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New Hampshire's September Serenade: From Summer Warmth to Autumn's Embrace

  • Nishadil
  • September 15, 2025
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New Hampshire's September Serenade: From Summer Warmth to Autumn's Embrace

New Hampshire is bracing for a truly quintessential September, offering a delightful blend of lingering summer warmth and the refreshing, crisp embrace of autumn. From September 14th through the 25th, residents and visitors alike can expect a dynamic stretch of weather, perfectly showcasing the Granite State's captivating seasonal transition.

Kicking off this period, the weekend of September 14th and 15th promises to be a late-summer dream.

Expect abundant sunshine, comfortably warm temperatures soaring into the upper 70s and even touching the low 80s in some areas. Humidity will remain pleasantly low, making for ideal conditions for outdoor activities, from hiking scenic trails to enjoying a final lakeside picnic. Nights will be cool and refreshing, dipping into the 50s, perfect for open windows and a restful sleep.

As we move into the middle of the following week, around September 17th to the 20th, a shift in the atmospheric pattern is on the horizon.

Clouds are expected to gradually increase, bringing with them a higher chance of scattered showers and possibly a few isolated thunderstorms. While not a washout, these days will feel a bit more unsettled. Temperatures will likely moderate slightly, settling into the low 70s, and you might notice a subtle increase in humidity, a gentle reminder of summer's last breath.

By the tail end of the forecast period, from September 21st to the 25th, New Hampshire will fully lean into its autumnal charm.

The skies are anticipated to clear once more, ushering in decidedly cooler and drier air. Daytime highs will likely reside in the comfortable 60s, while nighttime lows will dip into the brisk 40s, a sure sign that sweater weather has truly arrived. This stretch will be perfect for enjoying the nascent fall foliage and the invigorating coolness that defines a New England autumn.

In essence, New Hampshire's September 14th to 25th weather outlook is a journey through seasons.

From sun-drenched, warm days reminiscent of late August to crisp, invigorating air signaling fall's firm arrival, it's a period that offers something for everyone. Keep an eye on the forecast for any minor adjustments, but prepare to enjoy the beauty of the Granite State's incredible transition.

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Disclaimer: This article was generated in part using artificial intelligence and may contain errors or omissions. The content is provided for informational purposes only and does not constitute professional advice. We makes no representations or warranties regarding its accuracy, completeness, or reliability. Readers are advised to verify the information independently before relying on