Coeur d'Alene Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Coeur d'Alene Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Coeur d'Alene Lake today is 18.6°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 |
|---|---|---|---|
| JUL 1 | 17.7°C | 20.8°C | |
| JUL 2 | 17.5°C | 20.8°C | |
| JUL 3 | 17.6°C | 20.8°C | |
| JUL 4 | 17.6°C | 20.8°C | |
| JUL 5 | 18.1°C | 20.8°C | |
| JUL 6 | 18.1°C | 20.8°C | |
| JUL 7 | 18.5°C | 20.8°C | |
| JUL 8 | 18.6°C | 20.8°C | |
| JUL 9 | 20.8°C | 18.7°C | |
| JUL 10 | 20.8°C | 18.8°C | |
| JUL 11 | 20.8°C | 18.9°C | |
| JUL 12 | 20.8°C | 19.0°C | |
| JUL 13 | 20.8°C | 19.2°C | |
| JUL 14 | 20.8°C | 19.3°C | |
| JUL 15 | 20.8°C | 19.4°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 | 0°C | 2°C | 4°C |
| February | 0°C | 3°C | 5°C |
| March | 0°C | 4°C | 8°C |
| April | 2°C | 7°C | 12°C |
| May | 6°C | 11°C | 17°C |
| June | 13°C | 17°C | 20°C |
| July | 17°C | 21°C | 24°C |
| August | 20°C | 23°C | 25°C |
| September | 16°C | 20°C | 23°C |
| October | 10°C | 15°C | 19°C |
| November | 5°C | 9°C | 13°C |
| December | 1°C | 3°C | 6°C |
Coeur d'Alene Lake: Water Temperature by Location
Coeur d'Alene Lake: Weather Forecast
July 9
July 10
July 11
July 12
Location & Local Information
Coeur d'Alene Lake in northern Idaho is a clear, glacier- and snowmelt-fed body of water whose surface temperatures vary noticeably through the year. In spring the lake is brisk, often ranging from about 40–60°F (4–16°C) as runoff and cool nights keep it chilly. By summer, especially in July and August, nearshore temperatures commonly warm to roughly 60–75°F (16–24°C), with the warmest readings in shallow bays on sunny days. Fall brings cooling waters back toward about 45–60°F (7–16°C) as air temperatures drop, and in winter the surface can sit near freezing to the low 40s°F, roughly 32–45°F (0–7°C), depending on weather and ice presence in sheltered coves.
Swimming in Coeur d’Alene Lake is permitted and popular in the warmer months because public beaches and parks provide access and generally acceptable water quality. Opportunities for safe swimming are best in late summer when surface temperatures are highest; earlier or later in the season the cold water increases hypothermia risk and may require a wetsuit or short swims. Visitors should also account for boat traffic, steep drop-offs in some areas, and local advisories about water quality or algal conditions when choosing where and when to swim.