Climate Insights for Key Largo

The climate in Key Largo is hot. The average annual temperature is 26°C and approximately 951mm of precipitation falls per year. Key Largo receives a notable amount of rainfall throughout the year, including during its driest month. Key Largo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, March, when temperatures can drop to 21°C.

Key Largo has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 21°C and an average of 22°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.

Key Largo is a moderately rainy area, receiving approximately 951mm of precipitation annually, which averages out to around 79mm per month. The wettest month is September, averaging 137mm of rainfall. October and June also tend to see above-average precipitation. The driest month is February, with just 32mm. That's 105mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Key Largo is moderately windy, with an average annual wind speed of 26km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 30km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 22km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 8km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 29km/h in winter, 27km/h in spring, 22km/h in summer, 26km/h in autumn.

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It is currently spring in Key Largo, which began on March 20, 2026. Key Largo 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 August at around 29°C, while the coldest stretch bottoms out in January near 21°C. Summer is next, beginning on June 21, 2026 — 49 days from now.

The best time to visit Key Largo is during January, February, March, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 48mm per month. By contrast, August can be uncomfortably hot with temperatures reaching 29°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Key Largo 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.