Canyon Ferry Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Canyon Ferry Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Canyon Ferry Lake today is 11.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used. 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 6 | 11.6°C | 10.0°C | |
| OCT 7 | 12.0°C | 10.0°C | |
| OCT 8 | 11.7°C | 10.0°C | |
| OCT 9 | 11.5°C | 10.0°C | |
| OCT 10 | 11.2°C | 10.0°C | |
| OCT 11 | 11.9°C | 10.0°C | |
| OCT 12 | 12.1°C | 10.0°C | |
| OCT 14 | 10.0°C | 11.6°C | |
| OCT 15 | 10.0°C | 11.5°C | |
| OCT 16 | 10.0°C | 11.4°C | |
| OCT 17 | 10.0°C | 11.4°C | |
| OCT 18 | 10.0°C | 11.3°C | |
| OCT 19 | 10.0°C | 11.2°C | |
| OCT 20 | 10.0°C | 11.1°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 | 4°C | 6°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 5°C | 9°C |
| April | 0°C | 6°C | 12°C |
| May | 4°C | 11°C | 18°C |
| June | 9°C | 14°C | 19°C |
| July | 14°C | 20°C | 26°C |
| August | 17°C | 21°C | 25°C |
| September | 13°C | 17°C | 22°C |
| October | 4°C | 10°C | 16°C |
| November | 2°C | 6°C | 10°C |
| December | 1°C | 6°C | 10°C |
Canyon Ferry Lake: Water Temperature by Location
Canyon Ferry Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
Location & Local Information
Canyon Ferry Lake, a reservoir near Helena, experiences pronounced seasonal swings in water temperature. In spring the surface is typically cool, often ranging from roughly 40–60°F (4–16°C) as runoff and cooler air keep the lake chilly. By early summer temperatures commonly climb into the 60s°F (about 16–20°C) and peak in mid to late summer with surface readings often between 65–75°F (18–24°C) on warm, sunny days. Fall brings gradual cooling back toward the 50s–60s°F (10–16°C) before winter conditions drive temperatures toward freezing; portions of the lake can approach 32–40°F (0–4°C) and may ice over in sustained cold spells.
Swimming is allowed at public recreation areas and beaches around Canyon Ferry, and many visitors do swim in summer when surface temperatures are most comfortable. However, because it is a reservoir there are safety considerations: water can remain colder below the surface, boat traffic, sudden drop-offs, gusty winds, and variable water levels can increase risk, and most sites do not have lifeguards. Occasional water quality or algal advisories and seasonal closures may be posted, so swimmers are advised to use designated beaches, check local notices, and exercise caution when temperatures are cool or conditions are rough.