Occoquan Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Occoquan Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Occoquan Reservoir today is 26.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| AUG 24 | 26.6°C | 26.5°C | |
| AUG 25 | 26.5°C | 26.5°C | |
| AUG 26 | 26.5°C | 26.5°C | |
| AUG 27 | 26.5°C | 26.5°C | |
| AUG 28 | 25.7°C | 26.5°C | |
| AUG 29 | 25.8°C | 26.5°C | |
| AUG 30 | 25.7°C | 26.5°C | |
| AUG 31 | 26.1°C | 26.5°C | |
| SEP 1 | 24.0°C | 26.2°C | |
| SEP 2 | 24.0°C | 26.1°C | |
| SEP 3 | 24.0°C | 26.0°C | |
| SEP 4 | 24.0°C | 25.8°C | |
| SEP 5 | 24.0°C | 25.7°C | |
| SEP 6 | 24.0°C | 25.6°C | |
| SEP 7 | 24.0°C | 25.5°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 | 1°C | 4°C | 8°C |
| February | 0°C | 4°C | 7°C |
| March | 2°C | 8°C | 14°C |
| April | 10°C | 15°C | 20°C |
| May | 15°C | 20°C | 25°C |
| June | 18°C | 22°C | 26°C |
| July | 24°C | 27°C | 30°C |
| August | 21°C | 27°C | 32°C |
| September | 21°C | 24°C | 27°C |
| October | 14°C | 18°C | 22°C |
| November | 8°C | 12°C | 16°C |
| December | 4°C | 6°C | 9°C |
Occoquan Reservoir: Water Temperature by Location
Occoquan Reservoir: Weather Forecast
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Location & Local Information
Surface water temperatures in the Occoquan Reservoir vary through the year in line with Virginia’s seasons. In winter the surface typically cools to roughly 35–45°F (about 2–7°C). During spring it warms to around 45–65°F (7–18°C) as air temperatures rise and stratification begins to break down. Peak summertime surface readings commonly fall in the 70–85°F range (21–29°C), with occasional hotter spikes during heat waves; deeper water remains noticeably cooler. In autumn the reservoir cools again, with surface temperatures generally sliding back through roughly 55–70°F (13–21°C) as the lake mixes and loses summer heat. These figures are approximate and can shift with weather, wind, inflow, and depth.
Swimming in the Occoquan Reservoir is generally not allowed because the reservoir is part of the regional potable water supply; restrictions are intended to protect water quality and public health and to reduce safety risks in a working reservoir with variable depths and boat traffic. Recreational activities such as boating and fishing may be permitted in designated areas under local regulations, but direct water contact like swimming is restricted to minimize contamination and ensure safe drinking-water operations. If considering any water activity there, check current local rules and posted notices before visiting.