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Old 01-17-2014, 10:36 AM
 
Location: North West Northern Ireland.
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Is the air temp always 30c over the water?
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Old 01-17-2014, 10:40 AM
 
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Nope, it's much lower in winter, at least off the coast of Kuwait. Currently both air and water temperatures are in the range of 10-15 C (the shallower water occasionally dips below 10C).
If you head southeast towards the UAE and further, the water gets warmer.
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Old 01-17-2014, 10:45 AM
 
Location: NSW
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Originally Posted by arctic_gardener View Post
If you swim off the coast of Kuwait in July and August, you can easily get heatstroke. Water temperatures are in the mid-30s C (mid 90s F) and air temperatures over the water are around 40 C (104 F). Perhaps I should start a thread on the "maximum comfortable" swimming temperature
Heat stroke?
People that have been stranded in open tropical waters will still eventually die of hypothermia, that's if they don't drown first, because eventually the body temperature cannot be maintained.
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Old 01-17-2014, 10:47 AM
 
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Originally Posted by Derek41 View Post
Heat stroke?
People that have been stranded in open tropical waters will still eventually die of hypothermia, that's if they don't drown first, because eventually the body temperature cannot be maintained.
The Persian Gulf is not a tropical ocean by any means. Tropical waters run at 26-28 C, while the Gulf runs at around 34-36 C (over 38C in shallow water). The human body is a heat-generating machine, so you don't need a water temperature of 37C to maintain homeostasis. A water temperature of approximately 32C to 33C would maintain equilibrium - any higher than this and you will indeed get heat stroke if the air is humid (but not if the air is dry as the poster from Death Valley indicated).
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Old 01-17-2014, 10:57 AM
 
Location: Estonia
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20°C with sunshine is hot enough to make a cool swim appealing. Water, maybe around 18°C or more is fine.
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Old 01-17-2014, 12:19 PM
 
Location: NSW
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Originally Posted by Hiromant View Post
20°C with sunshine is hot enough to make a cool swim appealing. Water, maybe around 18°C or more is fine.
18C is about the limit for me too, at this temp it is refreshing but can be too cool.
We often see this around the first warm spring days of the year,eg October - the ocean temp is around this temp and notably cool to most people, but tolerable if it is an unseasonably hot day.
Strangely, some of the mildest climates on Earth, eg along the Peruvian and Namibian coasts are dependent on such water temps and cool ocean currents, as is current in Swakopmund, 18C water in high summer:
Water temperature Swakopmund in January. Sea surface temperature Swakopmund in January. Swakopmund water temperature in January. Water temperature Namibia Swakopmund
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Old 01-17-2014, 12:20 PM
 
Location: South Jersey
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Originally Posted by Derek41 View Post
Heat stroke?
People that have been stranded in open tropical waters will still eventually die of hypothermia, that's if they don't drown first, because eventually the body temperature cannot be maintained.
Heat stroke is possible in very warm waters, but it's more associated with competitive swimming and high exertion. There's a big difference between 35C and 25C waters... even 25C waters can lead to hypothermia after long enough. But I doubt 35C waters would. You'd probably die of dehydration, excess salt intake, or heat stroke first.
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Old 01-17-2014, 12:26 PM
 
Location: NSW
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Quote:
Originally Posted by snj90 View Post
Heat stroke is possible in very warm waters, but it's more associated with competitive swimming and high exertion. There's a big difference between 35C and 25C waters... even 25C waters can lead to hypothermia after long enough. But I doubt 35C waters would. You'd probably die of dehydration, excess salt intake, or heat stroke first.
I am aware of the high salt content of this water in the Persian Gulf, so yes dehydration could occur first.
These are basically spa bath type water temps, stay in one for long enough and eventually you will get cool -so you have to keep moving, even with sauna like conditions outside.
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Old 01-17-2014, 12:53 PM
 
Location: North West Northern Ireland.
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Quote:
Originally Posted by arctic_gardener View Post
Nope, it's much lower in winter, at least off the coast of Kuwait. Currently both air and water temperatures are in the range of 10-15 C (the shallower water occasionally dips below 10C).
If you head southeast towards the UAE and further, the water gets warmer.
So would it be 30c in Dubai?
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Old 01-17-2014, 12:59 PM
 
Location: Top of the South, NZ
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It was 5C/45F here at about 7.00 this morning, and will probably be warm enough (water temp at >18C) to swim later this afternoon. It all depends on the sun and the (lack of ) wind
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