Spider Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Spider Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Spider Lake today is 20.1°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 |
|---|---|---|---|
| JUN 23 | 17.9°C | 16.5°C | |
| JUN 24 | 17.8°C | 16.5°C | |
| JUN 25 | 17.9°C | 16.5°C | |
| JUN 26 | 17.9°C | 16.5°C | |
| JUN 27 | 18.2°C | 16.5°C | |
| JUN 28 | 18.4°C | 16.5°C | |
| JUN 29 | 18.9°C | 16.5°C | |
| JUN 30 | 18.9°C | 16.5°C | |
| JUL 1 | 23.5°C | 20.3°C | |
| JUL 2 | 23.5°C | 20.4°C | |
| JUL 3 | 23.5°C | 20.6°C | |
| JUL 4 | 23.5°C | 20.8°C | |
| JUL 5 | 23.5°C | 21.0°C | |
| JUL 6 | 23.5°C | 21.1°C | |
| JUL 7 | 23.5°C | 21.3°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 | 1°C | 3°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 6°C | 11°C |
| May | 7°C | 13°C | 18°C |
| June | 12°C | 17°C | 21°C |
| July | 20°C | 24°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 | 2°C | 8°C | 13°C |
| December | 0°C | 3°C | 6°C |
Spider Lake: Water Temperature by Location
Spider Lake: Weather Forecast
July 1
July 2
July 3
July 4
July 5
July 6
Location & Local Information
Spider Lake in northern Wisconsin typically follows the seasonal temperature patterns of small glacial lakes in the region. After ice-off in spring, surface temperatures are cold, often in the 40–60°F range (4–15°C) as the water mixes and warms. By summer, surface temperatures commonly reach about 70–80°F (21–27°C) on warm days, with the warmest readings in shallow bays and nearshore areas; deeper layers remain cooler. In autumn the surface cools to roughly 50–65°F (10–18°C) as air temperatures drop, and in winter the lake is usually ice-covered with surface temperatures at or near freezing (32°F / 0°C) while the water below the ice stays near 39°F (4°C).
Swimming is generally possible and popular in the warm months when surface temperatures are comfortable, especially late June through August, but it is not recommended during spring cold spells or once ice returns in late fall/winter. Access and specific rules vary by shoreland ownership, public access points, and local authorities, and water quality advisories (for issues such as algal blooms) or safety signage can restrict swimming. As with any lake, swimmers should be mindful of sudden temperature changes, underwater hazards, and the absence of lifeguards.