Lake Vermilion — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Vermilion, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Vermilion today is 29.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 |
|---|---|---|---|
| JUL 14 | 26.0°C | 26.2°C | |
| JUL 15 | 29.4°C | 26.2°C | |
| JUL 16 | 29.4°C | 26.2°C | |
| JUL 17 | 29.4°C | 26.2°C | |
| JUL 18 | 29.3°C | 26.2°C | |
| JUL 19 | 29.5°C | 26.2°C | |
| JUL 20 | 29.5°C | 26.2°C | |
| JUL 21 | 29.5°C | 26.2°C | |
| JUL 22 | 26.2°C | 29.3°C | |
| JUL 23 | 26.2°C | 29.2°C | |
| JUL 24 | 26.2°C | 29.0°C | |
| JUL 25 | 26.2°C | 28.8°C | |
| JUL 26 | 26.2°C | 28.7°C | |
| JUL 27 | 26.2°C | 28.5°C | |
| JUL 28 | 26.2°C | 28.3°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 | 4°C |
| February | 1°C | 8°C | 14°C |
| March | 3°C | 9°C | 15°C |
| April | 8°C | 13°C | 18°C |
| May | 15°C | 18°C | 21°C |
| June | 18°C | 21°C | 25°C |
| July | 23°C | 26°C | 30°C |
| August | 22°C | 25°C | 27°C |
| September | 20°C | 23°C | 26°C |
| October | 6°C | 14°C | 22°C |
| November | 8°C | 14°C | 19°C |
| December | 1°C | 5°C | 8°C |
Lake Vermilion: Water Temperature by Location
Lake Vermilion: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Lake Vermilion in Illinois experiences typical Midwestern seasonal surface temperatures that vary widely through the year. In spring the water commonly ranges from about 40–60°F (4–16°C) as the lake cools from winter and warms with increasing air temperatures. Summer surface values are most comfortable for recreation, often running roughly 70–82°F (21–28°C) in July and August on warm afternoons, though shallow bays can be a few degrees warmer. By fall the surface cools back to roughly 50–65°F (10–18°C) before winter sets in; winter temperatures frequently approach freezing, with surface readings near 32–40°F (0–4°C) and ice cover possible in sustained cold periods. Deeper water stays colder year-round, and short-term weather, wind and inflows can shift those numbers.
Swimming is generally allowed at Lake Vermilion in designated public swimming areas and at private lakeshore properties, because the lake is managed for multiple recreational uses including bathing and boating. Availability depends on local rules, posted signage and water-quality advisories; some spots may be closed after heavy rain, algal blooms or for safety reasons such as strong currents or boat traffic. For safe swimming, follow posted rules, heed health advisories, and be aware that shallow summer areas warm most quickly while deeper zones remain cool.