National Weather Service Forecast for: Union NY
Issued by: National Weather Service Binghamton, NY
Updated: 12:11 pm EDT Jun 30, 2026
 
This
Afternoon
This Afternoon: A chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 90. Heat index values as high as 96. Southwest wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms

 Tonight

Tonight: A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Slight Chance
Showers
 Wednesday

Wednesday: A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny and hot, with a high near 93. Heat index values as high as 105. West wind 5 to 7 mph. Chance of precipitation is 30%.
Chance
T-storms

 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, mainly before 7pm. Mostly clear, with a low around 73. Light southwest wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Mostly Clear
 Thursday

Thursday: Sunny and hot, with a high near 94. Light west wind increasing to 5 to 9 mph in the morning.
Hot

 Thursday
Night
Thursday Night: Mostly clear, with a low around 73.
Mostly Clear

 Friday

Friday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Mostly Sunny
then Chance
T-storms
 Friday
Night
Friday Night: A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Chance
T-storms then
Mostly Cloudy
 Independence
Day
Independence Day: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Showers
Likely
Hi 90 °F Lo 71 °F Hi 93 °F Lo 73 °F Hi 94 °F Lo 73 °F Hi 90 °F Lo 68 °F Hi 86 °F

Hazardous Weather Outlook
Extreme Heat Warning
Heat Advisory
 

This Afternoon
 
 A chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 90. Heat index values as high as 96. Southwest wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
 
 A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny and hot, with a high near 93. Heat index values as high as 105. West wind 5 to 7 mph. Chance of precipitation is 30%.
Wednesday Night
 
 A chance of showers and thunderstorms, mainly before 7pm. Mostly clear, with a low around 73. Light southwest wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 Sunny and hot, with a high near 94. Light west wind increasing to 5 to 9 mph in the morning.
Thursday Night
 
 Mostly clear, with a low around 73.
Friday
 
 A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Friday Night
 
 A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Independence Day
 
 Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Saturday Night
 
 A chance of showers before 8pm. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Sunday
 
 A chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Sunday Night
 
 A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Monday
 
 A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 40%.

 

Forecast from NOAA-NWS for Union NY.