Spring equinox 2026: What South Africans should know about 23 September

What is happening and when

According to The South African, the spring equinox for South Africa occurs on 23 September 2026 at 02:05 SAST. That moment is when the sun crosses directly over the equator on its way south, marking the official start of astronomical spring for the Southern Hemisphere.

Why the equinox matters

An equinox happens when Earth’s axis is not tilted toward or away from the Sun, so the sun sits directly above the equator and day and night are nearly equal in length. The South African article explains that this alignment is one of only two moments each year when the planet’s hemispheres are briefly on equal footing.

Equal day and night a useful shorthand

The idea that day and night are exactly equal on the equinox is an approximation. The South African notes two reasons the split is not perfectly 12 hours: the sun appears as a disc rather than a point, and atmospheric refraction makes the sun visible slightly before geometric sunrise and slightly after geometric sunset. As a result, the true 12-hour split, sometimes called the “equilux,” can fall a few days before or after the equinox depending on latitude.

How South African skies and seasons change after the equinox

The South African reports that from the equinox until the December solstice, South Africa’s days grow longer and the sun’s path through the sky climbs higher. This seasonal shift brings the country toward spring conditions and is associated with more reliable outdoor weather in the months that follow.

Local seasonal markers

The South African highlights a few seasonal signs that often line up around spring: jacarandas beginning to bud in Pretoria and Johannesburg, the winding down of the Cape’s whale-watching season, and the West Coast wildflower bloom typically already being in progress.

Sunrise and sunset on the equinox

On the morning of 23 September 2026, the sun will rise almost exactly due east and set almost exactly due west a pattern that occurs only twice each year, The South African says. For South Africa, the publication describes the equinox as the official handover from winter to spring, with that due-east sunrise as one of its neat markers.

According to The South African, the spring equinox on 23 September 2026 at 02:05 SAST marks the moment the sun crosses the equator and signals the start of astronomical spring for South Africa.