Hamilton County, IL Weather Forecast

County weather hub

67°
F

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.

Sunday, May 17, 2026
Wind: 7 mph SSE
Overnight

Mostly cloudy. Low around 67, with temperatures rising to around 70 overnight. South southeast wind around 7 mph.

County weather hub

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
Next High
88°F
Sunday
Next Low
67°F
Overnight
Rain Outlook
11
Periods mentioning precipitation
Windiest
13 to 18 mph
Tuesday

Daily Outlook

Today
May 17
Sunny
88 °F
/ 67°F
Wind 7 to 15 mph
Mon
May 18
Mostly Sunny then Chance Showers And Thunderstorms
89 °F
/ 71°F
Wind 10 to 17 mph
Tue
May 19
Chance Showers And Thunderstorms
89 °F
/ 65°F
Wind 13 to 18 mph
Wed
May 20
Chance Showers And Thunderstorms
76 °F
/ 55°F
Wind 9 mph
Thu
May 21
Chance Rain Showers
72 °F
/ 55°F
Wind 9 mph
Fri
May 22
Slight Chance Rain Showers
76 °F
/ 58°F
Wind 7 mph
Sat
May 23
Chance Rain Showers
81 °F
Wind 3 to 7 mph

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 source

Extended Forecast

Sunday
May 17
88°F
Sunny
7 to 15 mph S

Sunny, with a high near 88. South wind 7 to 15 mph, with gusts as high as 23 mph.

Sunday Night
May 17
68°F
Mostly Clear
8 to 14 mph S

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.

Monday
May 18
89°F
Mostly Sunny then Chance Showers And Thunderstorms
10 to 17 mph S

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%.

Monday Night
May 18
71°F
Chance Showers And Thunderstorms
13 mph S

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%.

Tuesday
May 19
89°F
Chance Showers And Thunderstorms
13 to 18 mph SSW

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%.

Tuesday Night
May 19
65°F
Showers And Thunderstorms Likely
5 to 12 mph WSW

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.

Wednesday
May 20
76°F
Chance Showers And Thunderstorms
9 mph NNW

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.

Wednesday Night
May 20
55°F
Chance Showers And Thunderstorms
9 mph NNE

A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. North northeast wind around 9 mph.

Thursday
May 21
72°F
Chance Rain Showers
9 mph NE

A chance of rain showers. Partly sunny, with a high near 72. Northeast wind around 9 mph.

Thursday Night
May 21
55°F
Slight Chance Rain Showers
5 to 8 mph NE

A slight chance of rain showers. Mostly cloudy, with a low around 55. Northeast wind 5 to 8 mph.

Friday
May 22
76°F
Slight Chance Rain Showers
7 mph NE

A slight chance of rain showers. Partly sunny, with a high near 76. Northeast wind around 7 mph.

Friday Night
May 22
58°F
Slight Chance Rain Showers
2 to 6 mph NE

A slight chance of rain showers. Mostly cloudy, with a low around 58. Northeast wind 2 to 6 mph.

Saturday
May 23
81°F
Chance Rain Showers
3 to 7 mph ENE

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

Tracked cities
2
Coverage
100%

Forecast coverage currently spans 2 of 2 mapped cities in Hamilton County.

Largest mapped city population in this region: 2,730.

Hamilton County Courthouse IL 2019
Hamilton County Courthouse IL 2019 image
Weather data provided by the National Weather Service (NOAA). Forecast pages update automatically as new periods are synced for each supported U.S. location.