Mercer County, OH Weather Forecast
County weather hub
Mostly Clear
Compare major city weather across Mercer County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly clear, with a low around 54. West wind around 2 mph.
County Weather Overview
This county weather page brings together forecast coverage for Mercer County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in Mercer County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Apr 17 to Apr 23, 2026
- Latest sync
- Apr 17, 2026 5:29 AM EDT
- Forecast office
- ILN
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercer County
Friday looks like the warmest upcoming period in Mercer County at 82 degrees F.
Sunday Night is the coolest period ahead with temperatures near 31 degrees F.
The strongest winds are forecast for Sunday at about 9 to 20 mph W.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 17, 2026 5:29 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- ILN
- Radar station
- KIWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly sunny, with a high near 82. South wind 1 to 7 mph.
A chance of showers and thunderstorms after 11pm. Mostly cloudy. Low around 59, with temperatures rising to around 66 overnight. South wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms. Mostly cloudy, with a high near 72. Southwest wind 15 to 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms likely before 2am. Mostly cloudy, with a low around 38. Northwest wind 9 to 16 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Mostly sunny, with a high near 54.
Partly cloudy, with a low around 31.
Sunny, with a high near 54.
Partly cloudy, with a low around 41.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 55.
A slight chance of rain showers between 8am and 2pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 75.
A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 54.
Mostly sunny, with a high near 78.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Apr 17
|
Mostly Clear
|
54°F |
2 mph
W
|
|
Friday
Apr 17
|
Mostly Sunny
|
82°F |
1 to 7 mph
S
|
|
Friday Night
Apr 17
|
Chance Showers And Thunderstorms
|
59°F |
7 to 14 mph
S
|
|
Saturday
Apr 18
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
72°F |
15 to 18 mph
SW
|
|
Saturday Night
Apr 18
|
Showers And Thunderstorms Likely
|
38°F |
9 to 16 mph
NW
|
|
Sunday
Apr 19
|
Mostly Sunny
|
54°F |
9 to 20 mph
W
|
|
Sunday Night
Apr 19
|
Partly Cloudy
|
31°F |
3 to 16 mph
NW
|
|
Monday
Apr 20
|
Sunny
|
54°F |
3 to 7 mph
N
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
41°F |
3 to 10 mph
SE
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
74°F |
10 to 18 mph
S
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
55°F |
10 to 15 mph
SW
|
|
Wednesday
Apr 22
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
75°F |
9 to 13 mph
W
|
|
Wednesday Night
Apr 22
|
Slight Chance Showers And Thunderstorms
|
54°F |
6 to 9 mph
SW
|
|
Thursday
Apr 23
|
Mostly Sunny
|
78°F |
6 to 10 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Mercer County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in Mercer County.
Largest mapped city population in this region: 10,438.
