People in Bilbao in northwestern Spain normally spend April dodging the showers but on Saturday many hit the beach as temperatures were up to 10 degrees Celsius (50 degrees Fahrenheit) above normal.
The Portuguese were also hitting the beach near Lisbon as temperatures rose to as high as 29 C.
Many people swapped umbrellas for ice creams as temperatures reached 21 C in Bilbao and were expected to hit 27 C elsewhere on Sunday, Aemet, the state weather forecasting agency said.
Temperatures more often experienced in summer months were being recorded in April, Aemet said.
In Portugal, temperatures were also higher than usual for this time of the year, according to weather agency IPMA on Saturday.
