A local FM radio staion is easily picked up in evenings, but has interference in!

A local FM radio staion is easily picked up in evenings, but has interference in the morning. Any answers?

I listen to a local FM radio station in my car while commuting. In the afternoon, it typically comes through clearly. In the mornings, it is typically filled with static and other stations (more distant) breaking through. Is this atmospheric conditions at work, as in AM stations?

The sun really does not have much to do with local radio stations transmissions. Sun-spot interference usually causes problems for satellite delivered items only.

So, if the morning program is syndicated, the sun could be the culprit, because the show would be delivered via satellite to the station for re-broadcast.

But, if the show is live, and local, the stations transmitter could be the problem. A few years ago, I worked for a radio station that kind of had the same problem. As it turned out, our transmitter was not located at the actual broadcast building, it was located about 5 miles away. The air-conditioner at the transmitter building broke down, and the transmitter was overheating around the same time each day. This went on for a while before the freaking "suits" had the engineer go out and fix the A.C. (You gotta love small market radio)
After the A.C. was fixed, the transmitter did not overheat, and all was fine again.
I'm not saying that this is whats happening to your station, but there is an outside chance that it can be something similar.