National Weather Service Forecast for: Monmouth Junction NJ
Issued by: National Weather Service Philadelphia, PA
Updated: 4:07 am EDT Jun 22, 2026
 
Today

Today: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Some of the storms could be severe and produce heavy rainfall. Cloudy, with a high near 78. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
Chance
Showers then
Severe
T-Storms
 Tonight

Tonight: Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Some of the storms could be severe and produce heavy rainfall. Low around 66. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Severe
T-Storms
then Heavy
Rain
 Tuesday

Tuesday: Showers likely before 2pm, then a slight chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 79. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 61. Northwest wind around 10 mph.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 84. Northwest wind 5 to 10 mph.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 61.
Mostly Clear

 Thursday

Thursday: A chance of showers after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Mostly Sunny
then Chance
Showers
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms, then showers likely after 2am. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
 Friday

Friday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
Showers
Likely
Hi 78 °F Lo 66 °F Hi 79 °F Lo 61 °F Hi 84 °F Lo 61 °F Hi 87 °F Lo 63 °F Hi 85 °F

Flood Watch
 

Today
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Some of the storms could be severe and produce heavy rainfall. Cloudy, with a high near 78. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
Tonight
 
 Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Some of the storms could be severe and produce heavy rainfall. Low around 66. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
 
 Showers likely before 2pm, then a slight chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 79. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
 Mostly clear, with a low around 61. Northwest wind around 10 mph.
Wednesday
 
 Sunny, with a high near 84. Northwest wind 5 to 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 61.
Thursday
 
 A chance of showers after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Thursday Night
 
 A chance of showers and thunderstorms, then showers likely after 2am. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Friday
 
 Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
Friday Night
 
 Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Saturday
 
 Mostly sunny, with a high near 83.
Saturday Night
 
 Partly cloudy, with a low around 64.
Sunday
 
 Mostly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Monmouth Junction NJ.