Harwoods Mill Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Harwoods Mill Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Harwoods Mill Reservoir today is 30.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 |
|---|---|---|---|
| JUL 14 | 26.9°C | 28.5°C | |
| JUL 15 | 28.7°C | 28.5°C | |
| JUL 16 | 29.0°C | 28.5°C | |
| JUL 17 | 29.0°C | 28.5°C | |
| JUL 18 | 28.8°C | 28.5°C | |
| JUL 19 | 28.9°C | 28.5°C | |
| JUL 20 | 29.1°C | 28.5°C | |
| JUL 21 | 30.1°C | 28.5°C | |
| JUL 22 | 28.5°C | 30.0°C | |
| JUL 23 | 28.5°C | 29.9°C | |
| JUL 24 | 28.5°C | 29.9°C | |
| JUL 25 | 28.5°C | 29.8°C | |
| JUL 26 | 28.5°C | 29.7°C | |
| JUL 27 | 28.5°C | 29.6°C | |
| JUL 28 | 28.5°C | 29.5°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 | 4°C | 7°C | 11°C |
| February | 1°C | 5°C | 8°C |
| March | 7°C | 11°C | 15°C |
| April | 11°C | 16°C | 22°C |
| May | 15°C | 20°C | 26°C |
| June | 18°C | 22°C | 26°C |
| July | 24°C | 29°C | 32°C |
| August | 24°C | 28°C | 31°C |
| September | 22°C | 26°C | 29°C |
| October | 16°C | 19°C | 22°C |
| November | 6°C | 11°C | 17°C |
| December | 6°C | 9°C | 12°C |
Harwoods Mill Reservoir: Water Temperature by Location
Harwoods Mill Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Harwoods Mill Reservoir, a municipal water supply impoundment in central Virginia, experiences typical mid-Atlantic seasonal surface temperatures. In winter the surface commonly drops into the mid-30s to mid-40s °F (about 2–7 °C). Spring brings a steady rise, with surface readings often in the mid-40s to mid-60s °F (roughly 7–18 °C) as the water column mixes. In summer, surface temperatures frequently reach the upper 70s into the low-to-mid 80s °F (around 25–29 °C), occasionally higher during prolonged heat spells. During fall the surface cools again, typically ranging from the low 50s to low 70s °F (about 10–21 °C). These figures are approximate and can vary with weather, wind, depth, and inflow conditions; deeper or shaded areas remain colder year-round.
Swimming in Harwoods Mill Reservoir is generally not permitted because the reservoir serves as a potable water source and authorities restrict direct-contact recreation to protect water quality and reservoir infrastructure. Restrictions also reflect safety concerns: there are no lifeguards, submerged hazards and sudden depth changes can exist, and cold-water conditions in shoulder seasons raise hypothermia risks. Recreational access is usually limited to managed activities approved by the water utility or county, so anyone interested in swimming should verify current local regulations before visiting.