The sunlight zone, also known as the euphotic zone, is the uppermost layer of the ocean where sunlight penetrates and supports photosynthesis. Generally, this zone extends down to about 200 meters (approximately 656 feet) but can vary depending on water clarity.
In terms of temperature, the sunlight zone can vary significantly based on geographic location, season, and depth. Typically, temperatures here can range from around 10°C (50°F) to a warm 30°C (86°F) in tropical waters. The warmest temperatures are usually found near the surface during the day and can decrease with depth. In higher latitudes, the temperatures are cooler overall.
While it may be called the sunlight zone, it doesn’t mean it’s consistently warm. The temperature in these waters can fluctuate, influenced by weather patterns, ocean currents, and the time of year. Thus, while the surface might feel warm and inviting, deeper areas of the sunlight zone can present much colder conditions.