Every year on Sept. 21, the date named in the first line of Earth, Wind & Fire's "September," listeners play the record heavily enough to move industry data. In 2018, the song sold 5,000 downloads on the 21st alone, a 788 percent jump over the day before, according to Billboard's tally of Nielsen Music data. This year the surge carried the song onto a chart it had not appeared on since the Carter administration.

"September" re-entered the Billboard Hot 100 at No. 45 on the chart dated Oct. 3, its first appearance since the chart dated March 10, 1979. In the tracking week of Sept. 18 through 24, it drew 6 million official U.S. streams, up 51 percent from the week before. Song sales rose 236 percent to 3,000, and radio audience climbed 137 percent to 3.3 million, according to Luminate figures published by Billboard. The original run in 1978 and 1979 lasted 17 weeks, so the Oct. 3 chart gives the song its 18th week on the Hot 100.

Earth, Wind & Fire had not placed any song on the Hot 100 since "Sunday Morning" in 1993. With "September" back, the band's career count stands at 33 Hot 100 entries, seven of them top 10s, and one No. 1, "Shining Star," which reached the summit in 1975.

This year the 21st fell on a Monday, four days into a tracking week that began Friday, Sept. 18. Working back from Luminate's percentages, the song drew roughly 4 million streams in the previous week, along with about 900 downloads and a radio audience near 1.4 million. Those totals left it off the chart dated Sept. 26.

Streams supplied most of the volume, while sales more than tripled and the radio audience more than doubled over the same seven days. On-demand listeners, download buyers and broadcast programmers all added chart points inside one week.

The route back onto the chart runs through Billboard's recurrent rule, which was rewritten a year ago. The new terms took effect on the chart dated Oct. 25, 2025, the first chart of Billboard's 2026 chart year. Descending songs now leave the Hot 100 below No. 50 after 20 weeks, below No. 25 after 26 weeks, below No. 10 after 52 weeks, or below No. 5 after 78 weeks. Billboard said the tiers were meant to clear out songs that had gone recurrent at radio or were no longer being worked by labels for streaming playlists. The change followed a stretch of record-length runs led by Teddy Swims' "Lose Control," which left the chart when the rules took effect.

The same announcement set terms for older records coming back. Holiday standards qualify to return to the Hot 100 above No. 50 no matter how many weeks they have already logged. Billboard extended that treatment to surging non-holiday catalog songs, while titles without meaningful chart history can enter at any position on a case-by-case review. "September" carried 17 prior weeks and a top 10 peak, and it landed five places inside the line.

A Winter Hit That Moved to Fall

The song's first chart life ran on a different calendar. The band recorded "September" in September 1978, and ARC and Columbia released it as a single on Nov. 18 of that year. It was one of two new tracks on the compilation The Best of Earth, Wind & Fire, Vol. 1. It reached No. 1 on Billboard's soul singles chart and peaked at No. 8 on the Hot 100 in February 1979.

Maurice White and Allee Willis wrote the song over a guitar figure from Al McKay, with White producing. Willis later said she objected to the nonsense syllables in the chorus until White talked her out of it. She described the lesson she took from him as "never let the lyric get in the way of the groove." The date in the opening line is the one piece of the lyric that points listeners to a specific day on the calendar.

For years the annual surge registered on charts below the Hot 100. In 2018, the week that opened on the 21st sent "September" onto Billboard's Digital Song Sales chart at No. 26 on 9,000 downloads. The same week it reached No. 1 on R&B Digital Song Sales for the first time. In September 2020, 42 years after its release, the song debuted at No. 4 on the Billboard LyricFind U.S. chart.

The RIAA certified "September" 6x Platinum on Sept. 17, 2020. Under the current formula, that certification counts on-demand streams alongside sales, as HitsCulture laid out in its breakdown of what a plaque actually measures. The City of Los Angeles has declared Sept. 21 Earth, Wind & Fire Day. 

Where Else the Week Registered

The Hot 100 return came with movement on several other charts. "September" jumped from No. 185 to No. 69 on the Billboard Global 200, and it debuted at No. 49 on the Billboard Canadian Hot 100, the song's first appearance on that chart. On R&B Streaming Songs it rose to No. 3, a new peak for the record. The same top 10 held SZA's "Snooze" at No. 6 and Prince and the Revolution's "Purple Rain" at No. 7.

Listeners who started with "September" kept going through the rest of the Earth, Wind & Fire catalog. "Let's Groove," the band's No. 3 Hot 100 hit from 1981, rose 13 percent to 2.6 million streams for the week. The 1998 Greatest Hits collection climbed 40 percent to 13,000 equivalent album units, enough to return it to the Top R&B Albums chart.

The band and its label have worked the date directly. In 2020, the group and Legacy Recordings issued a remix by Eric Kupper. On the 21st that year, DJ Spinna ran a three-hour virtual party on the band's YouTube channel, and principal members Philip Bailey, Verdine White and Ralph Johnson dropped in.

The next Hot 100 tracks activity from Sept. 25 through Oct. 1. That window covers the last days of the month in the song's title and does not include the date in its opening line. Sept. 21 falls on a Tuesday in 2027, which puts the date inside the tracking week of Sept. 17 through 23 and on the chart dated Oct. 2.