Ogier and returning co-driver Julien Ingrassia won three of the morning’s four forest stages before successfully navigating torrential rain, standing water and severely reduced visibility during a challenging afternoon loop around Jyväskylä.

Evans climbed from fifth to second as the conditions reshaped the standings, while home driver Sami Pajari completed an all-Toyota Gazoo Racing overnight top three, 26.7 seconds behind Ogier.

Ogier began Friday 1.2 seconds behind overnight leader Adrien Fourmaux but moved into the lead with the fastest time through Laukaa. Further stage wins on Sydänmaa and Hoho enabled him to reach midday service 5.3 seconds ahead of Fourmaux, with Pajari a further 2.7 seconds behind.

The afternoon initially appeared set to produce a close three-way contest. Pajari won the second pass through Laukaa to reduce Ogier’s advantage to 5.4 seconds, before heavy rain transformed conditions on Saarikas.

Running first on the road, Evans avoided the worst of the downpour and set the fastest time. Conditions deteriorated significantly for the crews behind, with Fourmaux losing almost 90 seconds and Oliver Solberg conceding 55.6 seconds as water entered his Toyota.

Ogier limited his time loss to 6.5 seconds and, crucially, conceded only 2.1 seconds to Pajari.

“Bad luck, but that is the way it is with the weather,” Ogier said. “Compared to Sami, we did a good job.”

Further difficulties followed on Sydänmaa, where Ogier recovered from a slide into a ditch but was still 30.2 seconds faster than Pajari. The Finn was hampered by a misted windscreen after the blower in his car stopped working.

Ogier maintained his advantage through the remaining forest stage and Friday evening’s Harju super special, completing a day in which he combined strong pace with a measured approach in difficult conditions.

“It’s been a very good day,” he said. “It was very tricky this afternoon and probably not so enjoyable for anybody, but it’s good that we managed to come out of it.”

Evans’ second place represented a strong recovery from a challenging road position. The Welshman opened the road throughout the day and briefly left the road on the first pass through Hoho, but took advantage of the changing conditions to move ahead of Pajari.

“The morning wasn’t bad from our side, but the afternoon was a bit of a lottery,” Evans said. “We had it better on the second stage of the loop, but then probably had the worst of it on the next. I’m happy to get through it.”

Pajari remained firmly in contention for a podium finish but acknowledged that the time lost on Sydänmaa had significantly reduced his chances of challenging for victory.

“We lost the game for the win on that one stage,” he said. “The blower wasn’t working and we didn’t realise it, so we had full mist on the windscreen. It’s a big shame, but we are still fighting for the podium.”

Solberg ended the day fourth, 41.3 seconds behind the leader. He is 14.6 seconds behind Pajari and holds a 23.6-second advantage over Mārtiņš Sesks, who emerged from the difficult afternoon as the highest-placed M-Sport Ford driver in fifth.

Fourmaux dropped from second to sixth after encountering the heaviest rain, while Josh McErlean reached the overnight halt in seventh despite also struggling with a heavily misted windscreen.

Takamoto Katsuta completed the day in eighth after what he described as a “disaster day”, narrowly ahead of Thierry Neuville. The Belgian lost almost three minutes after striking a concealed rock and damaging the front-left suspension of his Hyundai during the morning pass through Hoho.

Esapekka Lappi and Jon Armstrong were the major retirements of the day. Lappi will not restart after his Hyundai sustained roll cage damage in an accident on Sydänmaa, while Armstrong’s Ford Puma Rally1 became stranded in a ditch on Saarikas.

Saturday’s itinerary features two passes through Parkola, Päijälä, Västilä and Leustu, comprising 123.3 competitive kilometres.