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Water temperature in Greencastle (IN) in August

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Is it warm enough to swim in Greencastle in August? Average water temperature in Greencastle in August is 73.8°F and therefore suitable for comfortable swimming. The warmest water in Greencastle in August is 80.6°F, and the coldest is 68°F. To find out the water temperature today and in the coming days, go to Current water temperature in Greencastle

Changes water temperature in Greencastle in August 2025, 2024

To get an accurate forecast for the water temperature in Greencastle for any chosen month, compare two years within a 10 year range using the chart below.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024
August 175.2°F 
August 275.2°F77°F
August 373.4°F78.8°F
August 471.6°F 
August 573.4°F 
August 673.4°F77°F
August 775.2°F75.2°F
August 877°F75.2°F
August 978.8°F71.6°F
August 1078.8°F 
August 1178.8°F69.8°F
August 1278.8°F 
August 1378.8°F 
August 1480.6°F69.8°F
August 1580.6°F71.6°F
Day 2025 2024
August 1680.6°F71.6°F
August 1778.8°F71.6°F
August 1880.6°F71.6°F
August 1978.8°F69.8°F
August 2077°F69.8°F
August 2175.2°F68°F
August 2273.4°F68°F
August 2371.6°F68°F
August 2468°F71.6°F
August 2568°F73.4°F
August 2666.2°F75.2°F
August 2768°F77°F
August 2864.4°F78.8°F
August 2964.4°F78.8°F
August 3064.4°F78.8°F
August 3166.2°F75.2°F

Greencastle water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in August?

Want to know where the water temperature in August is good for swimming? Select the continent of interest, the day of the month and the required water temperature

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Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Greencastle is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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