Alum Creek Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Alum Creek Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Alum Creek Reservoir today is 22.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 23 | 21.6°C | 21.0°C | |
| JUN 24 | 21.6°C | 21.0°C | |
| JUN 25 | 21.6°C | 21.0°C | |
| JUN 26 | 21.6°C | 21.0°C | |
| JUN 27 | 21.8°C | 21.0°C | |
| JUN 28 | 22.0°C | 21.0°C | |
| JUN 29 | 21.3°C | 21.0°C | |
| JUN 30 | 22.1°C | 21.0°C | |
| JUL 1 | 24.0°C | 22.2°C | |
| JUL 2 | 24.0°C | 22.3°C | |
| JUL 3 | 24.0°C | 22.4°C | |
| JUL 4 | 24.0°C | 22.5°C | |
| JUL 5 | 24.0°C | 22.6°C | |
| JUL 6 | 24.0°C | 22.7°C | |
| JUL 7 | 24.0°C | 22.8°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 | 11°C |
| April | 4°C | 11°C | 18°C |
| May | 13°C | 17°C | 21°C |
| June | 17°C | 21°C | 25°C |
| July | 21°C | 24°C | 27°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 |
Alum Creek Reservoir: Water Temperature by Location
Alum Creek Reservoir: Weather Forecast
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Location & Local Information
Alum Creek Reservoir experiences typical Midwestern seasonal water temperatures that change markedly through the year. In winter the surface can approach freezing and often forms ice, with temperatures near 32°F (0°C) or colder in late season. Spring sees a gradual rise, commonly ranging from about 40–65°F (4–18°C) as the water stratifies. Summer brings the warmest conditions, with surface readings frequently between 70–85°F (21–29°C) and occasionally reaching the high 80s°F (around 30°C) during heat waves; deeper water remains cooler. During autumn the lake cools again, typically falling to roughly 45–65°F (7–18°C) before winter turnover. Short-term variations are common depending on recent weather, inflows and depth.
Swimming at Alum Creek is permitted in designated beach and swim areas during the park’s posted season, and those areas are managed for safety with rules and often lifeguards on duty when open. Swimming outside marked zones is discouraged because of boat traffic, variable depths and underwater hazards. Water-quality advisories, including occasional harmful algal bloom or bacterial warnings after heavy rains, can temporarily close swimming areas, so visitors should observe posted notices before entering the water.