Hydration in the local climate: how much and what to drink in Edinburgh

Edinburgh sits at 55.9 degrees north, and on a July day like today the temperature is hovering around 17°C on Princes Street — hardly the kind of heat that makes you reach for a water bottle. That, say dietitians who work with NHS Lothian, is precisely the problem. The city's mild, often overcast summers lull residents into underdrinking, even as physical activity levels rise sharply during the festival build-up and long daylight hours push people outdoors well past 9pm.

Hydration rarely feels urgent here the way it might in drier European cities. But the body loses fluid at broadly the same rate regardless of whether the thermometer is nudging 17°C or 30°C, particularly during exercise. Sweat simply evaporates faster in Edinburgh's persistent westerly wind before most people notice it, which removes the obvious visual cue that you are dehydrating. Add in the fact that Edinburgh's walking culture — Holyrood Park alone logs an estimated 2.5 million visits per year — means residents routinely clock 10,000 or more steps on uneven terrain, and the deficit can compound quietly through a normal weekday.

What the numbers actually say

The European Food Safety Authority recommends 2 litres of total fluid per day for adult women and 2.5 litres for men, with around 20 percent of that typically coming from food. Those are baseline figures for sedentary adults; anyone running the Water of Leith Walkway at lunchtime or cycling the Innocent Railway path after work needs more. A 2024 survey by the British Dietetic Association found that 43 percent of UK adults fail to meet even the baseline recommendation on any given weekday, with the figure rising to 51 percent among those aged 18 to 34 — a demographic that makes up a disproportionately large slice of Edinburgh's population given the university presence on South Bridge and George Square.

Cost matters too. A 500ml bottle of branded mineral water at most Grassmarket cafés runs between £1.80 and £2.20. Edinburgh's tap water, sourced from Talla and Megget reservoirs in the Scottish Borders and distributed by Scottish Water, costs the household consumer roughly £1 per 1,000 litres — making a refillable bottle the cheapest and arguably the most environmentally sensible choice in the city. Lothian Buses introduced free water refill points at its Annandale Street depot café in March 2025 as part of a wider Zero Waste Scotland partnership, and the Refill Scotland app now lists more than 340 participating venues across the Edinburgh postcode area, including branches of Söderberg on Quartermile and the Scottish National Portrait Gallery café on Queen Street.

What to drink, and when

Plain water remains the gold standard for everyday hydration, but it is not the only option. Herbal teas, which many of the independent cafés on Bruntsfield Place and Morningside Road stock in generous variety, count toward daily fluid intake. Semi-skimmed milk provides fluid plus electrolytes. Coffee and tea, despite old warnings, contribute meaningfully to hydration at moderate consumption — the mild diuretic effect of caffeine does not cancel out the fluid content unless you are drinking more than four or five strong cups a day.

Sports drinks are a different matter. Most contain between 6g and 8g of sugar per 100ml, placing them alongside fizzy drinks in terms of dental and metabolic impact. Dietitians associated with the Healthy Working Lives programme — which operates across Edinburgh businesses including several large financial services firms in the Exchange district — generally advise reserving electrolyte drinks for exercise sessions lasting longer than 90 minutes. For everything shorter, water works.

A practical rule that holds in Edinburgh's climate: drink 300ml of water before leaving the house in the morning, carry a 750ml reusable bottle during any activity longer than 45 minutes, and treat thirst as a lagging indicator rather than a reliable prompt. By the time you feel thirsty in a cool Scottish breeze, you are already running a small deficit. Check urine colour — pale straw is the target; anything darker than apple juice means you need to drink now. And if the Fringe crowds and summer walking tours are pulling you up Calton Hill this month, start drinking before you start climbing. The hill will feel significantly shorter for it.

For personalised nutrition advice, consult a registered dietitian through NHS Lothian or a private practitioner registered with the British Dietetic Association.

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