El Niño Summer Forecast: How Hot And Stormy Will It Be In MA?

Developing El Niño conditions could make it a hot summer in Massachusetts, according to a new forecast.

The private weather company AccuWeather said the developing climate pattern is expected to bring building heat, rounds of severe weather, and shifting regional patterns across the United States.

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Driven by warming ocean waters in the Pacific, the El Niño is likely to strengthen through the summer, influencing temperatures, storm tracks and hurricane activity, AccuWeather said.

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Boston is expected to see more 90-degree days than normal. The city averages 15 90+-degree days in a typical summer, with AccuWeather predicting between 15 and 20 this summer.

There were officially 19 90+-degree days in Summer 2025, according to the site.

In the Northeast, there could be a "late surge of heat and higher humidity," according to AccuWeather Long-Range Expert Paul Pastelok. The added humidity will boost AccuWeather RealFeel Temperatures during the day and contribute to warmer nights.

Overall, in the Northeast and mid-Atlantic, the summer is expected to trend warmer than average overall, with periodic stretches of intense heat. Thunderstorms could bring localized flooding, but longer dry spells are also possible as storm tracks shift.

If you're traveling this summer, here's what to expect in the rest of the country:

Across the South and Southeast, frequent thunderstorms and above-average rainfall are expected at times, especially as moisture increases later in the season. However, heat and humidity will still build between storm systems.

The Midwest and Ohio Valley could see a volatile mix of heat and severe weather, including an increased risk of damaging storms during peak summer months as atmospheric patterns become more active.

In the West, especially the Southwest, hot and dry conditions are expected to dominate, raising concerns about drought and wildfire risk as the summer progresses.

The emerging El Niño may also influence the Atlantic hurricane season, which is expected to be near or slightly below average overall due to wind patterns that can disrupt storm formation.

Still, forecasters caution that even a quieter season can produce dangerous storms and that impacts can vary widely by region.

Globally, scientists say El Niño conditions are likely to develop between late spring and summer, increasing the chances of extreme weather, including heavier rainfall in parts of North America and higher overall temperatures.

AccuWeather meteorologists say the evolving pattern will become more influential as summer progresses, meaning conditions later in the season could look markedly different from early summer.

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