Shasta Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Shasta Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Shasta Lake today is 30°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 |
|---|---|---|---|
| AUG 8 | 28.7°C | 26.1°C | |
| AUG 9 | 28.8°C | 26.1°C | |
| AUG 10 | 28.9°C | 26.1°C | |
| AUG 11 | 29.2°C | 26.1°C | |
| AUG 12 | 29.3°C | 26.1°C | |
| AUG 13 | 29.1°C | 26.1°C | |
| AUG 14 | 29.1°C | 26.1°C | |
| AUG 15 | 30.3°C | 26.1°C | |
| AUG 16 | 26.1°C | 29.8°C | |
| AUG 17 | 26.1°C | 29.6°C | |
| AUG 18 | 26.1°C | 29.4°C | |
| AUG 19 | 26.1°C | 29.2°C | |
| AUG 20 | 26.1°C | 29.0°C | |
| AUG 21 | 26.1°C | 28.8°C | |
| AUG 22 | 26.1°C | 28.6°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 | 5°C | 8°C | 12°C |
| February | 6°C | 9°C | 11°C |
| March | 5°C | 11°C | 17°C |
| April | 9°C | 13°C | 17°C |
| May | 13°C | 18°C | 22°C |
| June | 18°C | 22°C | 26°C |
| July | 22°C | 26°C | 30°C |
| August | 22°C | 26°C | 31°C |
| September | 20°C | 24°C | 27°C |
| October | 14°C | 18°C | 22°C |
| November | 11°C | 15°C | 19°C |
| December | 6°C | 9°C | 12°C |
Shasta Lake: Water Temperature by Location
Shasta Lake: Weather Forecast
August 16
August 17
August 18
August 19
August 20
August 21
Location & Local Information
Shasta Lake is a large reservoir in northern California whose surface water temperatures shift substantially with the seasons and with depth. In winter the surface is typically cool, often about 40–55°F (4–13°C). Spring brings gradual warming to roughly 50–65°F (10–18°C). Peak summer surface readings commonly reach about 68–78°F (20–26°C), and in shallow, sheltered coves can occasionally climb toward the low 80s°F (around 27–28°C) on very hot days. In autumn the surface usually cools back into the 60s–70s°F range (16–21°C). Because Shasta is a deep reservoir, deeper water remains much colder year‑round due to thermal stratification, so temperatures can drop sharply below the surface.
Swimming is allowed at Shasta Lake because it is managed for recreation, and many marinas, campgrounds, and shoreline areas are used for bathing and wading. However, swimmers should be cautious: cold water and sudden temperature changes can cause cold‑water shock or hypothermia, boating traffic and submerged hazards create safety risks, and many shore sites do not have lifeguards. Water quality and local conditions (such as algae blooms or fluctuating levels) also vary, so checking current advisories and using flotation devices, swimming near shore, and practicing boat‑aware behavior are recommended.