Plum Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Plum Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Plum Lake today is 27°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 | 21.1°C | 20.7°C | |
| JUL 15 | 23.0°C | 20.7°C | |
| JUL 16 | 23.1°C | 20.7°C | |
| JUL 17 | 23.1°C | 20.7°C | |
| JUL 18 | 24.7°C | 20.7°C | |
| JUL 19 | 24.7°C | 20.7°C | |
| JUL 20 | 25.1°C | 20.7°C | |
| JUL 21 | 24.9°C | 20.7°C | |
| JUL 22 | 20.7°C | 26.7°C | |
| JUL 23 | 20.7°C | 26.4°C | |
| JUL 24 | 20.7°C | 26.1°C | |
| JUL 25 | 20.7°C | 25.7°C | |
| JUL 26 | 20.7°C | 25.4°C | |
| JUL 27 | 20.7°C | 25.1°C | |
| JUL 28 | 20.7°C | 24.8°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 | 0°C | 1°C | 3°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 4°C | 7°C |
| May | 6°C | 12°C | 18°C |
| June | 15°C | 18°C | 21°C |
| July | 14°C | 21°C | 27°C |
| August | 18°C | 24°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 13°C | 17°C |
| November | 3°C | 8°C | 13°C |
| December | 0°C | 2°C | 4°C |
Plum Lake: Water Temperature by Location
Plum Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Plum Lake in northern Wisconsin experiences a wide seasonal range in water temperatures. In spring (April–May) surface temperatures commonly sit between about 40–60°F (4–16°C) as the lake cools out of winter. By summer (June–August) the shallow nearshore water typically warms to roughly 65–78°F (18–26°C), with the warmest readings often in July. In autumn (September–October) temperatures fall back to roughly 50–65°F (10–18°C) as cooling begins, and in winter the lake is usually ice-covered with surface water around freezing, about 32–39°F (0–4°C) beneath the ice depending on conditions and depth.
Swimming is generally allowed during the ice-free months because surface temperatures frequently rise into a comfortable range for recreational swimming, especially in July and August when nearshore areas are warmest. Deep water remains noticeably colder year-round due to stratification, so swimmers should remain near shore and be aware of sudden temperature changes. In winter, swimming is not typical because of ice cover and hypothermia risk; any ice swimming should only be attempted with proper safety measures. Local health and access advisories affect specific swimming sites, so checking current guidance before entering the water is advisable.