The temperature of the Weeki Wachee River varies throughout the year but is generally consistent and cool. The river's temperature is dependent on the water flow and the air temperature, which can change according to the season.

In the winter, the river temperature can drop to the low 60s Fahrenheit, while in the summer, it can reach up to the mid-70s Fahrenheit. However, the water temperature of the spring, which feeds the river, is around 72 degrees Fahrenheit year-round.

The cool temperature of the Weeki Wachee River is one of its unique features and provides a refreshing and invigorating experience for swimmers and water sports enthusiasts, especially during the hot Florida summers. It's important to note that the water temperature can be colder than expected, so it's a good idea to check the water temperature before swimming and to wear appropriate clothing and gear.