From the Spaceflight Meteorology Group:

The National Weather Service has issued a Heat Advisory through 5AM CDT Sunday that includes JSC.

The heat wave continues again. Forecast maximum temperature at JSC Building 30 today is 98. The daily record for today is 97. Galveston Bay or Gulf sea breeze passage around 2PM should keep JSC temperatures under 100 but the added humidity will send heat index readings into the 106 to 110 range from 2 to 5PM. Forecast high at NASA Ellington Field is 103. Heat index readings at EFD will rise into the 108 to 113 range. NASA Ellington has reached 100 degrees or more for 18 days, today will make 19.