BOSTON (CBS) – Do you remember the heat wave at the beginning of June? It really set the stage for what the rest of June became. So it should come as no surprise that another 90s, including our next heat wave, is forecast towards the end of the month.
A subtropical high known as the Bermuda High will be anchored over the Atlantic for the next week. The flow around the high pressure will introduce the heat and moisture.
Currently, 2021 ranks second for Boston for the warmest month of June ever, at 72.9 °. In the next few days, it is very likely that 2021 will beat the warmest June on record. Boston only needs an average of 79.35 degrees per day to break the June record. The daily average is found by taking the high and low and dividing by 2.
Boston was just under 90 degrees on Sunday with a high of 89, so Monday seems like the first day in the heatwave. You must have 3 consecutive days of 90 degrees or more for the route to be officially called a heat wave.
The highest temperatures are expected to occur on Monday and Tuesday. Record highs can be challenged in Boston. Highs will rise by the mid-1990s and along with sticky tropical dew points, heat indices will approach three digits.
Heat warnings have been issued for almost all of southern New England with the exception of the Cape and the Isles. Plan to cut back on outdoor activities, find shade or air conditioning, stay hydrated, and take breaks from working outdoors. Also keep in mind that the inside of the car is much hotter and in such heat it can become extremely dangerous in minutes. The heat wave will last through Wednesday before a few showers cause the heat wave to end on Thursday.
It is noteworthy that multiple heat waves that occurred exclusively in June (start / end dates both in June) occurred only once in a season – 1941. It will likely happen for 2021.
At the moment there are 8 days with 90 ° + days for Boston for the season. This is well above our previous average of 2 days. Of course we will be increasing the total number this season by July in a large scale.
Looking ahead, it looks like July 4th will be a mix of sun and clouds and temperatures in the 70s. There will be a front nearby and that can increase the likelihood of showers through to the weekend. Stay tuned when new information becomes available.