National Weather Service Forecast for: Monmouth Junction NJ
Issued by: National Weather Service Philadelphia, PA
Updated: 4:28 pm EDT Jul 28, 2026
 
Tonight

Tonight: Showers and possibly a thunderstorm, mainly before 3am, then a chance of showers and thunderstorms after 3am. Some of the storms could be severe and produce heavy rainfall. Low around 64. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Severe
T-Storms
then Showers
 Wednesday

Wednesday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Northwest wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Chance
Showers
 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Northwest wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
Showers
 Thursday

Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 79. North wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely
 Thursday
Night
Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 61. North wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely then
Partly Cloudy
 Friday

Friday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Sunny then
Slight Chance
T-storms
 Friday
Night
Friday Night: Partly cloudy, with a low around 63.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 85.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly cloudy, with a low around 65.
Mostly Cloudy
Lo 64 °F Hi 79 °F Lo 61 °F Hi 79 °F Lo 61 °F Hi 84 °F Lo 63 °F Hi 85 °F Lo 65 °F

Flood Watch
Severe Thunderstorm Watch
 

Tonight
 
 Showers and possibly a thunderstorm, mainly before 3am, then a chance of showers and thunderstorms after 3am. Some of the storms could be severe and produce heavy rainfall. Low around 64. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday
 
 A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Northwest wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Northwest wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 79. North wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
 Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 61. North wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
 
 A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Friday Night
 
 Partly cloudy, with a low around 63.
Saturday
 
 Mostly sunny, with a high near 85.
Saturday Night
 
 Mostly cloudy, with a low around 65.
Sunday
 
 A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Sunday Night
 
 A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Monday
 
 A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Monday Night
 
 A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
 
 A chance of showers. Mostly sunny, with a high near 84. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Monmouth Junction NJ.