Marathon ties daily warm-low record as muggy weather persists
Marathon’s overnight low stayed stuck at 85 degrees, tying a daily record and leaving little relief for anyone trying to sleep or work through the heat.
Marathon’s overnight low fell only to 85 degrees on July 9 at Florida Keys Marathon International Airport, tying the city’s daily warm-low record. The reading left older residents, outdoor workers and anyone without reliable air-conditioning with little nighttime cooling after another muggy Keys day.
Marathon temperature records date back to 1951, and the July 9 data were preliminary and could still be revised after final quality control by the National Centers for Environmental Information.
A ridge axis stretching west across central and south Florida was helping drive gentle to moderate east-southeast breezes across the Keys, while a persistent Saharan Air Layer kept conditions warm, muggy and mostly dry. That setup held overnight lows in the lower to mid 80s and daytime highs near 90 degrees, with hazy skies and almost no rain chance.
By July 13, Marathon station observations showed 88 degrees with a dew point of 76 and a heat index of 99, a combination that can make even short stretches outside feel oppressive in Monroe County.
The Marathon record came just days after another warm-low mark in Key West. On June 29, the low at Key West International Airport reached 84 degrees, tying a daily warm-low record most recently set in 2024. Key West temperature records date back to 1872.
This article was produced by Prism’s automated news system from verified source data, official records, and press releases, then run through automated quality and moderation checks before publishing. The system is built and supervised by the people who set the standards it runs under. Read our full AI policy.
Did this article answer your question?
