Merrill Creek Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Merrill Creek Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Merrill Creek Reservoir today is 25.9°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 |
|---|---|---|---|
| JUL 14 | 22.1°C | 26.0°C | |
| JUL 15 | 26.5°C | 26.0°C | |
| JUL 16 | 26.5°C | 26.0°C | |
| JUL 17 | 27.8°C | 26.0°C | |
| JUL 18 | 27.8°C | 26.0°C | |
| JUL 19 | 27.4°C | 26.0°C | |
| JUL 20 | 27.4°C | 26.0°C | |
| JUL 21 | 26.6°C | 26.0°C | |
| JUL 22 | 26.0°C | 25.9°C | |
| JUL 23 | 26.0°C | 25.9°C | |
| JUL 24 | 26.0°C | 25.9°C | |
| JUL 25 | 26.0°C | 25.9°C | |
| JUL 26 | 26.0°C | 25.9°C | |
| JUL 27 | 26.0°C | 25.9°C | |
| JUL 28 | 26.0°C | 25.9°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 | 0°C | 4°C | 8°C |
| April | 8°C | 14°C | 20°C |
| May | 13°C | 18°C | 22°C |
| June | 16°C | 23°C | 30°C |
| July | 19°C | 26°C | 33°C |
| August | 21°C | 26°C | 31°C |
| September | 19°C | 22°C | 25°C |
| October | 11°C | 16°C | 20°C |
| November | 5°C | 8°C | 11°C |
| December | 1°C | 4°C | 7°C |
Merrill Creek Reservoir: Water Temperature by Location
Merrill Creek Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
Location & Local Information
Merrill Creek Reservoir experiences a clear seasonal pattern in surface water temperatures. In winter the water often sits just above freezing, commonly around 33–40°F (1–4°C). Spring brings gradual warming, with surface readings typically between 40–60°F (4–15°C) as stratification begins. By late spring and early summer the reservoir commonly reaches 65–75°F (18–24°C), and during warm spells surface temperatures can climb into the 80–85°F range (27–29°C) on the hottest days. Through autumn the water cools back into the 50–65°F band (10–18°C) as turnover occurs. Deeper water remains substantially colder year-round, so overall conditions can change quickly with weather, winds and depth.
Swimming at Merrill Creek Reservoir is generally not permitted; reservoirs managed for water supply or ecological reasons often restrict bathing to protect drinking-water quality and to reduce safety risks. In addition to regulatory considerations, hazards such as cold hypothermia risk, sudden drop-offs, submerged structure, and the lack of lifeguard services make unsupervised swimming unsafe. Visitors seeking water recreation typically use designated boating or fishing areas where rules allow non-contact activities under specific conditions, while swimming is discouraged or prohibited to safeguard public health and reservoir operations.