Greenbelt Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Greenbelt Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Greenbelt Reservoir today is 29°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 | 27.4°C | 25.4°C | |
| JUL 15 | 29.7°C | 25.4°C | |
| JUL 16 | 29.6°C | 25.4°C | |
| JUL 17 | 29.4°C | 25.4°C | |
| JUL 18 | 29.4°C | 25.4°C | |
| JUL 19 | 29.4°C | 25.4°C | |
| JUL 20 | 29.4°C | 25.4°C | |
| JUL 21 | 29.0°C | 25.4°C | |
| JUL 22 | 25.4°C | 28.8°C | |
| JUL 23 | 25.4°C | 28.6°C | |
| JUL 24 | 25.4°C | 28.5°C | |
| JUL 25 | 25.4°C | 28.3°C | |
| JUL 26 | 25.4°C | 28.1°C | |
| JUL 27 | 25.4°C | 27.9°C | |
| JUL 28 | 25.4°C | 27.7°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 | 6°C | 11°C |
| February | 1°C | 5°C | 10°C |
| March | 1°C | 8°C | 15°C |
| April | 9°C | 15°C | 21°C |
| May | 14°C | 20°C | 25°C |
| June | 18°C | 23°C | 29°C |
| July | 21°C | 25°C | 30°C |
| August | 22°C | 24°C | 27°C |
| September | 19°C | 23°C | 26°C |
| October | 15°C | 20°C | 24°C |
| November | 8°C | 14°C | 20°C |
| December | 6°C | 9°C | 12°C |
Greenbelt Reservoir: Water Temperature by Location
Greenbelt Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Greenbelt Reservoir in Texas experiences a wide seasonal swing in surface water temperatures. In summer months surface water commonly warms to roughly 80–90°F (27–32°C) and can briefly reach the low 90s°F (around 33–35°C) during heat waves. Spring and fall are transitional, with surface temperatures typically in the 60–80°F range (16–27°C). Winters bring the coolest conditions, with surface readings often falling to about 45–60°F (7–16°C). Like most reservoirs, Greenbelt stratifies in summer so deeper water remains noticeably cooler than the surface; temperatures vary with depth, season, and recent weather, so these ranges are approximate rather than fixed.
Swimming at Greenbelt Reservoir is generally allowed in designated public or park-managed areas but can be subject to local regulations and safety advisories. Managers may restrict swimming when water quality tests indicate elevated bacteria or harmful algal blooms, or when boating traffic or hazardous submerged structures present risks. Some areas provide marked swim zones and seasonal lifeguards while others allow only unguided entry, so visitors should observe on-site signage and current advisories. For comfort and safety, swimmers should consider the season, surface temperature, and any posted health or hazard notices before entering the water.