Typical September weather
Key West
Florida · September
89° days
79° nights
about 10 rainy days · 12½ hours of daylight · ocean 88°
What to pack
- Umbrella
- Swimsuit
- Sunscreen
What September feels like
September is the sharp end of hurricane season and everyone here knows the drill — there is exactly one road off this island, and it fills fast when a storm gets called. Restaurants take their annual break; the ones that stay open are full of year-rounders.
Rain arrives about 10 days of the month, so keep one flexible day in your plans. Full tropical humidity: mornings are your friend, and shade is currency. about 10 afternoons top 90°.
Can you swim?
The ocean runs about 88° — bath-warm.
The numbers
| Typical high | 89° |
|---|---|
| Typical low | 79° |
| Days with real rain | 10 |
| Total rain | 7.2 in |
| Humidity | tropical |
| Water temperature | 88° |
| Sunrise / sunset (mid-month) | 7:13 am / 7:31 pm |