Twelve Mile Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Twelve Mile Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Twelve Mile Lake today is 21.4°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 15 | 22.5°C | 24.4°C | |
| SEP 16 | 22.5°C | 24.4°C | |
| SEP 17 | 22.4°C | 24.4°C | |
| SEP 18 | 22.1°C | 24.4°C | |
| SEP 19 | 20.4°C | 24.4°C | |
| SEP 20 | 19.6°C | 24.4°C | |
| SEP 21 | 20.2°C | 24.4°C | |
| SEP 22 | 20.8°C | 24.4°C | |
| SEP 23 | 24.4°C | 21.6°C | |
| SEP 24 | 24.4°C | 21.7°C | |
| SEP 25 | 24.4°C | 21.9°C | |
| SEP 26 | 24.4°C | 22.0°C | |
| SEP 27 | 24.4°C | 22.2°C | |
| SEP 28 | 24.4°C | 22.3°C | |
| SEP 29 | 24.4°C | 22.5°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 | 4°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 5°C | 11°C |
| April | 7°C | 12°C | 17°C |
| May | 12°C | 17°C | 22°C |
| June | 19°C | 22°C | 25°C |
| July | 23°C | 28°C | 33°C |
| August | 24°C | 27°C | 30°C |
| September | 22°C | 24°C | 27°C |
| October | 13°C | 18°C | 22°C |
| November | 4°C | 9°C | 14°C |
| December | 1°C | 3°C | 6°C |
Twelve Mile Lake: Water Temperature by Location
Twelve Mile Lake: Weather Forecast
September 24
September 25
September 26
September 27
Location & Local Information
Twelve Mile Lake in Iowa follows the typical temperate-lake seasonal cycle. In spring the water is cool, often in the 40–60°F range (about 4–16°C) as runoff and groundwater dominate. By early summer temperatures commonly climb into the 60s°F (15–21°C) and throughout midsummer surface temperatures frequently range from roughly 70–80°F (21–27°C), with occasional warm spells pushing into the low 80s°F (around 27–28°C) on shallow, sheltered bays. In autumn the lake cools back to roughly 50–65°F (10–18°C) as air temperatures drop. In winter the surface approaches freezing and often forms ice at or below 32°F (0°C), ending open-water recreation until thaw.
Swimming at Twelve Mile Lake is generally permitted because it is a public recreational waterbody managed for multiple uses, including boating and bathing, but conditions vary by season and location. There may be no staffed beach or lifeguard, and local authorities can close areas temporarily for safety or water-quality reasons such as algal blooms, high bacteria counts, strong currents near inlets, or heavy boat traffic. Visitors should check current advisories from local conservation or county officials before swimming, be aware of natural hazards, and choose shallower, calmer spots if planning to enter the water.