Clam Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Clam Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Clam Lake today is 18.6°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 | 20.9°C | 20.6°C | |
| SEP 15 | 19.1°C | 20.6°C | |
| SEP 16 | 19.3°C | 20.6°C | |
| SEP 17 | 19.2°C | 20.6°C | |
| SEP 18 | 18.6°C | 20.6°C | |
| SEP 19 | 18.7°C | 20.6°C | |
| SEP 20 | 18.7°C | 20.6°C | |
| SEP 22 | 20.6°C | 18.7°C | |
| SEP 23 | 20.6°C | 18.8°C | |
| SEP 24 | 20.6°C | 18.9°C | |
| SEP 25 | 20.6°C | 19.0°C | |
| SEP 26 | 20.6°C | 19.1°C | |
| SEP 27 | 20.6°C | 19.2°C | |
| SEP 28 | 20.6°C | 19.3°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 | 3°C | 6°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 3°C | 6°C |
| April | 2°C | 7°C | 12°C |
| May | 9°C | 14°C | 19°C |
| June | 16°C | 22°C | 27°C |
| July | 18°C | 23°C | 27°C |
| August | 20°C | 24°C | 28°C |
| September | 18°C | 21°C | 23°C |
| October | 6°C | 13°C | 19°C |
| November | 2°C | 8°C | 12°C |
| December | 1°C | 3°C | 6°C |
Clam Lake: Water Temperature by Location
Clam Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Clam Lake in northern Wisconsin experiences pronounced seasonal changes in water temperature. In winter the lake is typically ice-covered and water just beneath the ice stays near freezing, about 32–40°F (0–4°C). Spring thaw brings surface temperatures up to roughly 40–60°F (4–16°C) as the lake mixes and warms. Peak summer usually yields the warmest swimming conditions, with surface readings commonly in the 65–78°F range (18–26°C) on sunny, calm days; shallow bays can run a few degrees warmer. In fall the surface cools again to roughly 50–65°F (10–18°C) as the lake returns toward winter stratification.
Swimming at Clam Lake is allowed in the sense that people commonly enter the water, but opportunities depend on access, local rules and water conditions. Public access points and private shorelines vary, and there may be no lifeguarded beaches, so swimmers should be self-reliant. For comfort and safety most recreational swimming is concentrated in summer when temperatures reach the mid‑60s to upper‑70s °F (18–26°C); cold spring or fall waters can pose hypothermia or cold‑shock risks. Always observe posted advisories and exercise caution around ice in winter.