Blue Heron Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Blue Heron Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Blue Heron Lake today is 20.9°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 13 | 22.3°C | 24.5°C | |
| SEP 14 | 23.0°C | 24.5°C | |
| SEP 15 | 22.3°C | 24.5°C | |
| SEP 16 | 21.5°C | 24.5°C | |
| SEP 17 | 21.8°C | 24.5°C | |
| SEP 18 | 21.2°C | 24.5°C | |
| SEP 19 | 20.6°C | 24.5°C | |
| SEP 20 | 20.4°C | 24.5°C | |
| SEP 21 | 24.5°C | 21.1°C | |
| SEP 22 | 24.5°C | 21.3°C | |
| SEP 23 | 24.5°C | 21.4°C | |
| SEP 24 | 24.5°C | 21.6°C | |
| SEP 25 | 24.5°C | 21.8°C | |
| SEP 26 | 24.5°C | 22.0°C | |
| SEP 27 | 24.5°C | 22.2°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 | 1°C | 3°C |
| February | 0°C | 3°C | 6°C |
| March | 1°C | 6°C | 12°C |
| April | 6°C | 11°C | 17°C |
| May | 10°C | 16°C | 22°C |
| June | 17°C | 23°C | 29°C |
| July | 23°C | 27°C | 30°C |
| August | 23°C | 28°C | 32°C |
| September | 21°C | 25°C | 28°C |
| October | 11°C | 17°C | 23°C |
| November | 3°C | 9°C | 15°C |
| December | 0°C | 2°C | 4°C |
Blue Heron Lake: Water Temperature by Location
Blue Heron Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Blue Heron Lake in Iowa typically follows the seasonal temperature patterns common to shallow Midwestern lakes. In winter the surface often hovers around freezing, roughly 32–40°F (0–4°C), and can form ice when conditions permit. Spring sees a steady rise as the lake warms to about 40–65°F (4–18°C) depending on how early the air temperatures warm. Peak summer surface temperatures are usually in the range of 68–82°F (20–28°C), with the warmest days occasionally pushing a few degrees higher in shallow bays. During autumn the water cools again, often falling back into the 45–65°F (7–18°C) band as air temperatures drop and mixing increases. These ranges can vary year to year with weather, depth, and shading.
Swimming opportunities at Blue Heron Lake depend on local management and current water quality rather than a blanket prohibition. Many community lakes permit swimming where a designated beach or entry point exists, but some areas are posted as no‑swim due to hazards, lack of lifeguards, or periodic algae blooms. Because water temperatures drop quickly outside midsummer and cyanobacteria can occur during warm, calm periods, swimmers should follow posted signs, check for advisories from park authorities, and understand that swimming may be allowed “at your own risk” when no lifeguard is present.