Johnson Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Johnson Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Johnson Lake today is 25.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 |
|---|---|---|---|
| AUG 24 | 25.2°C | 26.7°C | |
| AUG 25 | 25.1°C | 26.7°C | |
| AUG 26 | 25.1°C | 26.7°C | |
| AUG 27 | 25.1°C | 26.7°C | |
| AUG 28 | 25.1°C | 26.7°C | |
| AUG 29 | 25.1°C | 26.7°C | |
| AUG 30 | 25.2°C | 26.7°C | |
| AUG 31 | 25.0°C | 26.7°C | |
| SEP 1 | 23.0°C | 25.5°C | |
| SEP 2 | 23.0°C | 25.3°C | |
| SEP 3 | 23.0°C | 25.2°C | |
| SEP 4 | 23.0°C | 25.1°C | |
| SEP 5 | 23.0°C | 25.0°C | |
| SEP 6 | 23.0°C | 24.8°C | |
| SEP 7 | 23.0°C | 24.7°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 | 1°C | 4°C | 6°C |
| February | 1°C | 5°C | 9°C |
| March | 2°C | 9°C | 16°C |
| April | 8°C | 14°C | 19°C |
| May | 14°C | 18°C | 21°C |
| June | 18°C | 22°C | 26°C |
| July | 22°C | 26°C | 30°C |
| August | 24°C | 27°C | 29°C |
| September | 20°C | 23°C | 26°C |
| October | 11°C | 16°C | 21°C |
| November | 5°C | 11°C | 15°C |
| December | 0°C | 3°C | 6°C |
Johnson Lake: Water Temperature by Location
Johnson Lake: Weather Forecast
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Location & Local Information
Johnson Lake in Nebraska typically follows the seasonal temperature patterns of shallow prairie reservoirs. In spring the surface water commonly warms from near-freezing after ice-out to roughly 45–65°F (7–18°C) as air temperatures rise. Summer surface temperatures often reach their peak, commonly ranging from about 70–80°F (21–27°C) on warm days, although shallow bays can exceed that briefly. Early fall sees a gradual cooling back into the 55–70°F (13–21°C) range, and by late fall and winter the lake approaches near-freezing conditions around 32–35°F (0–2°C), with ice cover possible during prolonged cold spells.
Swimming is generally permitted at public lakes like Johnson Lake because the area is managed for multiple recreational uses, including boating and shore activities, but permissions and conditions can vary by season and local rules. There are often no lifeguards on duty, and occasional advisories for water quality, low water levels, or hazardous conditions may temporarily restrict swimming. Because surface temperatures can drop quickly outside midsummer, swimmers should be cautious about cold-water risks such as hypothermia and be attentive to posted signs and local guidance before entering the water.