Lake Nockamixon — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Nockamixon, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Nockamixon today is 21.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 3 | 18.4°C | 23.0°C | |
| JUN 4 | 19.4°C | 23.0°C | |
| JUN 5 | 20.0°C | 23.0°C | |
| JUN 6 | 20.3°C | 23.0°C | |
| JUN 7 | 21.0°C | 23.0°C | |
| JUN 8 | 21.0°C | 23.0°C | |
| JUN 11 | 23.0°C | 21.3°C | |
| JUN 12 | 23.0°C | 21.4°C | |
| JUN 13 | 23.0°C | 21.5°C | |
| JUN 14 | 23.0°C | 21.6°C | |
| JUN 15 | 23.0°C | 21.7°C | |
| JUN 16 | 23.0°C | 21.7°C | |
| JUN 17 | 23.0°C | 21.8°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 | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 6°C | 10°C |
| April | 9°C | 15°C | 20°C |
| May | 14°C | 18°C | 22°C |
| June | 16°C | 23°C | 30°C |
| July | 20°C | 27°C | 33°C |
| August | 22°C | 27°C | 31°C |
| September | 20°C | 23°C | 25°C |
| October | 12°C | 17°C | 21°C |
| November | 5°C | 9°C | 13°C |
| December | 1°C | 5°C | 7°C |
Lake Nockamixon: Water Temperature by Location
Lake Nockamixon: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
Lake Nockamixon’s surface water temperatures follow typical mid-Atlantic seasonal patterns. In winter (December–February) the lake often hovers around freezing to the low 40s °F (0–4 °C) and can form ice during prolonged cold spells. Spring (March–May) brings a steady rise, with surface readings generally in the 40s to low 60s °F (4–16 °C). By summer (June–August) the lake is warmest, commonly ranging from the upper 60s into the upper 70s °F (20–27 °C), though shallow bays may warm faster. In autumn (September–November) temperatures cool back through the 50s to upper 60s °F (10–20 °C) as air temperatures fall and mixing increases.
Swimming in Lake Nockamixon is not permitted under park regulations, so there are no lifeguarded beaches or official swimming areas. The restriction reflects a combination of safety and management concerns: boat traffic and personal watercraft use, variable undersea conditions and drop-offs, and the absence of staffed supervision increase risk to bathers. Visitors are instead directed to recreational boating, fishing, and shoreline picnicking where allowed. Those seeking open-water immersion should verify local rules and water conditions at alternative designated swimming sites with lifeguards and regular monitoring.