Hamilton Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Hamilton Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Hamilton Lake today is 16.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| OCT 5 | 18.9°C | 18.0°C | |
| OCT 6 | 18.5°C | 18.0°C | |
| OCT 7 | 18.5°C | 18.0°C | |
| OCT 8 | 17.6°C | 18.0°C | |
| OCT 9 | 17.8°C | 18.0°C | |
| OCT 10 | 17.8°C | 18.0°C | |
| OCT 11 | 17.0°C | 18.0°C | |
| OCT 12 | 17.2°C | 18.0°C | |
| OCT 13 | 18.0°C | 16.6°C | |
| OCT 14 | 18.0°C | 16.7°C | |
| OCT 15 | 18.0°C | 16.7°C | |
| OCT 16 | 18.0°C | 16.8°C | |
| OCT 17 | 18.0°C | 16.9°C | |
| OCT 18 | 18.0°C | 17.0°C | |
| OCT 19 | 18.0°C | 17.0°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 | 3°C | 5°C |
| March | 2°C | 5°C | 8°C |
| April | 5°C | 11°C | 17°C |
| May | 11°C | 15°C | 19°C |
| June | 16°C | 20°C | 24°C |
| July | 21°C | 25°C | 29°C |
| August | 23°C | 26°C | 29°C |
| September | 21°C | 25°C | 29°C |
| October | 15°C | 18°C | 21°C |
| November | 6°C | 11°C | 15°C |
| December | 2°C | 5°C | 8°C |
Hamilton Lake: Water Temperature by Location
Hamilton Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Hamilton Lake in Indiana typically follows the seasonal temperature patterns of small Midwestern lakes. Surface water in spring often ranges from about 40–68°F (4–20°C) as the lake comes out of winter stratification, while summer surface temperatures commonly sit between roughly 70–82°F (21–28°C) on warm days, making the upper layers pleasantly warm for many swimmers. In early fall the surface cools to about 50–68°F (10–20°C), and by winter the open water hovers near freezing to the low 40s°F (0–4°C) when not ice-covered. Because Hamilton Lake is relatively shallow in places, surface temperatures can change quickly with air temperature and wind, and deeper water remains colder than the surface during warm months.
Swimming is generally possible at Hamilton Lake during the warmer months where shoreline access and local rules allow it, and summer temperatures often fall within ranges comfortable for recreational swimming. However, seasonal cold water in spring and fall can produce cold-shock and hypothermia risks, and winter ice is hazardous without proper assessment; local authorities sometimes post advisories or restrict swimming for water-quality or safety reasons. Visitors should check current water-quality notifications, observe posted signage, and be aware that lifeguards are not always present before deciding to swim.