Monticello Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Monticello Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Monticello Reservoir today is 22.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| OCT 10 | 23.2°C | 23.0°C | |
| OCT 11 | 23.2°C | 23.0°C | |
| OCT 12 | 22.5°C | 23.0°C | |
| OCT 13 | 22.5°C | 23.0°C | |
| OCT 14 | 22.6°C | 23.0°C | |
| OCT 15 | 22.8°C | 23.0°C | |
| OCT 16 | 21.7°C | 23.0°C | |
| OCT 17 | 22.2°C | 23.0°C | |
| OCT 18 | 23.0°C | 22.2°C | |
| OCT 19 | 23.0°C | 22.3°C | |
| OCT 20 | 23.0°C | 22.3°C | |
| OCT 21 | 23.0°C | 22.4°C | |
| OCT 22 | 23.0°C | 22.4°C | |
| OCT 23 | 23.0°C | 22.4°C | |
| OCT 24 | 23.0°C | 22.5°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 | 6°C | 10°C | 15°C |
| February | 5°C | 11°C | 16°C |
| March | 8°C | 14°C | 20°C |
| April | 14°C | 18°C | 23°C |
| May | 17°C | 22°C | 26°C |
| June | 18°C | 25°C | 32°C |
| July | 22°C | 25°C | 29°C |
| August | 24°C | 29°C | 34°C |
| September | 23°C | 28°C | 32°C |
| October | 18°C | 23°C | 28°C |
| November | 12°C | 16°C | 20°C |
| December | 9°C | 12°C | 16°C |
Monticello Reservoir: Water Temperature by Location
Monticello Reservoir: Weather Forecast
October 18
October 19
October 20
October 21
October 22
October 23
Location & Local Information
Monticello Reservoir’s surface temperatures follow the typical seasonal pattern of inland South Carolina lakes. In summer months you can expect surface water commonly in the mid-70s to mid-80s °F (about 24–29 °C), while late spring and early fall usually see temperatures around 55–75 °F (13–24 °C). Winter surface readings often drop into the 40s–50s °F (4–13 °C). Deeper water remains noticeably colder year-round and thermoclines can form in warm months, so water temperature can vary significantly with depth and weather conditions. Warm spells and shallow, sunlit coves will warm fastest; cold fronts and strong winds can lower surface temperatures quickly.
Swimming opportunities at Monticello Reservoir depend on access and local management rather than a blanket prohibition. Where the shoreline is publicly accessible and the reservoir is managed for recreation, people commonly swim in summer, but there are often no lifeguards and conditions are unguarded. If the reservoir is designated as a potable-water source or is on private land, swimming may be restricted to protect water quality or for liability reasons. Visitors should heed posted signs, watch for harmful algal blooms or debris, and follow local rules; swimming is therefore possible in warm months where permitted, but always at your own risk and subject to management restrictions.