Hydration in the Local Climate: How Much and What to Drink

Surface temperatures on Riyadh's King Fahd Road have been recorded above 60°C on July afternoons this week. The air temperature itself hit 47°C on Tuesday. In conditions like these, the body can lose up to 1.5 litres of sweat per hour during moderate outdoor activity — a rate that makes the standard eight-glasses-a-day advice dangerously inadequate for anyone spending real time outside.

This is the peak of the Gulf summer, and the timing sharpens a question that nutrition and sports medicine specialists across the Kingdom have been pushing harder in 2026: hydration is not just about volume. The wrong fluids, taken at the wrong times, can leave the body in a worse metabolic position than mild dehydration itself.

What Riyadh's Wellness Scene Is Actually Recommending

At the Cenomi Active fitness complex on Olaya Street, trainers have started distributing a single-page hydration protocol to new members before they step onto the gym floor. The guidance aligns with the Saudi Health Council's updated physical activity recommendations, published in February 2026, which specify a minimum of 3.7 litres of total water intake per day for adult men and 2.7 litres for adult women — both figures nudged upward by 400ml from the previous edition to account for the regional climate. Women who are pregnant or breastfeeding are advised to consult a physician for adjusted targets.

The Diplomatic Quarter, where many of Riyadh's expat and international residents exercise outdoors in the early mornings, has seen a sharp rise in heat-related presentations at its medical clinic since June. Physicians there, and at the King Faisal Specialist Hospital and Research Centre on Zahrawi Street, consistently flag the same culprit: people hydrating heavily with plain water during prolonged sweating without replenishing sodium and electrolytes. The result is hyponatraemia — dangerously low blood sodium — a condition that produces symptoms almost identical to dehydration, and which plain water alone cannot fix.

The practical correction is not complicated. For sessions lasting under 45 minutes in an air-conditioned environment, plain water works fine. Beyond that, or for any outdoor activity between 9 a.m. and 6 p.m. in July, a modest electrolyte addition matters. A 500ml electrolyte drink from a pharmacy such as Nahdi or Al-Dawaa costs between SAR 8 and SAR 18, depending on brand. Coconut water, increasingly stocked at Tamimi Markets and Danube supermarkets across the city, offers a natural alternative with roughly 600mg of potassium per 330ml serving.

The Drinks to Treat With Caution

Saudi Arabia's energy drink consumption ranks among the highest per capita in the Arab world, with the market valued at over SAR 2.3 billion in 2025 according to data from the Saudi Food and Drug Authority. Caffeine above 200mg — found in several popular 500ml cans — acts as a mild diuretic and raises core body temperature, compounding heat stress rather than relieving it. Nutritionists at the wellness clinics inside the King Abdullah Financial District recommend treating energy drinks as a performance tool, not a hydration strategy, and avoiding them entirely during outdoor exposure in summer months.

Carbonated water, widely available and popular at Riyadh's café strips on Tahlia Street, is not meaningfully different from still water in terms of hydration capacity, despite persistent myths. Cold water, on the other hand, is absorbed slightly faster from the stomach than room-temperature water, making the refrigerated bottles sold at nearly every corner co-op across Al Malaz, Al Muraba and Sulaymaniyah a genuinely better choice mid-activity, not merely a comfort preference.

The simplest monitoring tool costs nothing. Urine colour remains the most reliable field indicator: pale straw signals adequate hydration; anything darker than apple juice signals the body is already playing catch-up. Start drinking before thirst arrives, because by the time the brain registers thirst in 45°C heat, fluid deficit has typically already reached one percent of body weight — enough to impair concentration and physical coordination. Anyone managing a chronic health condition should speak with a physician before making significant changes to their fluid intake. The heat will not ease until late September. The margin for getting this wrong is narrower than most residents appreciate.