Keller Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Keller Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Keller Lake today is 18.7°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 | 22.3°C | 21.8°C | |
| SEP 15 | 21.6°C | 21.8°C | |
| SEP 16 | 20.7°C | 21.8°C | |
| SEP 17 | 18.9°C | 21.8°C | |
| SEP 18 | 19.0°C | 21.8°C | |
| SEP 19 | 19.2°C | 21.8°C | |
| SEP 20 | 19.5°C | 21.8°C | |
| SEP 21 | 18.7°C | 21.8°C | |
| SEP 22 | 21.8°C | 18.9°C | |
| SEP 23 | 21.8°C | 19.0°C | |
| SEP 24 | 21.8°C | 19.2°C | |
| SEP 25 | 21.8°C | 19.3°C | |
| SEP 26 | 21.8°C | 19.5°C | |
| SEP 27 | 21.8°C | 19.6°C | |
| SEP 28 | 21.8°C | 19.8°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 | 1°C | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 3°C | 9°C | 15°C |
| May | 10°C | 16°C | 22°C |
| June | 16°C | 22°C | 27°C |
| July | 22°C | 25°C | 28°C |
| August | 20°C | 25°C | 29°C |
| September | 18°C | 22°C | 26°C |
| October | 6°C | 13°C | 19°C |
| November | 3°C | 8°C | 12°C |
| December | 0°C | 4°C | 6°C |
Keller Lake: Water Temperature by Location
Keller Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Keller Lake’s water temperature follows the familiar seasonal pattern of small lakes in Minnesota. During summer the shallow surface water commonly rises into the high 60s to mid‑70s °F (about 20–24 °C), with occasional warm spells pushing temps into the upper 70s °F (around 25–26 °C) on calm, sunny days. Spring and early summer are much cooler as snowmelt and runoff keep the lake in the 40s–60s °F (4–15 °C) range, while autumn sees a steady decline back toward 40–50 °F (4–10 °C) as the lake cools and mixes. In winter the lake is typically ice-covered and water just below the ice is near freezing, roughly 32–36 °F (0–2 °C). Temperatures vary with depth, wind, recent weather and inflows, so measured values at the surface will not always reflect deeper conditions.
Swimming at Keller Lake is generally done during the ice‑free months when surface temperatures are warm enough for comfort. Recreational swimming is allowed unless specific local rules, posted advisories or water‑quality issues such as algal blooms temporarily restrict use; public access points, signage and municipal ordinances determine formal permissions. Even when open, swimmers should be mindful of changing temperatures, sudden drop‑offs, boat traffic and the absence of lifeguards. Winter swimming is impractical and unsafe without specialized training and equipment because of ice cover and near‑freezing water temperatures.