Weather for New England and the Northeast

**Area Forecast Discussion**
National Weather Service Boston/Norton MA
**525 AM EDT Friday July 3 2026**

**What Has Changed**

No significant changes to the forecast.

**Key Messages**

* Dangerous heatwave continues today and Independence Day. Heat indices of 100 to 110 degrees today and 95 to over 100 degrees on Independence Day.

* Isolated severe weather potential late today and tonight. Greatest risk across interior Massachusetts and Connecticut. Main risk will be isolated pockets of damaging straight line wind gusts.

* Low risk of severe weather and a few thunderstorms on Independence Day, but the greatest risk for more widespread activity currently appears to be southwest of the region.

* Relief from the heat arrives with cooler and more seasonable temperatures returning during the first half of next week. There is also the potential for some much needed rain between late Sunday and Tuesday, although confidence remains limited.

**Discussion**

**Key Message 1, Dangerous heatwave continues today and Independence Day. Heat indices of 100 to 110 degrees today and 95 to over 100 degrees on Independence Day.**

Temperatures will once again approach record levels across southern New England today. An unusually warm air mass remains in place, with temperatures about 2,500 feet above the ground, referred to by meteorologists as 925 millibar temperatures, ranging from around 81 to 84 degrees. Combined with a very warm start to the day, mostly sunny skies, and west winds, afternoon temperatures will climb rapidly.

High temperatures are expected to reach between 97 and 103 degrees across much of the region, challenging daily records. Combined with high humidity, it will feel even hotter, with heat index values ranging from 100 to 110 degrees. Even Cape Cod is expected to reach the 90s, with heat index values between 95 and 105 degrees due to the west wind.

There will be very little cooling tonight. Overnight lows will only fall to between 72 and 77 degrees, while urban areas such as Boston may remain in the upper 70s to around 80 degrees.

Independence Day will remain dangerously hot and humid. Slight cooling in the atmosphere should prevent temperatures from reaching 100 degrees in most locations, but highs between 93 and 99 degrees are still expected. Heat index values will again reach between 95 and over 100 degrees, and heat alerts remain in effect.

**Key Message 2, Isolated severe weather potential late today and tonight. Greatest risk across interior Massachusetts and Connecticut. Main risk will be isolated pockets of damaging straight line wind gusts.**

Forecasters are also monitoring the potential for thunderstorms later today and tonight. This part of the forecast remains challenging because the atmosphere will be very unstable, but there is no strong weather system to help organize storms.

An isolated thunderstorm cannot be ruled out during the late afternoon. However, the greatest chance appears to be this evening and overnight. High resolution computer forecast models, known as CAMs, suggest thunderstorms may develop west and north of southern New England before moving into the region.

The atmosphere will remain very unstable through tonight, while winds at different levels of the atmosphere will increase enough to help some storms survive as they move east. Meteorologists refer to this change in wind speed and direction with height as 0 to 6 kilometer wind shear.

The greatest chance for stronger storms remains across interior Massachusetts and Connecticut, where weather conditions are somewhat more favorable. Additional guidance from the NADOCAST and CSU machine learning forecast systems also supports this area as having the highest risk.

This remains a forecast that will depend on small scale weather features that can only be monitored closely as they develop. While isolated severe storms are the most likely outcome, there remains a small chance that a larger cluster of storms could organize and become more widespread. The lack of a stronger large scale weather system should help limit that potential.

**Key Message 3, Low risk of severe weather and a few thunderstorms on Independence Day, but the greatest risk for more widespread activity currently appears to be southwest of the region.**

A cold front will move south through the region on Independence Day, bringing another chance for thunderstorms.

Current computer guidance and machine learning forecast systems continue to suggest that the greatest threat for widespread thunderstorms and severe weather will remain southwest of southern New England. That is where the atmosphere is expected to be most unstable and where stronger weather disturbances will be located.

Across southern New England, northwest winds developing early in the day may reduce the ingredients needed for more widespread thunderstorm development. However, temperatures climbing well into the 90s, combined with cooler air moving into the upper atmosphere, will still allow a few thunderstorms to develop. A low risk for isolated severe weather remains.

**Key Message 4, Relief from the heat with cooler and more seasonable temperatures returning during the first half of next week. Also, the potential for some much needed rain may occur between late Sunday and Tuesday, but that remains uncertain.**

Long range ensemble guidance, which combines many forecast model simulations to estimate the most likely weather pattern, is in good agreement that the upper level ridge responsible for the extreme heat will weaken next week.

This will allow temperatures to return to levels that are more typical for early July.

A developing area of low pressure moving in from the west may also bring a period of much needed precipitation sometime between Sunday night and Tuesday.

Confidence in the exact timing and placement of this rainfall remains low because summertime weather is often influenced by smaller scale features that are difficult to predict several days in advance. Even so, there is growing potential for a beneficial period of rainfall early next week.