New Hampshire Embraces Autumn: A Glimpse into Late September Weather

As we approach late September 2025, New Hampshire is settling into the glorious embrace of early autumn. Residents and visitors alike are advised to prepare for a classic New England seasonal transition, marked by a delightful mix of crisp air, vibrant foliage, and the occasional reminder that winter is slowly, but surely, on its way.

Our latest forecast indicates a generally mild pattern for the upcoming days.

Daytime temperatures are expected to hover comfortably in the low to mid-60s Fahrenheit (around 16-19 degrees Celsius), creating ideal conditions for enjoying outdoor activities. However, the nights will bring a distinct chill, with temperatures dipping into the low 40s to upper 30s Fahrenheit (4-9 degrees Celsius).

This significant diurnal swing is characteristic of autumn in the Granite State, so layering remains key, especially for those venturing out in the mornings or evenings.

Precipitation chances appear to be moderate. While we anticipate several periods of sunshine, particularly in the afternoons, there's a scattered chance of light, passing showers throughout the week.

These showers are not expected to be heavy or prolonged, but they could add a refreshing dampness to the air, enhancing the fall aroma. Keep a light umbrella or a water-resistant jacket handy, just in case!

Wind conditions will generally be light to moderate, typically from the northwest, carrying that characteristic crispness of autumn.

This gentle breeze will contribute to the accelerated turning of leaves, making for picturesque landscapes across the state. Peak foliage is still a little way off for most areas, but the initial bursts of red, orange, and gold are becoming increasingly visible, especially in the northern regions.

Looking ahead, the forecast suggests a continuation of this mixed bag, with no extreme weather events currently on the horizon.

Enjoy the beautiful transition, but stay informed of localized updates. New Hampshire's autumn is a truly special time, offering breathtaking scenery and invigorating weather for all to experience.