The climate you´ll find in Lagos is the typical climate of the Algarve. A mixture between Atlantic and the Mediterrenean, meaning that there are no extreme temperatures, always nice weather, warm summers and humidity.

Summers in the Algarve tend to be dry, but not extreme. Winters are a little humid but nice as well.
The rainy season happens during the months of November and December, and the coldest months are January and February. June and July are the warmest months.