Key Largo Water Temperature

Surrounded by a crystal clear, warm ocean teeming with marine life, the island of Key Largo thoroughly deserves its reputation as ‘The Dive Capital of the World’.


This largest and northernmost of the Florida Keys boasts two state parks, a national park and a national marine sanctuary which was the first U.S. underwater park.
Key Largo is a town close to gulf of mexico. August is the month with the hottest water temperature at 86.4°F / 30.2°C. The coldest month is January with an ø water temperature of 74.1°F / 23.4°C. March is the month with the lowest precipitation of 0in / 0mm and September with the highest precipitation in a year with 5.5in / 140.1mm. The avg. air temperature is around 82.6°F / 28.1°C, August is the month with the highest temperature. January is the coolest with 68.2°F / 20.1°C average air temperature. March, April, May, June, September, October, November would be the best time to visit. tropical savanna climate with wet summer would be the climate here.

Key Largo Summary

Description Value
Current water temperature 80.6 °F / 27 °C
Warmest Month Water Temperature: August with 86.4°F / 30.2°C
Coldest Month Water Temperature: January with 74.1°F / 23.4°C
Warmest Month Air Temperature: August with 82.6°F / 28.1°C
Coldest Month Air Temperature: January with 68.2°F / 20.1°C
Wettest Month: September with 5.5in / 140.1mm
Driest Month: March with 0in / 0mm
Highest Humidity September with 79.5%
Lowest Humidity April with 67.3%
Best Time to Visit: March, April, May, June, September, October, November
Climate Classification tropical savanna climate with wet summer

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August is the month with the warmest water temperature at 86.4°F / 30.2°C. The month with the coldest is January with an average water temperature of 74.1°F / 23.4°C.

Due to the tropical climate it enjoys all year round, Key Largo is a comfortably warm place to visit any time of the year. The average summer temperature is 89 degrees, but this is made comfortable by cooling ocean waters. In the winter temperatures hover around 75 to 80 degrees, with occasional warmer days.

The island is accessible by two roads. After flying in from Miami International Airport you can be on Key Largo in less than an hour by car or shuttle bus. A Greyhound service is also available.


Key Largo Weather Forecast for the next 14 Days

Date Weather High Temp. Low Temp. Rain? Windspeed Precipitation Humidity
Dec 05.
Partly Cloudy
66 °F
19 °C
55 °F
13 °C
0 %
16.2 mph
26 km/h
0 inch
0 mm
60%
Dec 06.
Patchy rain nearby
68 °F
20 °C
54 °F
12 °C
89 %
11.8 mph
19 km/h
0 inch
0.2 mm
64%
Dec 07.
Partly Cloudy
70 °F
21 °C
61 °F
16 °C
0 %
17.4 mph
28 km/h
0 inch
0 mm
63%
Dec 08.
Partly Cloudy
73 °F
23 °C
57 °F
14 °C
0 %
18 mph
29 km/h
0 inch
0 mm
63%
Dec 09.
Partly Cloudy
68 °F
20 °C
50 °F
10 °C
0 %
17.4 mph
28 km/h
0 inch
0 mm
51%
Dec 10.
Overcast
66 °F
19 °C
63 °F
17 °C
0 %
19.9 mph
32 km/h
0 inch
0 mm
72%
Dec 11.
Partly Cloudy
70 °F
21 °C
59 °F
15 °C
0 %
11.2 mph
18 km/h
0 inch
0 mm
64%
Date Weather High Temp. Low Temp. Rain? Windspeed Precipitation Humidity
Dec 12.
Partly Cloudy
70 °F
21 °C
57 °F
14 °C
0 %
11.2 mph
18 km/h
0 inch
0.1 mm
66%
Dec 13.
Patchy rain nearby
75 °F
24 °C
57 °F
14 °C
87 %
19.9 mph
32 km/h
0 inch
0.5 mm
73%
Dec 14.
Patchy rain nearby
75 °F
24 °C
61 °F
16 °C
87 %
18.6 mph
30 km/h
0.1 inch
2.1 mm
83%
Dec 15.
Partly Cloudy
75 °F
24 °C
72 °F
22 °C
0 %
10.6 mph
17 km/h
0 inch
0 mm
69%
Dec 16.
Patchy rain nearby
77 °F
25 °C
57 °F
14 °C
81 %
29.8 mph
48 km/h
0.1 inch
1.6 mm
76%
Dec 17.
Partly Cloudy
72 °F
22 °C
68 °F
20 °C
0 %
21.7 mph
35 km/h
0 inch
0 mm
68%
Dec 18.
Partly Cloudy
70 °F
21 °C
57 °F
14 °C
0 %
22.4 mph
36 km/h
0 inch
0 mm
70%

Key Largo weather by month / climate table

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

77.4 68.2 60.3 0.1 0 70.4%

February

78.6 70.2 61.5 0.2 0 71.3%

March

79.9 72.1 64 0 0 67.6%

April

83.1 75.4 67.8 0 0 67.3%

May

84.9 78.4 71.6 1.5 1 70.6%

June

86.7 81.1 75.7 5.4 20 77.4%

July

87.8 82.2 77.5 4.2 20 77%

August

88.2 82.6 78.4 5.5 22 77.5%

September

87.1 81.1 76.8 5.5 22 79.5%

October

85.1 78.6 71.8 2.2 0 75.6%

November

82 73.8 65.7 0.5 0 71%

December

78.4 71.2 64.2 0.3 0 73%

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

25.2 20.1 15.7 2 0 70.4%

February

25.9 21.2 16.4 4.2 0 71.3%

March

26.6 22.3 17.8 0 0 67.6%

April

28.4 24.1 19.9 1 0 67.3%

May

29.4 25.8 22 38.1 1 70.6%

June

30.4 27.3 24.3 136.6 20 77.4%

July

31 27.9 25.3 105.7 20 77%

August

31.2 28.1 25.8 139 22 77.5%

September

30.6 27.3 24.9 140.1 22 79.5%

October

29.5 25.9 22.1 56.1 0 75.6%

November

27.8 23.2 18.7 12.9 0 71%

December

25.8 21.8 17.9 8.8 0 73%
March is the driest at 0in / 0mm and September the wettest month with 5.5in / 140.1mm. With an average temperature of 82.6°F / 28.1°C, August is the warmest month in a year. January is the coldest with 68.2°F / 20.1°C average temperature.

Best time to Visit Key Largo

With the Key Largo water temperature ranging from 69 degrees in January up to 87 degrees in July and August, it is ideal for swimming throughout the year, and with a wide range of ocean-going activities on offer including scuba-diving, snorkeling, sports fishing and boating, there is plenty to do.

The ocean to the east of Key Largo is a treasure trove of living coral formations, exotically beautiful fish and fascinating shipwrecks just waiting to be explored.

Just remember to check the local weather forecast before venturing out, don’t touch the delicate coral, and don’t feed the fish, otherwise this warm water wonderland is your oyster.

Activities & POI in Key Largo

Type of Activity List
Beach North Beach, South Beach
Attraction The Laura Quinn Wild Bird Sanctuary
Caravan Site King's Kamp RV Park, Key Largo Kampground

Picture Copyright: Flickr CC 2.0 Allie_Caulfield

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