There is not a specific temperature that water must be in order for it to evaporate. However, as temperature rises, evaporation typically increases because water molecules are moving more quickly. The faster they move, the more likely it is that they will break away from the pack and evaporate.
However, there are some circumstances that typically require water to be certain temperatures. For example, water freezes at 32 F or zero C. The boiling point of water is 212 F or 100 C. Though the Fahrenheit scale was popular through the mid-1970s in the English-speaking world, most countries have since begun using the Celsius scale.