The heat and humidity will be on the rise this afternoon. Temperatures will head toward 90, and it'll become noticeably more humid as well, with dewpoints rising above 70.
By tomorrow, the strong tropical high will be in control and with a more westerly wind, the full brunt of the heat will be felt, even at the coast.
With full sunshine, many towns both Saturday and Sunday will have temperatures 95 to 100 degrees. Factoring in the humidity, the heat index will be 105 to 110.
These are dangerous levels, so it’s advised to keep outdoor activities to a minimum. If you need to be outside, stay hydrated and also check frequently on the elderly and your animal friends.
An excessive heat warning is in effect until 8 p.m. Sunday. Boston has declared a heat emergency through Sunday evening, and has made advice on making it through the hot temps here. City outdoor pools will be open all weekend. The National Weather Service also has advice for staying safe in the heat.
A weak front will cross Sunday afternoon, which may cause a shower or thunderstorm. However, the main batch of showers will move in Monday afternoon into early Tuesday.
This will break the heat, then gradual clearing will take place for the middle of next week with a return to more seasonable temperatures.
Friday: Mostly sunny with increasing humidity. High near 90.
Friday Night: Partly cloudy and muggy. Lows in the mid-70s.
Saturday: Mostly sunny, very hot and humid. Highs 95-100. Heat index 105-110.
Sunday: Hazy sunshine, very hot and humid. Highs 95-100. Heat index 105-110. A chance of an afternoon shower/thunderstorm.
Monday: Increasing clouds with afternoon showers and thunderstorms. Highs near 80.
Tuesday: Morning showers, then mostly cloudy. Highs in the 70s.
This article was originally published on July 19, 2019.