest wind around 9 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. North northeast wind around 9 mph.
A chance of rain showers. Partly sunny, with a high near 72. Northeast wind around 9 mph.
A slight chance of rain showers. Mostly cloudy, with a low around 55. Northeast wind 5 to 8 mph.
A slight chance of rain showers. Partly sunny, with a high near 76. Northeast wind around 7 mph.
A slight chance of rain showers. Mostly cloudy, with a low around 58. Northeast wind 2 to 6 mph.
A chance of rain showers. Partly sunny, with a high near 81. East northeast wind 3 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
May 17
|
Mostly Cloudy
|
67°F |
7 mph
SSE
|
|
Sunday
May 17
|
Sunny
|
88°F |
7 to 15 mph
S
|
|
Sunday Night
May 17
|
Mostly Clear
|
68°F |
8 to 14 mph
S
|
|
Monday
May 18
|
Mostly Sunny then Chance Showers And Thunderstorms
|
89°F |
10 to 17 mph
S
|
|
Monday Night
May 18
|
Chance Showers And Thunderstorms
|
71°F |
13 mph
S
|
|
Tuesday
May 19
|
Chance Showers And Thunderstorms
|
89°F |
13 to 18 mph
SSW
|
|
Tuesday Night
May 19
|
Showers And Thunderstorms Likely
|
65°F |
5 to 12 mph
WSW
|
|
Wednesday
May 20
|
Chance Showers And Thunderstorms
|
76°F |
9 mph
NNW
|
|
Wednesday Night
May 20
|
Chance Showers And Thunderstorms
|
55°F |
9 mph
NNE
|
|
Thursday
May 21
|
Chance Rain Showers
|
72°F |
9 mph
NE
|
|
Thursday Night
May 21
|
Slight Chance Rain Showers
|
55°F |
5 to 8 mph
NE
|
|
Friday
May 22
|
Slight Chance Rain Showers
|
76°F |
7 mph
NE
|
|
Friday Night
May 22
|
Slight Chance Rain Showers
|
58°F |
2 to 6 mph
NE
|
|
Saturday
May 23
|
Chance Rain Showers
|
81°F |
3 to 7 mph
ENE
|
Major City Forecasts
Live forecast snapshots for major cities across Hamilton County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Hamilton County.
Largest mapped city population in this region: 2,730.
