The average sea tempeature is 13 °C (55.4 °F). The average temperature in Lisbon in February is quite mild at 12.3 °C (54.14 °F). Afternoons can be very mild with average high temperatures reaching 15.6 °C (60.1 °F). Overnight temperatures are generally a little cool with an average low of 9 °C (48.2 °F).