Acton Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Acton Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Acton Lake today is 18.2°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 |
|---|---|---|---|
| OCT 5 | 20.5°C | 21.0°C | |
| OCT 6 | 20.2°C | 21.0°C | |
| OCT 7 | 20.1°C | 21.0°C | |
| OCT 8 | 19.2°C | 21.0°C | |
| OCT 9 | 19.4°C | 21.0°C | |
| OCT 10 | 18.8°C | 21.0°C | |
| OCT 11 | 19.0°C | 21.0°C | |
| OCT 12 | 19.0°C | 21.0°C | |
| OCT 13 | 21.0°C | 18.3°C | |
| OCT 14 | 21.0°C | 18.5°C | |
| OCT 15 | 21.0°C | 18.6°C | |
| OCT 16 | 21.0°C | 18.8°C | |
| OCT 17 | 21.0°C | 18.9°C | |
| OCT 18 | 21.0°C | 19.0°C | |
| OCT 19 | 21.0°C | 19.2°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 | 4°C | 9°C |
| February | 1°C | 3°C | 6°C |
| March | 2°C | 7°C | 13°C |
| April | 4°C | 11°C | 18°C |
| May | 13°C | 17°C | 22°C |
| June | 18°C | 22°C | 25°C |
| July | 21°C | 25°C | 29°C |
| August | 23°C | 26°C | 29°C |
| September | 21°C | 26°C | 30°C |
| October | 17°C | 21°C | 25°C |
| November | 6°C | 12°C | 17°C |
| December | 4°C | 7°C | 10°C |
Acton Lake: Water Temperature by Location
Acton Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
Location & Local Information
Acton Lake’s water temperatures follow the seasonal patterns typical of midwestern reservoirs. In winter the surface commonly hovers near freezing, roughly 34–40°F (1–4°C). Spring brings a steady rise, with waters generally between about 40–60°F (4–16°C) as the lake mixes and warms. Peak summer temperatures often reach the warmest range, roughly 70–80°F (21–27°C) in open, shallow areas during heat spells, though nights and deeper spots remain cooler. In autumn the lake cools again, typically settling between 50–65°F (10–18°C) as air temperatures drop and stratification breaks down.
Swimming in Acton Lake is not offered as a formal recreational activity because there are no designated swim beaches and the site is managed with safety and resource concerns in mind. The absence of lifeguards, the presence of boat traffic, submerged structures and variable currents can present hazards, and periodic water‑quality issues such as algal blooms further limit safe contact recreation. For those visiting, shoreline access, fishing and boating are the primary activities supported, while entering the water for unsupervised swimming is discouraged and typically not allowed under the lake’s management policies.