Mantua Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Mantua Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Mantua Reservoir today is 13.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 5 | 13.6°C | 13.5°C | |
| OCT 6 | 12.7°C | 13.5°C | |
| OCT 7 | 13.0°C | 13.5°C | |
| OCT 8 | 13.0°C | 13.5°C | |
| OCT 9 | 13.0°C | 13.5°C | |
| OCT 10 | 12.8°C | 13.5°C | |
| OCT 11 | 12.6°C | 13.5°C | |
| OCT 12 | 14.0°C | 13.5°C | |
| OCT 13 | 13.5°C | 13.9°C | |
| OCT 14 | 13.5°C | 13.9°C | |
| OCT 15 | 13.5°C | 13.8°C | |
| OCT 16 | 13.5°C | 13.8°C | |
| OCT 17 | 13.5°C | 13.8°C | |
| OCT 18 | 13.5°C | 13.8°C | |
| OCT 19 | 13.5°C | 13.8°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 | 2°C | 5°C |
| February | 2°C | 4°C | 7°C |
| March | 3°C | 8°C | 13°C |
| April | 5°C | 9°C | 14°C |
| May | 7°C | 13°C | 20°C |
| June | 15°C | 21°C | 26°C |
| July | 20°C | 24°C | 28°C |
| August | 20°C | 24°C | 29°C |
| September | 17°C | 21°C | 26°C |
| October | 8°C | 14°C | 19°C |
| November | 3°C | 7°C | 11°C |
| December | 0°C | 2°C | 5°C |
Mantua Reservoir: Water Temperature by Location
Mantua Reservoir: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Mantua Reservoir (Lake of Mantua) sits in northern Utah and shows pronounced seasonal changes in surface temperature. In spring the water typically runs cold, roughly 40–60°F (4–16°C) as snowmelt and cool inflows dominate. Summer brings the warmest surface readings, commonly in the 60–75°F range (16–24°C) on sunny days, though deeper layers remain cooler. By fall the reservoir cools again to about 45–65°F (7–18°C) as air temperatures drop and turnover begins. In winter the surface approaches freezing, around 32°F (0°C), and portions of the lake may ice over depending on conditions.
Swimming is not formally provided with staffed beaches at Mantua Reservoir, but recreational swimming does occur, particularly in summer when surface temperatures are most comfortable. Because the lake is managed primarily for irrigation, fishing and boating, swimmers should be aware of fluctuating water levels, boat traffic, occasional algae or debris, and the absence of lifeguards. Cold pockets and swift temperature changes can pose hypothermia or cold-shock risks even in mid-summer. For safety and compliance, visitors should observe posted rules, avoid areas near inflow/outflow structures, and check current local advisories before entering the water.