Bacnotan's climate is characterized by mild temperatures throughout the year, with an average annual temperature ranging from 21-27°C. The coolest months are January and December, with temperatures rarely dipping below 10°C or rising above 32°C. March to May marks the warmest period, with temperatures consistently reaching up to 35°C. June to October is characterized by relatively stable temperatures around 24°C, while November and December experience a slight drop in temperature. The overall climate is quite consistent, making it suitable for outdoor activities year-round.