September’s Hurricane History - 2025
Bottom Line: The calendar tells us that we're halfway through hurricane season. The calendar and the timing of tropical systems are two different animals, however. At the midway point of hurricane season, we can once again take solace in South Florida having successfully navigated the first three months of hurricane season free from the impact of hurricanes.
Notably, despite reports of what was expected to be a well above average season, the first half of this year’s hurricane season has only been about average. Entering September last year, we had three hurricanes already develop, this year it’s been only one that never made landfall. Two years ago, there had already been 11 named storms compared to six this year. Hopefully the trends remain in our favor we’re now into the peak two weeks of hurricane season historically.
The National Hurricane Center is tracking a disturbance, off the coast of Africa, otherwise it’s quiet. Ordinarily Saharan dust, which inhibits tropical development, abates during the first half of August. This year’s level of dust has continued into September acting as a mitigating factor thus far.
As for September’s hurricane history – it’s notable for two reasons. It's the most active month of hurricane season and the historical peak day of hurricane season is September 10th. Here’s a look at how much of the season is really left by using historical storm activity as a guide.
Since tracking of the Atlantic Hurricane season began in 1851:
- 36% of all tropical storms have formed during September
- 40% of all hurricanes have formed during the month
On average 3.6 tropical storms and 2.5 hurricanes have formed in September. Statistically the calendar says we’re halfway through hurricane season. In terms of historical storm development, if this season is consistent with historical norms, most of the season is ahead of us. Entering September here's what history has shown.
- 33% of hurricanes
- 37% of tropical storms
In other words, close to two-thirds of activity happens from this point forward. In happier news, once we cross the mid-point of September, the odds shift the other way quickly. Fingers crossed...