The actor, who played Peter in the latest big-screen adaptations of CS Lewis's book series, suffered the "very traumatic" accident while filming drama The Silent Mountain in a building on an Italian mountaintop.
Taking to Twitter after the freak event, Moseley reassured fans: "I was struck by lightning on the arm and am doing fine now. It was very traumatic.
"It came through the roof and struck nine other crew members. I feel very lucky to be alive. I've learnt a lot from this experience."
He added: "I am looking forward to all of you seeing the film. I believe it will be very special. Thank you for all of you kind words."
Moseley appears to have got straight back to filming, tweeting the above picture of himself from the Silent Mountain shoot hours later.
Watch the trailer for Moseley's The Chronicles of Narnia - The Voyage of the Dawn Treader below: