Mercer County, NJ Weather Forecast
County weather hub
Patchy Fog then Chance Showers And Thunderstorms
Compare major city weather across Mercer County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Patchy fog before 8am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 89. West wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
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 6 of 6 mapped cities in Mercer County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 10 to Jul 15, 2026
- Latest sync
- Jul 8, 2026 8:37 PM EDT
- Forecast office
- PHI
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercer County
Wednesday looks like the warmest upcoming period in Mercer County at 94 degrees F.
Sunday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Friday at about 5 to 10 mph W.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 8, 2026 8:37 PM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- PHI
- Radar station
- KDIX
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. Mostly cloudy, with a low around 69. Northwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of rain showers before 5pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 66.
Mostly sunny, with a high near 84.
Partly cloudy, with a low around 64.
Mostly sunny, with a high near 86.
Mostly clear, with a low around 66.
Sunny, with a high near 91.
Mostly clear, with a low around 70.
Sunny, with a high near 94.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 10
|
Patchy Fog then Chance Showers And Thunderstorms
|
89°F |
5 to 10 mph
W
|
|
Friday Night
Jul 10
|
Chance Showers And Thunderstorms
|
69°F |
5 to 10 mph
NW
|
|
Saturday
Jul 11
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
85°F |
5 mph
N
|
|
Saturday Night
Jul 11
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
66°F |
0 to 5 mph
NE
|
|
Sunday
Jul 12
|
Mostly Sunny
|
84°F |
5 mph
NE
|
|
Sunday Night
Jul 12
|
Partly Cloudy
|
64°F |
0 to 5 mph
SE
|
|
Monday
Jul 13
|
Mostly Sunny
|
86°F |
0 to 5 mph
S
|
|
Monday Night
Jul 13
|
Mostly Clear
|
66°F |
0 to 5 mph
SW
|
|
Tuesday
Jul 14
|
Sunny
|
91°F |
0 to 5 mph
W
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
70°F |
5 mph
W
|
|
Wednesday
Jul 15
|
Sunny
|
94°F |
5 to 10 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across Mercer County.
Coverage
Forecast coverage currently spans 6 of 6 mapped cities in Mercer County.
Largest mapped city population in this region: 82,957.
