Coos Bay — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Coos Bay, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Coos Bay today is 24.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 4 | 23.9°C | 20.2°C | |
| AUG 5 | 24.3°C | 20.2°C | |
| AUG 6 | 24.1°C | 20.2°C | |
| AUG 7 | 24.4°C | 20.2°C | |
| AUG 8 | 24.5°C | 20.2°C | |
| AUG 9 | 24.7°C | 20.2°C | |
| AUG 10 | 24.5°C | 20.2°C | |
| AUG 11 | 24.3°C | 20.2°C | |
| AUG 12 | 20.2°C | 24.1°C | |
| AUG 13 | 20.2°C | 23.9°C | |
| AUG 14 | 20.2°C | 23.7°C | |
| AUG 15 | 20.2°C | 23.5°C | |
| AUG 16 | 20.2°C | 23.3°C | |
| AUG 17 | 20.2°C | 23.1°C | |
| AUG 18 | 20.2°C | 22.9°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 | 4°C | 8°C | 11°C |
| February | 4°C | 8°C | 11°C |
| March | 2°C | 7°C | 13°C |
| April | 8°C | 13°C | 17°C |
| May | 9°C | 13°C | 18°C |
| June | 15°C | 18°C | 22°C |
| July | 18°C | 21°C | 24°C |
| August | 16°C | 20°C | 25°C |
| September | 16°C | 18°C | 21°C |
| October | 12°C | 16°C | 20°C |
| November | 8°C | 13°C | 16°C |
| December | 7°C | 11°C | 14°C |
Coos Bay: Water Temperature by Location
Coos Bay: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Coos Bay itself is an estuarine harbor on the southern Oregon coast rather than a true lake, but water temperatures for the bay and nearby coastal lakes are generally cool year‑round. Surface temperatures typically sit in the mid‑40s to low‑50s °F (around 7–10 °C) in winter and rise to roughly the mid‑50s to mid‑60s °F (about 13–18 °C) in summer. Shallow inland ponds or small lakes in the Coos Bay area can warm further on hot summer days, sometimes reaching the upper 60s to around 70 °F (18–21 °C) in isolated spots, but deeper or tidally influenced waters remain substantially cooler.
Swimming is allowed in many public beaches and some designated freshwater sites, but conditions dictate whether it’s advisable. Cold temperatures limit safe immersion time and increase hypothermia risk, and the estuary has currents, tides and boat traffic that can make open‑water swimming hazardous. Local health or park authorities may post advisories for water quality after heavy rain or algal bloom concerns, so swimmers often choose summer days, protected areas, or use wetsuits and flotation for longer swims.