Lake Walcott — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Walcott, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Walcott today is 18°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 18.7°C | 20.4°C | |
| SEP 15 | 19.2°C | 20.4°C | |
| SEP 16 | 18.5°C | 20.4°C | |
| SEP 17 | 18.0°C | 20.4°C | |
| SEP 18 | 18.1°C | 20.4°C | |
| SEP 19 | 19.0°C | 20.4°C | |
| SEP 20 | 18.7°C | 20.4°C | |
| SEP 21 | 18.0°C | 20.4°C | |
| SEP 22 | 20.4°C | 18.1°C | |
| SEP 23 | 20.4°C | 18.2°C | |
| SEP 24 | 20.4°C | 18.4°C | |
| SEP 25 | 20.4°C | 18.5°C | |
| SEP 26 | 20.4°C | 18.6°C | |
| SEP 27 | 20.4°C | 18.7°C | |
| SEP 28 | 20.4°C | 18.8°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 | 5°C |
| February | 1°C | 4°C | 6°C |
| March | 2°C | 6°C | 10°C |
| April | 5°C | 9°C | 13°C |
| May | 10°C | 14°C | 19°C |
| June | 15°C | 19°C | 22°C |
| July | 19°C | 23°C | 28°C |
| August | 20°C | 24°C | 29°C |
| September | 16°C | 20°C | 25°C |
| October | 9°C | 14°C | 19°C |
| November | 4°C | 8°C | 12°C |
| December | 0°C | 3°C | 7°C |
Lake Walcott: Water Temperature by Location
Lake Walcott: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake Walcott, a reservoir on the Snake River in southern Idaho, experiences a wide range of surface water temperatures through the year. In winter the surface often hovers near freezing, roughly 33–40°F (0.5–4°C). Spring brings a steady rise into the 40s and lower 60s°F (4–16°C) as inflows warm. Peak summer surface temperatures commonly reach about 60–75°F (16–24°C) on warm days, while early fall typically cools back into the 50s–60s°F (10–16°C). These values can vary with weather, wind, depth, and reservoir releases; deeper or shaded areas stay colder than shallow, sun-warmed shorelines.
Swimming is permitted at managed areas such as the designated swim beach within Lake Walcott State Park, which provides shoreline access and recreational amenities. The reservoir setting means there are few strong currents compared with a free-flowing river, but water can remain uncomfortably cool outside the warmest summer weeks, and sudden temperature changes at depth raise hypothermia risks. Visitors should swim only where allowed, be aware of boat traffic, and heed park advisories or closures; flotation devices and supervision are sensible precautions when water is chilly or conditions are busy.