Bumping Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bumping Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bumping Lake today is 14.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| SEP 14 | 16.1°C | 20.5°C | |
| SEP 15 | 16.4°C | 20.5°C | |
| SEP 16 | 16.1°C | 20.5°C | |
| SEP 17 | 15.4°C | 20.5°C | |
| SEP 18 | 14.4°C | 20.5°C | |
| SEP 19 | 15.0°C | 20.5°C | |
| SEP 20 | 14.9°C | 20.5°C | |
| SEP 21 | 14.7°C | 20.5°C | |
| SEP 22 | 20.5°C | 15.0°C | |
| SEP 23 | 20.5°C | 15.3°C | |
| SEP 24 | 20.5°C | 15.6°C | |
| SEP 25 | 20.5°C | 15.9°C | |
| SEP 26 | 20.5°C | 16.2°C | |
| SEP 27 | 20.5°C | 16.4°C | |
| SEP 28 | 20.5°C | 16.7°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 | 0°C | 2°C | 4°C |
| February | 0°C | 4°C | 8°C |
| March | 0°C | 6°C | 11°C |
| April | 2°C | 9°C | 15°C |
| May | 6°C | 14°C | 21°C |
| June | 9°C | 17°C | 24°C |
| July | 13°C | 22°C | 31°C |
| August | 15°C | 23°C | 30°C |
| September | 15°C | 21°C | 26°C |
| October | 8°C | 14°C | 20°C |
| November | 1°C | 8°C | 14°C |
| December | 0°C | 4°C | 6°C |
Bumping Lake: Water Temperature by Location
Bumping Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Bumping Lake is a high-elevation reservoir in the Washington Cascades, so its water tends to be cool for most of the year. Typical surface temperatures in spring (May–June) range from roughly 40–55°F (4–13°C) as snowmelt and runoff cool the lake. In the warmest part of summer (July–August) surface readings commonly reach about 55–68°F (13–20°C), and on rare hot, calm days parts of the surface can approach 70°F (21°C). By fall (September–October) temperatures generally fall back into the mid‑40s to mid‑50s °F range (7–13°C), and in winter the lake often sits near freezing around 32–40°F (0–4°C) with ice or fringing ice possible depending on snow and cold spells. Deeper water remains colder year‑round.
Swimming is generally possible at Bumping Lake, and people do enter the water for recreation, but the lake’s cool temperatures, sudden drops in depth, and boat traffic make it less comfortable and potentially risky compared with lower‑elevation beaches. Cold shock and rapid onset of hypothermia are real concerns in water below the mid‑60s °F (about 18 °C). There are no lifeguards, and access points and rules can vary by season, so visitors should assess conditions, wear flotation if unsure, limit time in cold water, and heed any posted warnings or local guidance.