Those taking part enjoyed a dry walk to 'the Field' on Moneymore Road after arriving on buses at Castledawson Road.
But the thunder clouds eventually opened and the rain came down before drying up for the return procession through the town.
Eight Districts were on parade - Ballyronan, Castledawson, Garvagh, Kilrea, Moneymore, Tamlaght O’Crilly, Tobermore and the host District Magherafelt.
About 50 bands and lodges took part and spectators enjoyed a great spectacle of music and sights.
21. On parade
Lisnagrot Accordion Band on the march in Magherafelt. Credit: National World Photo: National World
22. On parade
One of the bands which took part in the Twelfth procession in Magherafelt. Credit: National World Photo: National World
23. On parade
It was a tough climb up Broad Street for these banner carriers. Credit: National World Photo: National World
24. On parade
Boveedy Band taking part in today's Twelfth demonstration in Magherafelt. Credit: National World Photo: National World