Yes, water boils below 100 degrees Celsius at higher altitudes.
This occurs because atmospheric pressure decreases as altitude increases. Lower atmospheric pressure reduces the energy required for water molecules to escape into the air as vapor, causing the boiling point to drop. For example:
At sea level, water boils at 100°C (212°F).
At 2,000 meters (6,561 feet), it boils at approximately 93°C (199.4°F).
The higher the altitude, the lower the boiling point of water.