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 19.5°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 |
|---|---|---|---|
| JUN 23 | 20.0°C | 18.1°C | |
| JUN 24 | 21.2°C | 18.1°C | |
| JUN 25 | 21.3°C | 18.1°C | |
| JUN 26 | 21.2°C | 18.1°C | |
| JUN 27 | 20.3°C | 18.1°C | |
| JUN 28 | 20.6°C | 18.1°C | |
| JUN 29 | 19.4°C | 18.1°C | |
| JUN 30 | 19.5°C | 18.1°C | |
| JUL 1 | 21.0°C | 19.6°C | |
| JUL 2 | 21.0°C | 19.7°C | |
| JUL 3 | 21.0°C | 19.7°C | |
| JUL 4 | 21.0°C | 19.8°C | |
| JUL 5 | 21.0°C | 19.9°C | |
| JUL 6 | 21.0°C | 20.0°C | |
| JUL 7 | 21.0°C | 20.0°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 | 18°C | 21°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
July 1
July 2
July 3
July 4
July 5
July 6
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.