Boston, MA – Sweltering heat will grip Southern New England on Tuesday, with dangerous conditions expected as temperatures soar into triple digits. In Boston, the heat index could reach 109°F by mid-afternoon, prompting the National Weather Service to issue a Heat Warning and urging residents to avoid outdoor activities and check on vulnerable neighbors.
What to Expect on Tuesday
An Extreme Heat Warning remains in effect until 8 p.m. Tuesday, covering much of Massachusetts and Rhode Island. Boston will experience a high of 103°F, and humidity levels will keep heat index values dangerously high across Suffolk, Norfolk, and Middlesex counties. There will be minimal relief overnight, with temperatures remaining uncomfortably high.
Health and Safety Tips
Stay hydrated by drinking plenty of water throughout the day. It’s important to stay in air-conditioned spaces whenever possible to avoid heat exhaustion. Limit sun exposure during the peak afternoon hours, especially between 11 a.m. and 6 p.m., when the sun is the strongest. Cooling centers across Boston will be open throughout the day to help residents stay cool. Emergency crews are on alert for signs of heat stroke, which can develop quickly in such extreme conditions.
Impact on Travel and Services
Travelers along I-90 and I-93 will experience the full force of the heat wave, with pavement temperatures expected to surpass 120°F. MBTA services will operate on a modified schedule due to heat-related delays. Commuters are urged to be prepared for disruptions and plan accordingly.
Relief on the Horizon
A slight cooldown is expected by Wednesday, though highs will still reach 90°F. Rain chances will return later in the week, offering some much-needed relief, but the heat will linger for at least a few more days.
Five-Day Forecast for Boston, MA (June 24–28)
| Day | Weather | High Temperature | Additional Information |
|---|---|---|---|
| Tuesday | Hot, sunny | 103°F | Heat index up to 109°F, light wind |
| Wednesday | PM showers possible | 90°F | Slightly cooler at night (low of 66°F) |
| Thursday | Mostly cloudy | 90°F | 40% chance of showers |
| Friday | Cloudy, PM rain possible | 83°F | – |
| Saturday | Warm and humid, showers possible late | 86°F |
Tuesday’s heat will be the most intense of the week, with a high of 103°F and a dangerous heat index reaching 109°F. It’s crucial for Boston and surrounding areas to stay hydrated, avoid prolonged exposure to the heat, and take steps to stay cool. The heat wave will begin to ease on Wednesday, but residents should still expect high temperatures throughout the week.
