Marathon Water Temperature

Marathon is a town close to Gulf of Mexico. August is the month with the warmest water temperature at 86.7°F / 30.4°C. The coolest month is January with an avg. water temperature of 73.4°F / 23°C. January is the sunniest at 0in / 0mm and September the wettest month with 6.2in / 158.5mm. The average air temperature is around 82.9°F / 28.3°C, August is the hottest month in a year. January is the coolest with 67.8°F / 19.9°C average air temperature. tropical savanna climate with wet summer would be the climate here. March, April, May, June, July, September, October, November would be the best time to visit.

Marathon Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: August with 86.7°F / 30.4°C
Coldest Month Water Temperature: January with 73.4°F / 23°C
Warmest Month Air Temperature: August with 82.9°F / 28.3°C
Coldest Month Air Temperature: January with 67.8°F / 19.9°C
Wettest Month: September with 6.2in / 158.5mm
Driest Month: January with 0in / 0mm
Highest Humidity September with 78.7%
Lowest Humidity April with 69.7%
Best Time to Visit: March, April, May, June, July, September, October, November
Climate Classification tropical savanna climate with wet summer

Marathon water temperature by month

Gulf of Mexico water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

75 73.6 72.5

February

74.8 73.8 72.9

March

76.5 75.4 73.9

April

79.5 77.9 76.5

May

82.6 81 79.2

June

85.5 84.4 82.8

July

86.7 85.8 85.1

August

86.9 86.5 85.8

September

86.2 85.5 84.2

October

84.4 82.6 80.2

November

80.2 78.4 76.8

December

76.8 75.7 74.5

Gulf of Mexico water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

23.9 23.1 22.5

February

23.8 23.2 22.7

March

24.7 24.1 23.3

April

26.4 25.5 24.7

May

28.1 27.2 26.2

June

29.7 29.1 28.2

July

30.4 29.9 29.5

August

30.5 30.3 29.9

September

30.1 29.7 29

October

29.1 28.1 26.8

November

26.8 25.8 24.9

December

24.9 24.3 23.6
August is the month with the warmest water temperature at 86.7°F / 30.4°C. The month with the coldest is January with an average water temperature of 73.4°F / 23°C.

Marathon weather by month / climate table

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

75 67.8 61.7 0 0 72.9%

February

75.7 69.6 63 0.1 0 74.9%

March

77.5 71.8 65.7 0.1 0 70.5%

April

80.8 75.4 70 0 0 69.7%

May

83.5 78.6 73.4 1.5 1 71.7%

June

85.3 81.5 77.5 5.8 16 77%

July

86.2 82.6 79.2 4.2 12 76.5%

August

86.7 82.9 79.7 6.2 18 76.9%

September

85.5 81.5 77.9 6.1 19 78.7%

October

83.8 78.8 73 1.9 0 75.2%

November

80.4 73.9 67.1 0.2 0 72.4%

December

76.5 71.2 65.7 0.2 0 75.2%

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

23.9 19.9 16.5 0 0 72.9%

February

24.3 20.9 17.2 2.4 0 74.9%

March

25.3 22.1 18.7 1.9 0 70.5%

April

27.1 24.1 21.1 0 0 69.7%

May

28.6 25.9 23 38.1 1 71.7%

June

29.6 27.5 25.3 147 16 77%

July

30.1 28.1 26.2 106.4 12 76.5%

August

30.4 28.3 26.5 158.5 18 76.9%

September

29.7 27.5 25.5 154.3 19 78.7%

October

28.8 26 22.8 49.1 0 75.2%

November

26.9 23.3 19.5 4.2 0 72.4%

December

24.7 21.8 18.7 4.1 0 75.2%
The warmest avg. temperature is around 82.9°F / 28.3°C, August is the month with the highest temperature. January is the coolest with 67.8°F / 19.9°C average air temperature. January is the month with the min. precipitation of 0in / 0mm and September with the max. precipitation in a year with 6.2in / 158.5mm.

Activities & POI in Marathon

Type of Activity List
Beach Long Beach, Sombrero Beach, Calusa Beach, Loggerhead Beach, Sandspur Beach, Sunset Beach, Coca Plum Beach
Marina for Sailing, Boat adventures, fishing Bahai Honda Marina, Old Wooden Bridge Guest Cottages & Marina LLC, Sunshine Key Marina, Little Palm Island marina, Duck Key Marina, Grassy Key Marina, Driftwood Marina & Storage, Captain Hook's Marina & Dive Center, Sea Dog Charters Marina, Starfish Snorkel, Spirit Snorkeling, Marathon Marina & Boat Yard
Attraction Snorkel Tours, Old Seven Mile Bridge, New Seven Mile Bridge
Golf Course Sombrero Country Club, Key Colony Beach Golf
Caravan Site Grassy Key RV Park & Resort, 22, 26, 28, 36, 37, 38, 39, 4, 40, 41, 42, 44, 43, 45, 46, 47, 48, 5, 6, 7, 8, 9, 27, 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2, 20, 21, 23, 24, 25, 29, 3, 30, 31, 32, 33, 34, 35, Seahorse RV Park, Royal Palm RV Park, Sunshine Key RV Resort
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