Upper St. Bernard- Including the cities of Chalmette, Meraux, and Violet 535 AM CDT Mon Jul 20 2026 ...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM CDT THIS EVENING... .TODAY...Sunny. A slight chance of showers and thunderstorms this afternoon. Highs in the mid 90s. North winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 110. .TONIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear after midnight. Humid with lows in the lower 80s. Northwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 108 early in the evening. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. Northwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 111. .TUESDAY NIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 80s. Northwest winds 10 to 15 mph. Chance of rain 40 percent. Heat index values up to 109 early in the evening. .WEDNESDAY...Mostly sunny with a chance of thunderstorms. A chance of showers. Windy with highs in the lower 90s. Northwest winds 15 to 20 mph, increasing to north 25 to 30 mph in the afternoon. Chance of rain 50 percent. Heat index values up to 109. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Breezy with lows around 80. Chance of rain 50 percent. Heat index values up to 105 early. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Breezy with highs in the lower 90s. Chance of rain 50 percent. Heat index values up to 105. .THURSDAY NIGHT...Mostly cloudy in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows around 80. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 105. .FRIDAY NIGHT...Partly cloudy. Lows around 80. Heat index values up to 105 early in the evening. .SATURDAY...Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 105. .SATURDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the upper 70s. Chance of rain 20 percent. .SUNDAY...Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 105.