Key West Weather in September

Averages By Month

September Overview

September in Key West is clearly the wettest month in the whole year. With around sixteen rainy days, you will experience showers probably every second day. Like in August, the sun shines around ten hours per day on average. Coupled with air temperatures reaching between 79°F (26°C) and 89°F (32°C) as well as water temperature of about 86°F (30°C), you can spend your time nicely lying on the beach. However, you should watch out for heavy downpours and hurricanes, having the highest chances to occur at the end of summer.

September is the month of women in Key West: Annually taking place, the Key West Womenfest is a five day celebration for women. With a wide range of festive activities, like pool parties, women-themed events, and nightly gatherings, you will experience the open-minded atmosphere typical for Key West. If you cannot get enough of partying, you should definitely plan to take part in the Key West BrewFest, where fans of beers and ales can get a taste of 150 different and exotic types. Additional events include brew-focused dinners, pool parties, and brew brunches - the perfect adventure for beer lovers!

High and Low Temperature in September °F

Water Temperature in September °F

Current Weather Key West

79°F clear sky
Local Time

Hourly 10 Days

Averages Key West

  J F M A M J J A S O N D

High °F

76° 77° 80° 83° 86° 89° 90° 91° 89° 86° 81° 78°

Low °F

66° 67° 69° 73° 76° 79° 81° 81° 79° 77° 72° 68°


8 9 10 11 11 11 11 10 9 8 8 8

Rain days

7 5 5 5 8 11 12 15 16 12 6 6

Water °F

71° 71° 73° 78° 81° 83° 86° 87° 86° 83° 78° 75°

Key West Weather by Month

Best Time to Visit Key West

As the area of Key West is characterized by traits of tropical climates, air and water temperatures remain typically warm throughout the whole year. However, the amount of rainfall shows significant monthly variations: From May through October, rainy days are very common with an average temperature of 84°F (29°C). This is the wet season. In the dry season however, days only have minimal rain but a lot of sunny and dry weather. The average temperature is slightly less than in the wet season at  74°F (23°C). Yet the range of monthly temperature averages only amounts to 15°F (8°C), implying that there are hardly any variations in temperature throughout the year. Taking the hurricane season into account as well, which occurs from June to November, the best time to pay a visit to Key West is from December to April. Accordingly, Key West has its highest visitor count in the months of December and January. During fall however, the numbers of visitors are at a minimum.

Days in Key West during the wet season (May through October) are characterized by rain and humidity. Heavy showers, especially during morning time, shortly followed by strong sunlight are typical. Precipitation reaches a peak in August through October being additionally affected by hurricanes and tropical thunderstorms at times. Visiting Key West during these months, rapidly changing weather conditions have to be expected.

Dry season (November through April) brings a lot of sunny days with low precipitation levels to Key West. Due to the dry climate, the average precipitation amounts to only 40 mm per year, causing Key West to be the driest place within Florida. While low rainfall is favorable for visits, the temperature at this time of the year can be somewhat cooler than in summer.

Due to changeable weather situations, it is highly recommended to keep an eye on local weather reports during your journey in Key West particularly to avoid major storms during hurricane season.

Things to know about Key West

Key West Location

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