The Limmat is clean, fast-moving, and genuinely fun once you get past the initial shock of cold water. You jump in at one of the designated spots or ladders near the old town and let the current carry you downstream for 20-40 minutes depending on where you get out. Expect a proper river swim — not a lazy float. The water is usually clear but can be chilly even in summer (14-20°C). You'll share the river with ducks, the occasional swan, and hundreds of other locals doing exactly the same thing. The scenery is surprisingly good: old buildings, bridges, and the Alps in the distance if the weather is clear.
Best time is mid-June to early September when the water temperature is highest and the days are long. The official swimming season with lifeguarded platforms runs roughly April to October, but sensible people wait until the water warms up. Expect to pay around CHF 8-25 total: a small locker or bag drop at a bathing area, maybe a drink or snack afterwards. Serious swimmers often just use the free entry points and leave a bag with a friend or at a staffed kiosk.
Pick the stretch from near the Landesmuseum down towards the lake — it's the classic route with the best flow and exit options. Skip trying it in spring or after heavy rain when the current gets strong and the water murkier. Wear water shoes if you have them; the riverbed can be stony when entering or exiting.
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