{"id":4615,"date":"2025-06-21T12:58:20","date_gmt":"2025-06-21T16:58:20","guid":{"rendered":"https:\/\/us.weatheramerica.com\/?p=4615"},"modified":"2025-06-27T04:14:13","modified_gmt":"2025-06-27T08:14:13","slug":"weather-boston-heat-dome-to-bring-triple-digit-temperatures","status":"publish","type":"post","link":"https:\/\/weatheramerica.com\/us\/2025\/06\/21\/weather-boston-heat-dome-to-bring-triple-digit-temperatures\/","title":{"rendered":"Weather Boston: Heat dome to bring triple-digit temperatures"},"content":{"rendered":"
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A dangerous heat dome is forecast to engulf much of the Eastern United States, with Boston<\/em> at risk of reaching 100\u00b0F (38\u00b0C) next week \u2014 a rare and potentially historic event.<\/strong><\/p>\n

Extreme heat watch in effect from Sunday through Tuesday<\/strong><\/h2>\n

A massive dome of high pressure<\/strong>, or \u201cheat dome,\u201d<\/strong> is projected to expand across the East Coast<\/strong>, sending temperatures soaring<\/strong> across Massachusetts<\/strong>. This weather phenomenon<\/strong> will trap hot air over the region, resulting in oppressive heat<\/strong> and little to no relief overnight<\/strong>.<\/p>\n

The National Weather Service<\/strong> has issued an extreme heat watch<\/strong> effective from Sunday morning<\/strong> through Tuesday evening<\/strong> for much of eastern and central Massachusetts<\/strong>, including Suffolk<\/strong>, Plymouth<\/strong>, Bristol<\/strong>, Norfolk<\/strong>, Middlesex<\/strong>, Essex<\/strong>, Worcester<\/strong>, Franklin<\/strong>, Hampshire<\/strong>, and Hampden Counties<\/strong>.<\/p>\n

<\/h2>\n

Boston could hit 100\u00b0F \u2014 a rare milestone<\/strong><\/h2>\n

Monday and Tuesday<\/strong> appear to be the most intense<\/strong> of the upcoming heat event. Forecast models<\/strong> show daytime highs<\/strong> pushing into the upper 90s\u00b0F (35\u201337\u00b0C)<\/strong>, with a real possibility of touching 100\u00b0F (38\u00b0C)<\/strong> in Boston<\/strong> and surrounding suburbs<\/strong> by Tuesday afternoon<\/strong>.<\/p>\n

If Boston<\/strong> hits the century mark<\/strong>, it would be only the 28th time on record<\/strong> and the first since 2022<\/strong>. It would also tie the all-time June high<\/strong>, last reached in 2021<\/strong>. The current record for June 25<\/strong> stands at 95\u00b0F (35\u00b0C)<\/strong>, set in 2013<\/strong> \u2014 and forecasters expect it to be broken<\/strong>.<\/p>\n

<\/h2>\n

Heat wave timing coincides with solstice and strongest sun angle<\/strong><\/h2>\n

This heat wave<\/strong> is arriving just as summer officially begins<\/strong>, with the solstice<\/strong> occurring at 10:42 p.m. on Friday<\/strong>. These are New England\u2019s longest days of the year<\/strong>, and the sun is at its highest angle<\/strong>, meaning the UV index<\/strong> and solar heating<\/strong> are at their peak. That combination amplifies the intensity<\/strong> of this upcoming heat event<\/strong>.<\/p>\n

While some areas may remain just below 90\u00b0F (32\u00b0C)<\/strong> on Sunday<\/strong>, others will already begin the climb. Wednesday<\/strong> is currently forecast to top out in the mid-80s\u00b0F (29\u201330\u00b0C)<\/strong>, but that is subject to change as the weather pattern evolves<\/strong>.<\/p>\n

<\/h2>\n

Record-challenging heat likely in suburbs and rural towns<\/strong><\/h2>\n

Areas outside Boston<\/strong>, including interior towns in Middlesex<\/strong>, Worcester<\/strong>, and Hampden Counties<\/strong>, may see even higher temperatures<\/strong> than the coast. Local conditions, including urban heat retention<\/strong> and lack of coastal breeze<\/strong>, could cause heat indices<\/strong> to climb well over 100\u00b0F (38\u00b0C)<\/strong>, creating dangerous conditions<\/strong> especially in areas without adequate shade or cooling infrastructure<\/strong>.<\/p>\n

<\/h2>\n

Brief relief possible later in the week<\/strong><\/h2>\n

A pattern shift<\/strong> may bring some cooling<\/strong> by late next week<\/strong>, along with the potential for isolated thunderstorms<\/strong>. However, until then, oppressive heat and humidity<\/strong> are expected to dominate the forecast across Massachusetts<\/strong>.<\/p>\n

Stay alert to heat-related warnings<\/strong>, especially in Boston<\/strong> and other densely populated areas<\/strong> where the urban heat island effect<\/strong> can make nights just as unbearable as the daytime.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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A dangerous heat dome is forecast to engulf much of the Eastern United States, with Boston at risk of reaching 100\u00b0F (38\u00b0C) next week \u2014 a rare and potentially historic event. Extreme heat watch in effect from Sunday through Tuesday A massive dome of high pressure, or \u201cheat dome,\u201d is projected to expand across the […]<\/p>\n","protected":false},"author":15,"featured_media":4617,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4615","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news"],"yoast_head":"\nWeather Boston: Heat dome to bring triple-digit temperatures - United States - Weather America<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/weatheramerica.com\/us\/2025\/06\/21\/weather-boston-heat-dome-to-bring-triple-digit-temperatures\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Weather Boston: Heat dome to bring triple-digit temperatures - United States - Weather America\" \/>\n<meta property=\"og:description\" content=\"A dangerous heat dome is forecast to engulf much of the Eastern United States, with Boston at risk of reaching 100\u00b0F (38\u00b0C) next week \u2014 a rare and potentially historic event. 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