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Northern hemisphere autumn equinox occurs September 23, 2026

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• The 2026 autumn equinox in the northern hemisphere occurs Wednesday 23 September at 01:06 BST.
• The equinox marks the moment when the Earth's axis is perpendicular to the Sun, making day and night nearly equal in length.
• The autumn equinox in the northern hemisphere marks the start of astronomical autumn.
• The September equinox varies each year but almost always occurs on 22 or 23 September in the northern hemisphere.
• Astronomical autumn ends with the winter solstice in the middle of December.