The highest day temperature in May 2025 was 82°F. The lowest night temperature was 53°F. The average values for day and night temperatures during May were 71.9°F и 59.4°F respectivly.

The average sea surface temperature in May 2025 for Portimao was 64.0°F. The maximum and minimum values were 62.0°F and 68.2°F respectively.

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

Precipitation total in May for Portimao is 0.7 in.

The average wind speed in May is 9.8 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 Portimao in May is 11.7 hours.