It happened at the Autumn Woods Apartments in Conroe.
Firefighters say they received a call around 10 p.m. It was a two-alarm fire.
Firefighters say it took about an hour-and-a-half to get the fire under control.
An entire building suffered damaged. There are 16 units in the building, 8 were heavily damaged.
Residents describe hearing loud thunder when it happened.
"Flames were shooting up about 50 feet in the air," said Ken Bufkin, a resident.
The American Red Cross is assisting the 41 one residents that were impacted by the fire.
This marks the second apartment fire in a week in Montgomery County where lightning was a suspected cause.