So bad was the downpour that even one of Britain's latter-day druids -- fixtures of the annual celebration -- was forced to seek refuge with journalists in a tent set up near the entrance.
"It's a wash," said King Arthur Pendragon, his fine white beard turned into a soggy silver sponge. "Literally."
English Heritage put the crowd at the summer festival at 14,500, well below figures which typically hover around 20,000.
But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor.
"Everyone's very friendly," said Teresa Smith, 50, who spoke from underneath a rain-streaked plastic poncho. "Whether alcohol or drug-induced, everyone's very friendly."
Summer solstice -- the longest day of the year in the northern hemisphere -- has long drawn people to Stonehenge, a mysterious set of standing stones whose purpose remains a matter of conjecture.
The ancient stone circle on the Salisbury Plain about 80 miles southwest of London, was built in three phases between 3000 B.C. and 1600 B.C. It is one of Britain's most popular tourist attractions with over 850,000 visitors a year.
Each of the revelers Thursday marked the occasion in their own way, with some pressing their heads against the stones in silent meditation and others shouting out pop tunes while swigging cheap booze.
"It's magic," said Sandy Kay, 37, whose dance troupe participated in the night's opening ceremony. "It's one of the few times of the year you can go up and touch the stones."
The climax of the ceremony, which took place at the pockmarked Heel Stone at the edge of Stonehenge, involved chants of "All hail the sun!" even though the sun was nowhere to be seen amid the thin gray-white fog that settled around the Stonehenge's muddy fields Thursday morning.
But when Pendragon, resplendent albeit damp in his red-and-white robes, asked whether the crowd had had a happy solstice, the answer was a resounding: "Yes!"
Solstice celebrations also take place in other countries, although many are deferred until the last weekend in June.
In Bolivia, thousands of indigenous Andean pilgrims marked their winter solstice Thursday at Incan and Aymara archaeological sites, the beginning of year 5520 on the Aymaran calendar.
The rituals celebrate the ancestral belief that the sun's arrival on the solstice infuses participants with energy.
President Evo Morales, himself an ethnic Aymara, had declared the day a national holiday.
At the ceremonies, shamans offer dried fruit, llama wool, candies and fruits to Mother Earth in hopes of good harvests and good fortune.
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