If you plan to visit Key West in August, the weather is typically alright, with an average high temperature of +86°F during the day and approximately 3 sunny days. Expect some rainy, though, as there are typically 18 rainy days in the month and around 129 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+86°F
Avg. max. temperature
+73°F
Min.
+95°F
Max.
129 mm
Total precipitation
75%
Avg. humidity
3 m/s
Avg. wind
3 ☀️
Sunny Days
3 ⛅️
Cloudy
18 🌦
Rainy
Our opinion: Key West has OK weather in August.
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Average temperature in Key West in August
Here are the expected maximum, average and minimum temperatures in Key West for August based on the historical data.
Last Year
Historical Data
Going from a maximum of +93°F during the day to a minimum of +79°F during the night, the temperature in August averages around +91°F.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +93°F to +90°F.
Is Key West warm or cold in August?
Key West is typically warm in August.
Maximum temperatures go up compared to the previous month from +86°F to +86°F. The minimum temperature also goes up from +81°F to +81°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in Key West, here is the comparison with other months:
Climate in Key West in August
Key West weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+86°F
+86°F
+86°F
Min. temperature
+73°F
+73°F
+73°F
Max. temperature
+95°F
+95°F
+100°F
Rainfall
96 mm
129 mm
173 mm
Wind
3 m/s
3 m/s
3 m/s
Humidity
74%
75%
76%
Air pressure
1016 HPa
1015 HPa
1013 HPa
Sunny days
4
3
2
Cloudy days
4
3
2
Rainy days
15
18
21
Snowy days
0
0
0
August typically has worse weather conditions compared to July.The temperature levels stay the same in the area of +86°F for average maximum temperature during the day.Prepare for more rain. Average rainfall goes from 96 mm to 129 mm.Humidity rises from 74% to 75%.The average wind speed doesn’t change much during August, staying around 3 m/s.The days becoming less sunny, going from 4 sunny days in July to 3 in August.
September brings much the same weather, it remains ok.
Wind speed in Key West in August based on historical data.
Last Year
Historical Data
The average wind speed is 4 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Key West is gradually increasing during August, going from 3 m/s to 6 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in Key West based on historical data.
Last Year
Historical Data
Typically, there is a 68% chance of rain on an average day in August, with total rainfall of approximately 203 mm. The maximum amount of rainfall per day is around 40 mm, which is moderate rain.August is a pretty wet month with over 21 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
August is one of the rainiest months in Key West, here is a comparison with other months, total mm:
Key West wettest month is September, where a typical day has a 70% chance of precipitation and 173 mm of rainfall per day. February, on the other hand, is the driest month with a mere 32% chance of precipitation and 38 mm of rainfall per day.
How was the weather last August in Key West?
This is the weather in Key West in August 2024:
1 August
☀️
+93°F
2 August
☀️
+93°F
3 August
☁️
+90°F
4 August
☀️
+93°F
5 August
☀️
+93°F
6 August
☀️
+92°F
7 August
☀️
+93°F
8 August
☀️
+92°F
9 August
☀️
+92°F
10 August
☀️
+92°F
11 August
☀️
+92°F
12 August
☀️
+92°F
13 August
☀️
+92°F
14 August
☀️
+92°F
15 August
☀️
+91°F
16 August
🌧️
+88°F
17 August
☀️
+91°F
18 August
☀️
+91°F
19 August
🌧️
+92°F
20 August
🌧️
+87°F
21 August
☀️
+91°F
22 August
☀️
+91°F
23 August
☀️
+90°F
24 August
☀️
+89°F
25 August
☀️
+90°F
26 August
☀️
+91°F
27 August
☀️
+90°F
28 August
🌧️
+91°F
29 August
🌧️
+89°F
30 August
🌧️
+90°F
31 August
☀️
+90°F
In August 2024 Key West had 24 sunny days, 1 cloudy days, and 6 rainy days. The average maximum temperature was +91°F, with an absolute maximum of +93°F and a minimum of +88°F. The average humidity was 72%, with a maximum of 94% and a minimum of 52%. The average wind speed was 4 m/s, with a maximum of 13 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change Over the Years
This is how Key West climate has changed over the last 43 years.
The climate in Key West in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1981 (+77°F) and the highest in 2019 (+85°F). The driest year was 2009 with only 624 mm of rainfall, and the wettest year was 2024 with 1925 mm.
FAQ
Frequently asked questions about the weather in Key West in August:
Is August a good time to visit Key West?
It’s always a good time to visit Key West, but the weather is changeable in August, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Key West in August?
August is warm in Key West. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Key West rainy in August?
Key West is often rainy in August. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Key West in August?
Usually, it’s not very sunny in Key West in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Key West, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
