Rosh Hashanah 2026 begins at sundown on Friday, September 11, and ends at nightfall on Sunday, September 13, 2026. The two-day holiday opens the Jewish year 5787 and is observed on the first and ...

The great fall bird migration of 2026 is underway across North America. But there’s a reason you may not see much of it: Some of the biggest movements happen high above us while we’re sleeping. Step ...

Have you noticed the evenings suddenly getting shorter? You’re not imagining it. September is one of the most dramatic months of the year for changing daylight in the Northern Hemisphere. Between ...

Every fall, one of the most extraordinary migrations on Earth unfolds almost unnoticed above our gardens, fields, highways, and backyards. A butterfly weighing less than a paperclip sets off on a ...

The Atlantic hurricane season reaches its climatological peak around September 10. Here’s why storms are historically most ...

That crisp 50-degree morning followed by a warm, almost summery afternoon isn’t your imagination. September creates the perfect setup for big temperature swings—and the rapidly lengthening nights are ...

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 ever picked up one of those winged maple seeds, tossed it into the air, and watched it twirl toward the ground like a tiny aircraft? You’re looking at what millions of people call a maple ...

The calendar says fall begins on one date. Meteorologists say another. But trees, birds, butterflies, and frost may tell an ...

The Atlantic hurricane season reaches its climatological peak around September 10. Here’s why storms are historically most likely now—and why ...

The next full Moon is September’s Harvest Moon on Saturday, September 26, 2026. Find the exact time, why it’s called the ...