Foss Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Foss Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Foss Reservoir today is 23.4°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 |
|---|---|---|---|
| SEP 14 | 24.6°C | 26.5°C | |
| SEP 15 | 25.0°C | 26.5°C | |
| SEP 16 | 24.9°C | 26.5°C | |
| SEP 17 | 24.4°C | 26.5°C | |
| SEP 18 | 24.0°C | 26.5°C | |
| SEP 19 | 23.8°C | 26.5°C | |
| SEP 20 | 23.6°C | 26.5°C | |
| SEP 21 | 23.4°C | 26.5°C | |
| SEP 22 | 26.5°C | 23.6°C | |
| SEP 23 | 26.5°C | 23.7°C | |
| SEP 24 | 26.5°C | 23.9°C | |
| SEP 25 | 26.5°C | 24.0°C | |
| SEP 26 | 26.5°C | 24.2°C | |
| SEP 27 | 26.5°C | 24.3°C | |
| SEP 28 | 26.5°C | 24.5°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 | 3°C | 7°C | 10°C |
| March | 3°C | 11°C | 19°C |
| April | 10°C | 16°C | 22°C |
| May | 13°C | 19°C | 26°C |
| June | 20°C | 26°C | 32°C |
| July | 24°C | 27°C | 31°C |
| August | 23°C | 28°C | 33°C |
| September | 22°C | 27°C | 31°C |
| October | 16°C | 20°C | 23°C |
| November | 10°C | 15°C | 19°C |
| December | 6°C | 9°C | 13°C |
Foss Reservoir: Water Temperature by Location
Foss Reservoir: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Foss Reservoir, often called Lake Foss in western Oklahoma, experiences a wide range of surface water temperatures through the year. In summer months the surface commonly warms to roughly 80–90°F (27–32°C) on sunny, hot days, while spring and fall typically see more moderate values around 50–75°F (10–24°C). Winter surface temperatures frequently fall into the 35–50°F (2–10°C) range, and deeper water remains noticeably cooler year‑round—often 10–15°F (5–8°C) colder than the surface when the lake is stratified. These ranges can vary with recent weather, inflow, and wind-driven mixing, and extreme heat or cold will shift them toward the upper or lower ends of the ranges.
Swimming and casual wading are commonly practiced at Foss Reservoir, but the lake does not generally feature lifeguarded public beaches or extensive swim facilities, so visitors should treat it as an unmanaged recreational waterbody. Authorities typically allow swimming because the reservoir supports boating, fishing and other public recreation, but safety and water‑quality considerations matter: currents near the dam, submerged hazards, variable depths, and occasional algal blooms or advisories can restrict safe use. It is prudent to check local notices and exercise standard open‑water precautions when entering the water.