Lake Waconia — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Waconia, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Waconia today is 18.3°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 |
|---|---|---|---|
| SEP 14 | 20.7°C | 20.6°C | |
| SEP 15 | 19.7°C | 20.6°C | |
| SEP 16 | 19.9°C | 20.6°C | |
| SEP 17 | 18.4°C | 20.6°C | |
| SEP 18 | 18.4°C | 20.6°C | |
| SEP 19 | 18.4°C | 20.6°C | |
| SEP 20 | 18.7°C | 20.6°C | |
| SEP 21 | 18.3°C | 20.6°C | |
| SEP 22 | 20.6°C | 18.4°C | |
| SEP 23 | 20.6°C | 18.5°C | |
| SEP 24 | 20.6°C | 18.6°C | |
| SEP 25 | 20.6°C | 18.8°C | |
| SEP 26 | 20.6°C | 18.9°C | |
| SEP 27 | 20.6°C | 19.0°C | |
| SEP 28 | 20.6°C | 19.1°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 | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 2°C | 7°C | 13°C |
| May | 9°C | 15°C | 21°C |
| June | 17°C | 22°C | 27°C |
| July | 21°C | 24°C | 27°C |
| August | 21°C | 25°C | 28°C |
| September | 18°C | 21°C | 24°C |
| October | 6°C | 13°C | 19°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 4°C | 7°C |
Lake Waconia: Water Temperature by Location
Lake Waconia: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Lake Waconia’s surface temperatures vary widely through the year because it is a midwestern lake that stratifies in summer and freezes in winter. In the warmest months of July and August, surface readings typically range from about 70 to 78°F (21 to 26°C), with near-shore shallows occasionally warmer. Early summer and early fall usually see temperatures between roughly 60 and 70°F (16 to 21°C), while spring after ice-out often sits in the 40s to low 60s°F (4 to 16°C) depending on sunshine and wind. In winter the lake is ice-covered and water just below the ice is near freezing, around 32–34°F (0–1°C).
Swimming is generally permitted at designated public beaches and access points around the lake, and residents and visitors use these areas for recreational swimming during the warm season. Local authorities monitor water quality and may close swim areas if bacteria levels or harmful algal blooms become a concern, so advisories are posted when needed. Swimmers should also be mindful of colder water outside peak summer months, boat traffic in open areas, and the limited likelihood of lifeguards at some sites; these factors affect safety even when swimming is allowed.