Still hitting the high 30s in Dubai? You're not imagining it, but the countdown to cooler weather has officially started. Astronomical autumn arrived in the UAE at 4.05am on Wednesday, September 23, when the sun crossed the equator and began its shift south, stretching the nights bit by bit. On the meteorological calendar, autumn began even earlier, on September 1.

So when does it actually feel cooler? The Emirates Astronomy Society's chairman, Ibrahim Al Jarwan, puts numbers on it: early autumn days average around 39°C with nights at 26°C. By early November, that drops to roughly 31°C in the day and 18°C at night, and by the winter solstice on December 22 you're looking at about 25°C and 13°C. The shift is gradual, but mid-October is when the cooler mornings become hard to miss.

Traditional Gulf seasonal markers back this up. Al Safri, the first period of autumn in old regional reckoning, began on September 6 and runs to October 15. The early stretch can still be sticky and humid, with rising moisture causing foggy, dewy mornings, but conditions improve noticeably towards mid-October. That's also when winter clouds typically roll in, rain chances climb in the second half of the season, and northerly winds pick up — in other words, prime time for outdoor dinners, desert trips and barbecues.

One extra twist this year: the National Centre of Meteorology says the current El Niño is particularly strong, and the UAE is among the regions expected to see above-average rainfall. The link is indirect, so not every downpour will be a big one, but the NCM is monitoring conditions and will flag significant weather through official channels.

There's even a change overhead. Around dawn, Gemini, Taurus and Leo dominate the eastern sky along with Sirius, Canopus and the Pleiades — stars long tied to this point in the seasonal calendar. On the ground, autumn is planting season across the Arabian Peninsula, as cooler soil makes the first half of the season ideal for sowing seeds and setting out seedlings.

For travellers, the takeaway is simple: September is still a shoulder-of-summer month with real heat, October is the turning point, and from November the UAE becomes the comfortable winter-sun destination people fly in for. If you're booking, aim for mid-October onwards for the best balance of warmth and walkability — and possibly a few surprise rain showers this season.