Jordanelle Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Jordanelle Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Jordanelle Reservoir today is 18°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 |
|---|---|---|---|
| SEP 14 | 16.2°C | 19.2°C | |
| SEP 15 | 17.6°C | 19.2°C | |
| SEP 16 | 17.6°C | 19.2°C | |
| SEP 17 | 17.8°C | 19.2°C | |
| SEP 18 | 17.6°C | 19.2°C | |
| SEP 19 | 17.4°C | 19.2°C | |
| SEP 20 | 17.8°C | 19.2°C | |
| SEP 22 | 19.2°C | 18.1°C | |
| SEP 23 | 19.2°C | 18.1°C | |
| SEP 24 | 19.2°C | 18.2°C | |
| SEP 25 | 19.2°C | 18.2°C | |
| SEP 26 | 19.2°C | 18.3°C | |
| SEP 27 | 19.2°C | 18.4°C | |
| SEP 28 | 19.2°C | 18.4°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 | 2°C | 5°C |
| February | 1°C | 4°C | 6°C |
| March | 1°C | 6°C | 11°C |
| April | 0°C | 6°C | 11°C |
| May | 5°C | 12°C | 19°C |
| June | 13°C | 17°C | 21°C |
| July | 18°C | 22°C | 26°C |
| August | 19°C | 23°C | 27°C |
| September | 15°C | 19°C | 24°C |
| October | 8°C | 13°C | 17°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 3°C | 6°C |
Jordanelle Reservoir: Water Temperature by Location
Jordanelle Reservoir: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Jordanelle Reservoir is a high-elevation, mountain-fed body of water, so its temperatures stay relatively cool compared with lower-elevation lakes. Typical surface temperatures vary by season: in spring (April–May) the surface often ranges from about 40–55°F (4–13°C) as snowmelt and runoff dominate; in summer (June–August) surface readings commonly reach roughly 60–75°F (15–24°C) on warm afternoons; in fall (September–October) temperatures generally fall back to around 45–60°F (7–16°C); and in winter the surface can approach freezing, roughly 32–39°F (0–4°C), with ice formation possible in cold spells. Deeper water stays markedly colder year-round, and sudden weather changes can drop surface temperatures quickly.
Swimming is permitted in areas of Jordanelle State Park and the reservoir is used for recreational swimming during the warmer months because the park is managed for multiple forms of water recreation. That said, swimmers should be aware of the lake’s cool temperatures, variable water levels, boat traffic, and possible drop-offs, all of which affect safety. Cold water can increase the risk of hypothermia even in summer, and many areas do not have lifeguards, so users are advised to swim in designated zones, use flotation if appropriate, and exercise caution.