Lake Rupert — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Rupert, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Rupert today is 26.5°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 |
|---|---|---|---|
| AUG 4 | 26.6°C | 27.5°C | |
| AUG 5 | 26.6°C | 27.5°C | |
| AUG 6 | 27.0°C | 27.5°C | |
| AUG 7 | 27.5°C | 27.5°C | |
| AUG 8 | 27.8°C | 27.5°C | |
| AUG 9 | 27.9°C | 27.5°C | |
| AUG 10 | 26.6°C | 27.5°C | |
| AUG 11 | 26.6°C | 27.5°C | |
| AUG 12 | 27.5°C | 26.6°C | |
| AUG 13 | 27.5°C | 26.6°C | |
| AUG 14 | 27.5°C | 26.7°C | |
| AUG 15 | 27.5°C | 26.7°C | |
| AUG 16 | 27.5°C | 26.8°C | |
| AUG 17 | 27.5°C | 26.8°C | |
| AUG 18 | 27.5°C | 26.9°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 | 1°C | 5°C | 8°C |
| February | 1°C | 5°C | 9°C |
| March | 1°C | 7°C | 14°C |
| April | 3°C | 12°C | 21°C |
| May | 14°C | 19°C | 24°C |
| June | 19°C | 24°C | 28°C |
| July | 19°C | 25°C | 30°C |
| August | 23°C | 28°C | 32°C |
| September | 21°C | 27°C | 33°C |
| October | 15°C | 19°C | 22°C |
| November | 6°C | 11°C | 16°C |
| December | 1°C | 6°C | 9°C |
Lake Rupert: Water Temperature by Location
Lake Rupert: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Lake Rupert in Ohio experiences the same seasonal swings common to small inland lakes in the region. Surface temperatures typically hover near freezing in winter, about 32–40°F (0–4°C), and rise through spring to roughly 40–60°F (4–16°C) as the water stratifies. In summer, surface readings are usually in the neighborhood of 68–82°F (20–28°C), with the warmest, shallow bays sometimes reaching the high 70s or low 80s°F (mid-20s to high-20s °C) on hot, calm days. As autumn advances the lake cools back to roughly 50–65°F (10–18°C) before returning to winter conditions. Deeper water remains colder year-round, so temperatures vary with depth, wind, and recent weather.
Swimming opportunities at Lake Rupert depend on access, local rules, and water quality rather than on temperature alone. During summer months, residents and visitors commonly swim where public access or private shorelines permit because surface temperatures are comfortable for recreation; lifeguards may not be present, so caution is advised. Swimming may be restricted or discouraged if local authorities post advisories for high bacteria counts, harmful algal blooms, strong currents near inlets/outlets, or unsafe underwater hazards. Always follow posted signs and current local health or park guidance before entering the water.