Michael J Kirwan Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Michael J Kirwan Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Michael J Kirwan Reservoir today is 55°F.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| MAY 6 | 57°F | 62°F | |
| MAY 7 | 58°F | 62°F | |
| MAY 8 | 55°F | 62°F | |
| MAY 9 | 55°F | 62°F | |
| MAY 10 | 56°F | 62°F | |
| MAY 11 | 55°F | 62°F | |
| MAY 12 | 55°F | 62°F | |
| MAY 13 | 55°F | 62°F | |
| MAY 14 | 62°F | 56°F | |
| MAY 15 | 62°F | 56°F | |
| MAY 16 | 62°F | 56°F | |
| MAY 17 | 62°F | 57°F | |
| MAY 18 | 62°F | 57°F | |
| MAY 19 | 62°F | 58°F | |
| MAY 20 | 62°F | 58°F |
* 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 | 32°F | 39°F | 45°F |
| February | 32°F | 39°F | 45°F |
| March | 34°F | 42°F | 50°F |
| April | 41°F | 51°F | 63°F |
| May | 54°F | 62°F | 70°F |
| June | 59°F | 66°F | 73°F |
| July | 70°F | 75°F | 79°F |
| August | 70°F | 74°F | 79°F |
| September | 70°F | 74°F | 79°F |
| October | 63°F | 68°F | 73°F |
| November | 43°F | 53°F | 63°F |
| December | 37°F | 42°F | 46°F |
Michael J Kirwan Reservoir: Water Temperature by Location
Michael J Kirwan Reservoir: Weather Forecast
May 14
May 15
May 16
May 17
May 18
Location & Local Information
Michael J. Kirwan Reservoir experiences typical temperate-lake seasonal shifts in surface temperatures. In winter the lake commonly approaches freezing, about 32–40°F (0–4°C). Spring warming generally brings surface values into the 40–60°F range (4–16°C) as ice melts and sun angles rise. Summer surface temperatures often peak between roughly 70–78°F (21–26°C), though occasional heat waves can push warmer; at the same time deeper water remains substantially colder, often 40–50°F (4–10°C), because the reservoir stratifies. In autumn the surface cools back to around 50–65°F (10–18°C) as turnover begins. These figures vary with weather, wind, inflows and exact sampling location on the reservoir.
Swimming at the Michael J. Kirwan Reservoir is generally not promoted in the way a staffed beach would be; there are no widely advertised public swimming beaches and open-water swimming is typically discouraged for safety and management reasons. Sudden depth changes, submerged hazards, boat traffic, cold deep water and water-quality or operational considerations related to reservoir management make unregulated swimming risky. Recreational use tends to focus on boating and fishing, and anyone considering entering the water should follow local posted rules and guidance from the managing agency.