The highest day temperature in May 2025 was 80°F. The lowest night temperature was 54°F. The average values for day and night temperatures during May were 69.9°F и 62.0°F respectivly.

The average sea surface temperature in May 2025 for Quarteira was 65.2°F. The maximum and minimum values were 61.2°F and 69.8°F respectively.

Most of the days in May are sunny but you can also expect cloudy and gloomy days.

Precipitation total in May for Quarteira is 0.6 in.

The average wind speed in May is 9.6 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Quarteira in May is 11.8 hours.