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Dashboard / Season

Pick a spot by season

The month matters more than most swimmers expect. Each month below ranks every published spot by its mean water temperature that month; open one to see the ordering and what the water is doing. The pooled annual envelope across the whole library is at the foot of this page.

January mean 5.6 °C · 2–13.5 °C warmest Pomena, Mljet
February mean 5.6 °C · 2–12.5 °C warmest Pomena, Mljet
March mean 7.1 °C · 3–13 °C warmest Fuxian Lake, Luchong shore
April mean 10 °C · 5.5–16.5 °C warmest Fuxian Lake, Luchong shore
May mean 13.7 °C · 9–20 °C warmest Fuxian Lake, Luchong shore
June mean 17 °C · 12.5–23.5 °C warmest Qiandao Lake, Laoshan Bay
July mean 19 °C · 14.5–26.5 °C warmest Qiandao Lake, Laoshan Bay
August mean 19.1 °C · 14.5–27 °C warmest Qiandao Lake, Laoshan Bay
September mean 17 °C · 12–24.5 °C warmest Qiandao Lake, Laoshan Bay
October mean 13.6 °C · 9–20 °C warmest Pomena, Mljet
November mean 9.9 °C · 5.5–17.5 °C warmest Pomena, Mljet
December mean 7.1 °C · 3–15 °C warmest Pomena, Mljet

Across all 21 published records, the month with the highest mean water temperature is August.

Annual water temperature envelope across all documented spots
The band is the coldest-to-warmest spread across every documented spot; the heavy line is the mean. At sea sites the summer peak lags the solstice by six to eight weeks.

Before you get in

Cold water is the one hazard that applies everywhere in this library. Below 15 °C the gasp reflex can make you inhale water involuntarily within seconds of immersion; below 10 °C, unacclimatised swimmers lose the ability to swim effectively within minutes. Enter gradually, keep your first session under five minutes, never swim alone, and get out while you still feel fine — the afterdrop continues after you leave the water.