Spain officially entered summer today, Sunday 21 June, with the arrival of the 2026 summer solstice at 09:24 Spanish mainland time.
The astronomical event marks the longest day of the year in the Northern Hemisphere and signals the official start of summer. For residents and visitors across the Costa Blanca, the timing could hardly be more fitting.
After all, Alicante is already celebrating Hogueras de San Juan, a festival deeply rooted in ancient midsummer traditions that honour fire, light and the arrival of the new season.
Why the summer solstice happens
The solstice occurs when the Earth’s northern hemisphere tilts most directly towards the Sun. As a result, the Northern Hemisphere enjoys its greatest number of daylight hours of the year.
However, the longest day does not usually bring the highest temperatures. Instead, the hottest weather typically arrives later because land and sea continue absorbing heat throughout the summer. Meteorologists refer to this phenomenon as seasonal lag.
Long days on the Costa Blanca
In Alicante, the solstice arrived at 10:24 local summer time (CEST), giving the city one of its longest daylight periods of the year.
Interestingly, the earliest sunrises occurred around a week ago. Meanwhile, the latest sunsets will not arrive until the end of June.
Consequently, residents can continue enjoying long evenings even though the solstice itself has already passed.
Summer begins before San Juan
Many people associate the start of summer with the Night of San Juan on 23 June. In reality, summer began today from an astronomical perspective.
Nevertheless, the San Juan celebrations remain closely linked to the solstice because they traditionally mark the arrival of longer days, warmer weather and the height of the light-filled season.
The 2026 summer season will continue for approximately 93 days and 16 hours.
Afterwards, autumn will begin on 23 September, bringing shorter days and cooler conditions.
A hot start to the season
This year, the arrival of summer coincides with forecasts of an intense early-season heat spell across much of Spain.
As temperatures climb across large parts of the country, the longest day of the year is likely to feel every bit like midsummer.
For that reason, many may experience the first days of astronomical summer under some of the hottest conditions seen so far this year.
