Wonder Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Wonder Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Wonder Lake today is 19°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 | 20.5°C | 18.7°C | |
| SEP 15 | 21.2°C | 18.7°C | |
| SEP 16 | 19.0°C | 18.7°C | |
| SEP 17 | 19.3°C | 18.7°C | |
| SEP 18 | 18.8°C | 18.7°C | |
| SEP 19 | 19.5°C | 18.7°C | |
| SEP 20 | 19.0°C | 18.7°C | |
| SEP 22 | 18.7°C | 19.0°C | |
| SEP 23 | 18.7°C | 19.0°C | |
| SEP 24 | 18.7°C | 19.0°C | |
| SEP 25 | 18.7°C | 18.9°C | |
| SEP 26 | 18.7°C | 18.9°C | |
| SEP 27 | 18.7°C | 18.9°C | |
| SEP 28 | 18.7°C | 18.9°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 | 2°C | 4°C | 7°C |
| February | 2°C | 5°C | 7°C |
| March | 1°C | 4°C | 8°C |
| April | 5°C | 9°C | 14°C |
| May | 10°C | 16°C | 22°C |
| June | 16°C | 20°C | 23°C |
| July | 18°C | 24°C | 30°C |
| August | 23°C | 26°C | 29°C |
| September | 13°C | 19°C | 25°C |
| October | 8°C | 14°C | 20°C |
| November | 0°C | 6°C | 12°C |
| December | 0°C | 3°C | 7°C |
Wonder Lake: Water Temperature by Location
Wonder Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Wonder Lake’s surface water follows the pattern typical of small Midwestern reservoirs: it is cold through late winter and spring, warms through early summer, and peaks in mid to late summer before cooling again in the fall. Typical seasonal surface ranges are roughly 32–40°F (0–4°C) in winter when ice or near‑freezing conditions can occur; 40–65°F (4–18°C) in spring as the water mixes and gains heat; 70–85°F (21–29°C) in summer at the warmest, especially during heat waves; and 45–65°F (7–18°C) in autumn as temperatures decline. Actual temperatures vary by depth, time of day, recent weather, and how much shading or inflow the lake receives, and deeper water stays cooler through the warm months.
Swimming in Wonder Lake is treated like most community lakes: recreational swimming is generally allowed in places designated or approved by local authorities and homeowners’ associations, because the lake is used for leisure by residents and visitors. Access and permitted activities may be limited by local rules, private property boundaries, posted advisories, or water‑quality and safety concerns (algae blooms, bacterial tests, submerged vegetation, or boating traffic). Visitors should observe signage and check with local officials or the lake association for current swimming advisories and designated swim areas.