The proximity of the Mediterranean Sea greatly influences the Algarvian climate. Summers are hot and dry and winters are mild with hardly any rain (50 days with rain and 500 mm on average each year), combined with very inviting springs and autumns.
19-05-2013 at 10:41 Daily Weather Report
Update 1300hrs - we have had a couple of short, sharp, showers since I last wrote.
Last night the temperature dropped to 13C. A little cold for the time of year. Temperature today at 1030am was exactly 18C, there are some high clouds and it is windy.
Expecting a high today of 19C, about the same as yesterday.
The radar shows some scattered showers to the west and one fairly heavy looking one to the north of Lagos. The wind is coming from that way, so worth keeping an eye on the sky for any black clouds.
Tonight will be fairly cool again, tomorrow a bit warmer and less windy but still the chance of a shower, then Tuesday a bit warmer still and less cloudy.
Warmer weather is forecast from Wednesday onwards, more like late May should be at 24 or 25C.
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What temperatures to expect along the year.
The sea water temperature starts at around 14ºC in January and reaches a high 22ºC in August. A pleasant sea breeze refreshes the average annual temperature of the region, which is 17,7ºC (15ºC in January and up to 28ºC or more in July and August).
The Algarve can also count on around 3.000 hours of Sun during the year which makes it a favourite destination for those who fancy such a delightful climate.
The interactive charts below will allow you to analyse the different average data that make the Algarve weather.
Taking care in the Sun
As can be observed, during Summer, the temperature in the Algarve is very high (it can go over 40ºC/100ºF exceptionally) and the periods of sun are long. It is common knowledge that excess sun can cause illnesses such as skin cancer.
The safest procedure is to use plenty of high-factor sunscreen, especially on children. A hat is an indispensable accessory, as are a good pair of sunglasses. It is advisable to avoid exposure to the sun during its strongest point in the day, between midday and 3 o'clock in the afternoon. In the case of sunburns or sunstroke, do seek medical attention.

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