By Staff Reporter
Dubai, UAE – The United Arab Emirates’ astronomical summer will officially come to an end on September 23, 2026, when the autumnal equinox ushers in the start of autumn, according to Emirati astronomer Ibrahim Al Jarwan, Chairman of the Emirates Astronomical Society and a member of the Arab Union for Astronomy and Space Sciences.
Although astronomical autumn begins in late September, meteorologists consider September the first month of the autumn season, marking the beginning of a gradual transition away from the peak summer heat.
Al Jarwan explained that the UAE’s hottest period, traditionally known as Al Qayz, starts to lose its intensity during the final third of August with the appearance of the star Suhail. For generations, the rising of Suhail has been regarded across the Arabian Peninsula as a sign that cooler conditions are on the horizon.
Despite this seasonal shift, temperatures remain high throughout September. During this period, the Indian seasonal low-pressure system gradually weakens, while thermal low-pressure systems over central Arabia continue to influence the country’s weather. These conditions can generate active winds that stir up dust and reduce visibility.
September also remains favourable for the development of convective clouds, especially over the eastern mountain ranges. These clouds can trigger thunderstorms and occasional rainfall that may extend into inland regions of the UAE.
Wind patterns also begin to change as the season progresses. South-easterly winds typically dominate during the night and early morning before giving way to refreshing north-westerly sea breezes in the afternoon and evening.
Humidity levels steadily increase compared with August, particularly during the second half of September, creating ideal conditions for the formation of fog and mist in various parts of the country.
Astronomical summer began on June 21 with the summer solstice and lasts for three months until the autumnal equinox. During the first half of the season, daytime temperatures generally range between 41°C and 43°C, although heatwaves can push temperatures above 50°C in some areas.
From around August 11, the combination of high humidity, persistent heat and the seasonal Kous winds encourages the formation of towering thunderclouds over the Hajar Mountains, producing localized summer thunderstorms known as Al Rawayeh.
As residents continue to cope with the summer heat, many are adjusting their daily routines by scheduling outdoor activities during the cooler early morning and evening hours while spending more time in air-conditioned indoor venues.
Initiatives such as Dubai Mallathon, running from June 15 to September 15, provide residents with comfortable indoor spaces for walking and running, helping them maintain active lifestyles throughout the hottest months of the year.
With temperatures expected to gradually ease from late August onwards, outdoor parks, desert attractions, beaches during cooler hours and the UAE’s eastern mountain destinations are likely to attract increasing numbers of visitors as autumn approaches.
Source: Gulf News
