Current sea water temperature:
+84.4°F
| Minimum sea water temperature in May: | 88.0°F |
| Maximum sea water temperature in May: | 77.4°F |
| Average sea water temperature in May: | 82.4°F |
| more information | |
14 days
forecast
forecast
| Marco Island |
monthly
weather
weather
| Marco Island |
Sea water temperature for the last 10 days:
| May 18 | 84.4°F | May 13 | 83.8°F |
| May 17 | 83.7°F | May 12 | 83.7°F |
| May 16 | 84.2°F | May 11 | 82.8°F |
| May 15 | 85.1°F | May 10 | 82.4°F |
| May 14 | 85.1°F | May 9 | 81.9°F |
Monthly sea water temperature, °F
When is the warmest sea in Marco Island?
Based on the data about daily sea water temperature for the last three years the warmest sea in Marco Island was noticed in August, July and September.
Monthly Sea Temperatures in Marco Island, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 88.7°F. The highest and lowest sea temperatures during the month were 90.0°F and 86.9°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 86.6°F. The highest and lowest sea temperatures during the month were 89.4°F and 84.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 86.0°F. The highest and lowest sea temperatures during the month were 88.7°F and 84.2°F.
current
weather
weather
| Marco Island |
weather in
May
May
| Marco Island |
Best time for vacation in Marco Island
Marco Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Marco Island
Local time: 11:59
May 18, monday
1200
86°F
NW
11 mph
11 mph
1500
90°F
NW
12 mph
12 mph
1800
86°F
W
13 mph
13 mph
2100
81°F
W
11 mph
11 mph
May 19, tuesday
0000
79°F
W
14 mph
14 mph
0300
77°F
W
12 mph
12 mph
0600
75°F
SW
12 mph
12 mph
0900
81°F
W
12 mph
12 mph
