Holloway Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Holloway Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Holloway Reservoir today is 20°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| SEP 14 | 20.8°C | 22.5°C | |
| SEP 15 | 21.1°C | 22.5°C | |
| SEP 16 | 19.8°C | 22.5°C | |
| SEP 17 | 20.0°C | 22.5°C | |
| SEP 18 | 20.1°C | 22.5°C | |
| SEP 19 | 19.9°C | 22.5°C | |
| SEP 20 | 19.7°C | 22.5°C | |
| SEP 22 | 22.5°C | 20.1°C | |
| SEP 23 | 22.5°C | 20.3°C | |
| SEP 24 | 22.5°C | 20.4°C | |
| SEP 25 | 22.5°C | 20.5°C | |
| SEP 26 | 22.5°C | 20.6°C | |
| SEP 27 | 22.5°C | 20.8°C | |
| SEP 28 | 22.5°C | 20.9°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 | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 1°C | 4°C | 7°C |
| April | 4°C | 9°C | 14°C |
| May | 10°C | 15°C | 20°C |
| June | 17°C | 21°C | 24°C |
| July | 22°C | 25°C | 28°C |
| August | 22°C | 25°C | 28°C |
| September | 18°C | 23°C | 27°C |
| October | 14°C | 17°C | 20°C |
| November | 4°C | 9°C | 14°C |
| December | 0°C | 3°C | 6°C |
Holloway Reservoir: Water Temperature by Location
Holloway Reservoir: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake of Holloway Reservoir in Michigan typically follows the seasonal temperature patterns of small inland reservoirs. Surface water in winter often falls to near freezing, roughly 25–35°F (−4 to 2°C) when ice is present, while spring thaw brings temperatures up into the 40–60°F (4–16°C) range as the water mixes. During summer the warmest surface readings commonly reach the low to mid 70s°F, about 21–26°C, occasionally touching the upper 70s°F (around 25–27°C) on hot weeks; deeper layers remain much cooler due to thermal stratification. In autumn the reservoir cools again, generally spanning 45–60°F (7–16°C) as surface water loses heat.
Swimming at Holloway Reservoir depends on local access, posted rules, and water-quality conditions. Where public access and informal beaches exist, recreational swimming is often tolerated, but formal permission varies because reservoirs can be managed for flood control, municipal supply, or habitat, and may carry restrictions. Safety concerns such as submerged structures, boat traffic, strong currents near inlets or the dam, and seasonal cold-water shock or hypothermia—particularly in spring and late fall—are reasons officials may limit or advise against swimming. Visitors should observe signage, check municipal or county advisories, and consider water temperature and quality before entering.