There is reduced visibility: Swimming in low light or after dark can be dangerous, especially if you're in an ocean, river or lake.
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Stay out of the water ifCloudy water can be a warning that there are more germs in the water than normal. Discolored or smelly water could mean there is a harmful algal bloom (HAB) in the water.
Swimming after dark is one of the best ways to avoid getting a sunburn or irritating existing burns. Your muscles are at their peak: By the end of the day, your body has spent hours stretching and moving. Your muscles are limber and warmed up, which can make your workout more effective.
If there is scum or algae visible in the water, it won't be clean enough to swim in. There are also natural hazards to outdoor waters compared with pools, especially in the summer. Blue-green algae is a type of bacteria naturally found in lake ecosystems.
Lake Drownings are Especially CommonIt is easier to drown in freshwater than in saltwater. Lake waters are dark and murky – it harder to spot someone who is drowning. Ice on lakes can be thinner than expected, causing someone to fall through and drown.