When will autumn 2026 begin astronomically?
The autumnal equinox will occur on Wednesday, September 23, marking the end of summer and the beginning of a new season during which the weather will gradually improve, particularly with a decrease in temperatures and humidity levels.
Following the autumnal equinox, daylight hours gradually decrease while nighttime hours increase in the Northern Hemisphere, leading to a gradual change in weather patterns as autumn progresses.
Autumn begins astronomically on Wednesday, September 23, and lasts for 89 days and 20 hours, while the winter season begins on Monday, December 21, and lasts for 88 days and 23 hours.
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