When will the first snowfall happen where you live? See our U.S. first snow map and typical first snowfall timing from September through winter.

Have you noticed your lawn suddenly soaking wet every September morning even though it hasn't rained? Longer nights, cooler temperatures, and lingering late-summer moisture create ideal conditions for heavy morning dew.

Does the night sky suddenly look brighter? September’s earlier darkness, changing weather, Moon phase, and improving atmospheric transparency can reveal stars that were hiding in plain sight all summer.

Your old knee starts aching even though the sky is still dry. Hours later, the rain arrives. Coincidence? Research suggests some people really may feel atmospheric changes before a storm.

Don’t wait for frost to bring houseplants indoors. Learn which plants should come inside at 50°F, which tolerate chilly nights, and how to avoid pests and leaf drop.

September can be a “second spring” for cool-season lawns. Learn when to seed, aerate, fertilize, dethatch and control weeds—and what to avoid during heat and drought.

September brings one of the year’s fastest changes in daylight. See how many minutes of sunshine cities across the U.S. lose during September 2026—and why northern locations like Seattle lose more than twice as much daylight as Miami.

When does the monarch butterfly migration happen? Discover when monarchs migrate in 2026, how far they fly, where they go, and how to see and help them.

Where will fall color be best in 2026? Our Farmers’ Almanac Fall Foliage Outlook points to the central Appalachians for the strongest display, with generally good prospects across much of the East and Southeast, and more mixed or spotty conditions in parts of the West, Upper Midwest, and southern tier.

Why are fall colors brighter some years? Learn how sunshine, cool nights, rain, drought, frost, and temperature determine how brilliant autumn foliage becomes.