Lake De Smet — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake De Smet, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake De Smet today is 18.2°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 | 19.5°C | 18.5°C | |
| SEP 15 | 19.6°C | 18.5°C | |
| SEP 16 | 20.4°C | 18.5°C | |
| SEP 17 | 19.5°C | 18.5°C | |
| SEP 18 | 18.7°C | 18.5°C | |
| SEP 19 | 17.8°C | 18.5°C | |
| SEP 20 | 19.0°C | 18.5°C | |
| SEP 21 | 18.2°C | 18.5°C | |
| SEP 22 | 18.5°C | 18.2°C | |
| SEP 23 | 18.5°C | 18.2°C | |
| SEP 24 | 18.5°C | 18.2°C | |
| SEP 25 | 18.5°C | 18.3°C | |
| SEP 26 | 18.5°C | 18.3°C | |
| SEP 27 | 18.5°C | 18.3°C | |
| SEP 28 | 18.5°C | 18.3°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 | 5°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 4°C | 8°C |
| April | 0°C | 6°C | 12°C |
| May | 4°C | 11°C | 18°C |
| June | 11°C | 16°C | 20°C |
| July | 16°C | 21°C | 27°C |
| August | 18°C | 23°C | 28°C |
| September | 14°C | 19°C | 23°C |
| October | 7°C | 13°C | 18°C |
| November | 3°C | 6°C | 9°C |
| December | 1°C | 4°C | 7°C |
Lake De Smet: Water Temperature by Location
Lake De Smet: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake De Smet in northeastern Wyoming experiences a wide annual range of surface water temperatures driven by elevation, exposure and weather. In spring (April–May) surface waters commonly sit around 40–55°F (4–13°C) as ice melts and the lake stratifies. Summer highs, usually in July and August, often reach roughly 60–75°F (16–24°C) on the surface on warm days, though cooler temperatures persist below the thermocline. By fall (September–October) values typically decline to about 45–60°F (7–16°C). In winter the lake can approach freezing, with surface temperatures near 32–40°F (0–4°C) and periodic ice cover. Short-term weather swings and wind can produce rapid changes, and deeper water remains noticeably colder year-round.
Swimming at Lake De Smet is generally possible in warmer months where public access exists, but conditions and local rules determine specific allowances. Many people swim there in summer when surface temperatures are most comfortable, but there are no widespread lifeguarded beaches and shoreline ownership varies, so visitors should obey posted signs and county regulations. Cold water even in summer, sudden drop-offs, boat traffic and the potential for hypothermia make caution advisable. In winter, ice and near-freezing water render open-water swimming unsafe and typically prohibited.