The surprising rise of KFI-AM (640) to the top spot in local ratings wasn’t just a one-time fluke.

The news talk station retained its hold on the No. 1 spot in September’s L.A. radio ratings with a 5 percent listener share, according to data released Wednesday by Arbitron Inc. Top 40 music powerhouse KIIS-FM (102.7), which had been the top-rated station in L.A. before August, was second with a 4.8 percent listener share.

Classic hits station KRTH-FM (101.1) claimed third place with a 4.7 percent listener share, while adult contemporary station KOST-FM (103.5) was fourth with 4.1 percent. The two stations had tied for third place in the August ratings.

Hip hop station KPWR-FM (105.9) was fifth place with 3.9 percent.

KFWB-AM (980), which flipped formats last month from a strictly news station to news talk, actually slid down in the ratings from 27th place in August to a four-way tie for 34th place in September. KFWB had a 0.8 listener share last month.