Lyman Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lyman Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lyman Reservoir today is 17.4°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 |
|---|---|---|---|
| OCT 16 | 18.0°C | 17.5°C | |
| OCT 17 | 17.7°C | 17.5°C | |
| OCT 18 | 17.4°C | 17.5°C | |
| OCT 19 | 17.9°C | 17.5°C | |
| OCT 20 | 17.9°C | 17.5°C | |
| OCT 21 | 17.0°C | 17.5°C | |
| OCT 22 | 16.1°C | 17.5°C | |
| OCT 24 | 17.5°C | 17.4°C | |
| OCT 25 | 17.5°C | 17.4°C | |
| OCT 25 | 17.5°C | 17.4°C | |
| OCT 26 | 17.5°C | 17.4°C | |
| OCT 27 | 17.5°C | 17.4°C | |
| OCT 28 | 17.5°C | 17.4°C | |
| OCT 29 | 17.5°C | 17.4°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 | 9°C |
| February | 2°C | 6°C | 10°C |
| March | 6°C | 13°C | 21°C |
| April | 11°C | 15°C | 19°C |
| May | 16°C | 20°C | 23°C |
| June | 19°C | 24°C | 29°C |
| July | 24°C | 27°C | 30°C |
| August | 23°C | 27°C | 31°C |
| September | 20°C | 24°C | 28°C |
| October | 14°C | 18°C | 21°C |
| November | 6°C | 11°C | 16°C |
| December | 5°C | 4°C | 10°C |
Lyman Reservoir: Water Temperature by Location
Lyman Reservoir: Weather Forecast
October 23
October 24
October 25
October 26
October 27
October 28
Location & Local Information
Lyman Reservoir, which is the centerpiece of Lyman Lake State Park in eastern Arizona, sits at a relatively high elevation of nearly 6,000 feet. This elevation moderates the extreme desert heat, but the water still experiences a distinct seasonal temperature cycle. During the peak summer months, surface water temperatures generally become comfortable for water sports and swimming, often reaching an average of around 27∘C to 31∘C (80∘F to 88∘F). In the winter, the lake cools substantially, with temperatures likely dropping to the range of 4∘C to 11∘C (40∘F to 52∘F), making the water too cold for recreational swimming.
Swimming is generally permitted and encouraged at Lyman Lake, as it is managed by Arizona State Parks as an all-water-sports lake. The park specifically mentions swimming as a popular summer activity. Unlike some other Arizona lakes, Lyman has no size restrictions on boats, which means boat traffic, including water-skiers and powerboats, is common. The State Park explicitly states that there is no lifeguard on duty, meaning all swimming is at your own risk. Swimmers are advised to be cautious of the rocky shoreline, use comfortable foot cover, and be aware of the colder water temperatures that can occur outside of the shallows, especially in the spring and fall.