National Weather Service Forecast for: Monmouth Junction NJ
Issued by: National Weather Service Philadelphia, PA
Updated: 4:12 pm EDT Jun 22, 2025
 
Overnight

Overnight: Mostly clear, with a low around 76. Calm wind.
Mostly Clear

 Monday

Monday: Sunny and hot, with a high near 98. Heat index values as high as 109. Calm wind becoming northwest around 5 mph.
Hot

 Monday
Night
Monday Night: Mostly clear, with a low around 78. South wind around 5 mph becoming calm.
Mostly Clear

 Tuesday

Tuesday: Sunny and hot, with a high near 102. Calm wind becoming west around 5 mph in the afternoon.
Hot

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 78. West wind around 5 mph becoming calm.
Mostly Clear

 Wednesday

Wednesday: A slight chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Chance of precipitation is 20%.
Sunny then
Slight Chance
T-storms
 Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 72.
Mostly Cloudy

 Thursday

Thursday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.
Partly Sunny
then Chance
T-storms
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.
Chance
T-storms
Lo 76 °F Hi 98 °F Lo 78 °F Hi 102 °F Lo 78 °F Hi 97 °F Lo 72 °F Hi 90 °F Lo 68 °F

Extreme Heat Warning
Air Quality Alert
 

Overnight
 
 Mostly clear, with a low around 76. Calm wind.
Monday
 
 Sunny and hot, with a high near 98. Heat index values as high as 109. Calm wind becoming northwest around 5 mph.
Monday Night
 
 Mostly clear, with a low around 78. South wind around 5 mph becoming calm.
Tuesday
 
 Sunny and hot, with a high near 102. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 78. West wind around 5 mph becoming calm.
Wednesday
 
 A slight chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Chance of precipitation is 20%.
Wednesday Night
 
 Mostly cloudy, with a low around 72.
Thursday
 
 A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.
Thursday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.
Friday
 
 A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 40%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
Saturday
 
 A chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Chance of precipitation is 50%.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Sunday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Monmouth Junction NJ.