COVID-19 (Coronavirus) may impact your travel plans and the data on our site. Stay safe, and always check official travel advice before you book.

Best time to visit Key Largo, FL, USA

Our verdict

The best time to visit Key Largo is September

Key Largo can be visited year-round, but based on the ideal climate conditions, cost of travel, and avoiding peak holiday periods, September is the best time to go.

The warmest month of the year in Key Largo is August, where the average temperature gets to around 30℃ (86℉), but temperatures can reach as high as 30℃ (87℉) on the hottest days in summer. The weather at night in the winter can get down to temperatures as low as 17℃ (62℉).

The days are longest in Key Largo in July, so if you want to see the sights during the day when the sun is up for the longest time, it’s best to visit around that time of year. On average it rains the most days in August, making it the wettest month of the year. Although it’s the wet season, it can often rain a little bit during the day or evening but have fine weather for a majority of the day too, so don’t let this put you off.

To learn everything you need to know (and none of the stuff you don’t) about when to visit Key Largo, keep reading below. Plus, you’ll find tools to help you get the best deals on travel and hotels too!

Warmest month

August

Least rainfall

March

Most daylight

July

Key Largo seasons

Before you continue, it’s important to know when the seasons are in Key Largo as they might be different to yours depending on where in the world you’re travelling from. Key Largo is in the Northern Hemisphere, so the seasons fall during these months:

SeasonMonths
Summer June to August
Autumn/fall September to November
Winter December to February
Spring March to May

Average temperatures in Key Largo

If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Key Largo for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.

Key Largo climate by month

If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Key Largo for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.

Jump to:

JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC

Key Largo in January

  • Average temperature: 21℃ (71℉)
  • Average high temperature: 23℃ (73℉)
  • Average low temperature: 20℃ (67℉)
  • Average humidity: 75%
  • Average sunny days: 17 days
  • Average rainfall: 19mm (1") over 11 days
17 days
of pure sunshine
11 days
of showers or rain

What to pack: If you’re heading to Key Largo in January, make sure you pack a light jumper or hoodie for the evenings and some light clothes for the daytime.


Key Largo in February

  • Average temperature: 22℃ (72℉)
  • Average high temperature: 23℃ (74℉)
  • Average low temperature: 21℃ (69℉)
  • Average humidity: 76%
  • Average sunny days: 15 days
  • Average rainfall: 23mm (1") over 10 days
15 days
of pure sunshine
10 days
of showers or rain

What to pack: If you’re heading to Key Largo in February, make sure you pack t-shirts and light clothing.


Key Largo in March

  • Average temperature: 23℃ (73℉)
  • Average high temperature: 24℃ (74℉)
  • Average low temperature: 21℃ (70℉)
  • Average humidity: 73%
  • Average sunny days: 17 days
  • Average rainfall: 15mm (1") over 11 days
17 days
of pure sunshine
11 days
of showers or rain

What to pack: If you’re heading to Key Largo in March, make sure you pack t-shirts and light clothing.


Key Largo in April

  • Average temperature: 25℃ (77℉)
  • Average high temperature: 26℃ (78℉)
  • Average low temperature: 24℃ (75℉)
  • Average humidity: 75%
  • Average sunny days: 14 days
  • Average rainfall: 32mm (1") over 13 days
14 days
of pure sunshine
13 days
of showers or rain

What to pack: If you’re heading to Key Largo in April, make sure you pack t-shirts and light clothing.


Key Largo in May

  • Average temperature: 26℃ (79℉)
  • Average high temperature: 27℃ (81℉)
  • Average low temperature: 26℃ (78℉)
  • Average humidity: 75%
  • Average sunny days: 13 days
  • Average rainfall: 67mm (3") over 15 days
13 days
of pure sunshine
15 days
of showers or rain

What to pack: If you’re heading to Key Largo in May, make sure you pack t-shirts and light clothing.


Key Largo in June

  • Average temperature: 28℃ (83℉)
  • Average high temperature: 29℃ (84℉)
  • Average low temperature: 27℃ (81℉)
  • Average humidity: 76%
  • Average sunny days: 9 days
  • Average rainfall: 80mm (3") over 19 days
9 days
of pure sunshine
19 days
of showers or rain

What to pack: If you’re heading to Key Largo in June, make sure you pack t-shirts and light clothing.


Key Largo in July

  • Average temperature: 29℃ (84℉)
  • Average high temperature: 30℃ (85℉)
  • Average low temperature: 28℃ (83℉)
  • Average humidity: 74%
  • Average sunny days: 9 days
  • Average rainfall: 88mm (3") over 20 days
9 days
of pure sunshine
20 days
of showers or rain

What to pack: If you’re heading to Key Largo in July, make sure you pack t-shirts and light clothing.


Key Largo in August

  • Average temperature: 29℃ (85℉)
  • Average high temperature: 30℃ (86℉)
  • Average low temperature: 28℃ (83℉)
  • Average humidity: 74%
  • Average sunny days: 8 days
  • Average rainfall: 113mm (4") over 20 days
8 days
of pure sunshine
20 days
of showers or rain

What to pack: If you’re heading to Key Largo in August, make sure you pack t-shirts and light clothing.


Key Largo in September

  • Average temperature: 29℃ (83℉)
  • Average high temperature: 29℃ (85℉)
  • Average low temperature: 28℃ (82℉)
  • Average humidity: 74%
  • Average sunny days: 5 days
  • Average rainfall: 108mm (4") over 23 days
5 days
of pure sunshine
23 days
of showers or rain

What to pack: If you’re heading to Key Largo in September, make sure you pack t-shirts and light clothing.

Key Largo in October

  • Average temperature: 27℃ (81℉)
  • Average high temperature: 28℃ (82℉)
  • Average low temperature: 26℃ (79℉)
  • Average humidity: 75%
  • Average sunny days: 9 days
  • Average rainfall: 81mm (3") over 18 days
9 days
of pure sunshine
18 days
of showers or rain

What to pack: If you’re heading to Key Largo in October, make sure you pack t-shirts and light clothing.


Key Largo in November

  • Average temperature: 25℃ (76℉)
  • Average high temperature: 25℃ (78℉)
  • Average low temperature: 23℃ (74℉)
  • Average humidity: 74%
  • Average sunny days: 12 days
  • Average rainfall: 31mm (1") over 14 days
12 days
of pure sunshine
14 days
of showers or rain

What to pack: If you’re heading to Key Largo in November, make sure you pack t-shirts and light clothing.


Key Largo in December

  • Average temperature: 23℃ (74℉)
  • Average high temperature: 24℃ (75℉)
  • Average low temperature: 22℃ (71℉)
  • Average humidity: 76%
  • Average sunny days: 15 days
  • Average rainfall: 23mm (1") over 12 days
15 days
of pure sunshine
12 days
of showers or rain

What to pack: If you’re heading to Key Largo in December, make sure you pack t-shirts and light clothing.


Top FAQs

The hottest month of the year in Key Largo is usually August, where temperatures tend to rise to around 30℃ (86℉) in the middle of the day or early afternoon.
The month with the least amount of rain in Key Largo is generally around March. The dry season often coincides with cooler weather, so you should check the temperatures in March first to make sure it’s still a good time to go.
The rainiest time of year in Key Largo is generally around August, although the wetter season can sometimes extend a few months either side of August too.
If you want to get the most out of your time visiting Key Largo, or if you're just afraid of the dark, the days in July are usually the longest between sunrise and sunset.

Key Largo map