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 21.5°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 |
|---|---|---|---|
| SEP 14 | 22.4°C | 25.0°C | |
| SEP 15 | 23.0°C | 25.0°C | |
| SEP 16 | 21.4°C | 25.0°C | |
| SEP 17 | 21.2°C | 25.0°C | |
| SEP 18 | 21.7°C | 25.0°C | |
| SEP 19 | 21.9°C | 25.0°C | |
| SEP 20 | 21.3°C | 25.0°C | |
| SEP 22 | 25.0°C | 21.7°C | |
| SEP 23 | 25.0°C | 21.9°C | |
| SEP 24 | 25.0°C | 22.0°C | |
| SEP 25 | 25.0°C | 22.2°C | |
| SEP 26 | 25.0°C | 22.4°C | |
| SEP 27 | 25.0°C | 22.6°C | |
| SEP 28 | 25.0°C | 22.7°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
September 21
September 22
September 23
September 24
September 25
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.