Delaware Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Delaware Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Delaware Lake today is 26.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUL 14 | 26.0°C | 24.3°C | |
| JUL 15 | 28.6°C | 24.3°C | |
| JUL 16 | 28.6°C | 24.3°C | |
| JUL 17 | 27.8°C | 24.3°C | |
| JUL 18 | 27.3°C | 24.3°C | |
| JUL 19 | 27.3°C | 24.3°C | |
| JUL 20 | 27.3°C | 24.3°C | |
| JUL 21 | 26.9°C | 24.3°C | |
| JUL 22 | 24.3°C | 26.7°C | |
| JUL 23 | 24.3°C | 26.6°C | |
| JUL 24 | 24.3°C | 26.4°C | |
| JUL 25 | 24.3°C | 26.3°C | |
| JUL 26 | 24.3°C | 26.2°C | |
| JUL 27 | 24.3°C | 26.1°C | |
| JUL 28 | 24.3°C | 25.9°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 3°C | 5°C |
| February | 0°C | 3°C | 6°C |
| March | 2°C | 6°C | 10°C |
| April | 4°C | 10°C | 17°C |
| May | 13°C | 17°C | 21°C |
| June | 18°C | 22°C | 25°C |
| July | 20°C | 24°C | 29°C |
| August | 22°C | 26°C | 29°C |
| September | 21°C | 26°C | 30°C |
| October | 15°C | 20°C | 25°C |
| November | 5°C | 10°C | 15°C |
| December | 2°C | 6°C | 10°C |
Delaware Lake: Water Temperature by Location
Delaware Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Delaware Lake, the reservoir at Delaware State Park in central Ohio, follows the seasonal temperature pattern common to midwestern impoundments. In winter the surface commonly approaches freezing, around 32°F (0°C) or slightly lower where ice forms. Spring warming typically brings surface temperatures up into the 40s–60s°F (about 4–16°C) as snowmelt and runoff mix the water. By summer the lake often reaches the high 60s to upper 70s°F (20–26°C) and on hot stretches can climb into the low to mid 80s°F (27–29°C) at the surface; deeper water remains cooler. In autumn the surface cools again, generally moving through the 50s–60s°F (10–18°C) before winter refreezing.
Swimming is allowed in the reservoir environment under the control of Delaware State Park, but typically only in designated areas and during the warmer months when water temperatures are suitable. Restrictions exist because the lake serves multiple uses — flood control, boating, and fishing — and because safety and water quality vary across the reservoir. Boating traffic, variable depths and currents, and occasional algal blooms mean swimmers should use marked swim zones, heed park signage and advisories, and be aware that lifeguards may not be provided.