Lake Nacimiento — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Nacimiento, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Nacimiento today is 19.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 26 | 20.8°C | 24.0°C | |
| OCT 27 | 21.1°C | 24.0°C | |
| OCT 28 | 20.7°C | 24.0°C | |
| OCT 29 | 20.7°C | 24.0°C | |
| OCT 30 | 19.9°C | 24.0°C | |
| OCT 31 | 19.8°C | 24.0°C | |
| NOV 1 | 19.6°C | 17.8°C | |
| NOV 2 | 19.5°C | 17.8°C | |
| NOV 3 | 17.8°C | 19.1°C | |
| NOV 4 | 17.8°C | 19.1°C | |
| NOV 5 | 17.8°C | 19.0°C | |
| NOV 6 | 17.8°C | 18.9°C | |
| NOV 7 | 17.8°C | 18.9°C | |
| NOV 8 | 17.8°C | 18.8°C | |
| NOV 9 | 17.8°C | 18.7°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 | 9°C | 11°C | 14°C |
| February | 10°C | 12°C | 15°C |
| March | 8°C | 14°C | 21°C |
| April | 15°C | 18°C | 20°C |
| May | 16°C | 21°C | 25°C |
| June | 21°C | 24°C | 27°C |
| July | 20°C | 24°C | 29°C |
| August | 23°C | 26°C | 30°C |
| September | 20°C | 23°C | 27°C |
| October | 20°C | 24°C | 28°C |
| November | 13°C | 18°C | 22°C |
| December | 11°C | 15°C | 18°C |
Lake Nacimiento: Water Temperature by Location
Lake Nacimiento: Weather Forecast
November 3
November 4
November 5
November 6
November 7
Location & Local Information
Lake Nacimiento’s surface water temperatures vary considerably through the year and by depth. In summer months (June–August) surface readings commonly range from about 68–80 °F (20–27 °C), making many shallow bays pleasantly warm for swimming. During spring (March–May) temperatures are cooler, often around 50–65 °F (10–18 °C) as snowmelt and inflow keep the reservoir chilly. Fall (September–November) typically sees a gradual cooling with surface temps of roughly 60–72 °F (16–22 °C), while winter (December–February) surface conditions usually sit near 45–55 °F (7–13 °C). Because Nacimiento is a reservoir, deeper water stays colder year-round and localized conditions can shift with weather, drought, and releases from the dam.
Swimming is permitted at Lake Nacimiento in many recreation areas and shoreline spots, but it is not universally regulated like a staffed public beach. That means swimming is allowed in designated park and marina areas, yet there are often no lifeguards and much of the lake is shared with motorboats, personal watercraft, and fishing activity. For those reasons, swimmers should choose calm, clearly designated swimming areas, be aware of colder temperatures that increase risk of hypothermia, and practice standard water-safety precautions when entering the lake.