Climate Overview
The climate in Key West is hot. The average annual temperature is 25°C and approximately 896mm of precipitation falls per year. January is the wettest month, receiving around 183mm of rainfall. Key West is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are February, January, March, when temperatures can drop to 20°C.
Temperature
Key West has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 29°C. February is the coolest month, with minimum temperatures around 20°C and an average of 21°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between February and March, with a 3°C shift in average temperatures.
Precipitation
Key West is a moderately rainy area, receiving approximately 896mm of precipitation annually, which averages out to around 75mm per month. The wettest month is January, averaging 183mm of rainfall. August and May also tend to see above-average precipitation. The driest month is December, with just 25mm. That's 158mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Key West is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.
Seasons
51 days until Autumn
It is currently summer in Key West, which began on June 21, 2026. Key West is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 29°C, while the coldest stretch bottoms out in February near 20°C. Autumn is next, beginning on September 23, 2026 — 51 days from now.
Spring
Temperatures range from 23 to 27°C. Precipitation is moderate at around 178mm for the season, averaging 59mm per month. Winds are generally light, averaging 5km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 27 to 29°C. Precipitation is moderate at around 280mm for the season, averaging 93mm per month. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 29°C. Precipitation is moderate at around 204mm for the season, averaging 68mm per month. Winds are generally light, averaging 6km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 20 to 25°C. Precipitation is moderate at around 234mm for the season, averaging 78mm per month. Winds are generally light, averaging 7km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Key West is during February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 29mm per month. By contrast, July can be uncomfortably hot with temperatures reaching 29°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Key West based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
