The combination of temperatures in the upper 80s to around 90 and high humidity will result in the heat index reaching 95 to 100 today and then again on Thursday. With these being the first hot days of the year, it may take some time to get acclimated to these conditions. So be extra cautious and take precautions to deal with the heat. If planning to be outdoors for extended periods drink plenty of water, where light and loose clothing, and take frequent breaks.