Great Falls — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Great Falls, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Great Falls today is 19.8°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 |
|---|---|---|---|
| AUG 24 | 21.0°C | 20.2°C | |
| AUG 25 | 20.9°C | 20.2°C | |
| AUG 26 | 20.9°C | 20.2°C | |
| AUG 27 | 19.6°C | 20.2°C | |
| AUG 28 | 21.1°C | 20.2°C | |
| AUG 29 | 21.1°C | 20.2°C | |
| AUG 30 | 19.9°C | 20.2°C | |
| AUG 31 | 20.0°C | 20.2°C | |
| SEP 1 | 15.5°C | 19.6°C | |
| SEP 2 | 15.5°C | 19.4°C | |
| SEP 3 | 15.5°C | 19.2°C | |
| SEP 4 | 15.5°C | 18.9°C | |
| SEP 5 | 15.5°C | 18.7°C | |
| SEP 6 | 15.5°C | 18.5°C | |
| SEP 7 | 15.5°C | 18.3°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 | 1°C | 5°C | 9°C |
| February | 1°C | 5°C | 9°C |
| March | 1°C | 6°C | 11°C |
| April | 3°C | 10°C | 16°C |
| May | 6°C | 14°C | 21°C |
| June | 12°C | 18°C | 22°C |
| July | 15°C | 20°C | 25°C |
| August | 17°C | 20°C | 24°C |
| September | 11°C | 16°C | 20°C |
| October | 8°C | 13°C | 17°C |
| November | 2°C | 10°C | 16°C |
| December | 2°C | 5°C | 8°C |
Great Falls: Weather Forecast
September 1
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September 3
September 4
September 5
Location & Local Information
In Great Falls, Montana, the Missouri River runs through the city, providing stunning landscapes and recreational opportunities. However, the water temperature of the river can be quite cold, particularly in the spring and early summer months. During this time, the water temperature typically ranges from 40°F to 55°F (4°C to 13°C), making swimming in the river uncomfortable and potentially dangerous due to the cold, fast-moving currents. The presence of rocks, debris, and strong undertows also makes the Missouri River less ideal for casual swimming.
In the summer, the water temperature in the Missouri River can rise slightly, reaching more tolerable levels of around 60°F to 70°F (15°C to 21°C), especially in the calmer sections. While these temperatures might be acceptable for brief wading or cooling off, the river's strong current still presents challenges for swimming. Many locals and visitors prefer other water-based activities such as fishing, kayaking, and boating, which allow for more control and enjoyment in the river's waters.
For those looking for a safer, more comfortable swimming experience, Great Falls offers several public swimming pools and nearby lakes. These areas provide warm, controlled environments ideal for swimming, with temperatures typically around 78°F to 82°F (26°C to 28°C). Additionally, nearby recreational areas like Giant Springs State Park offer peaceful locations for picnicking and enjoying nature, along with areas for safer water-based activities during the warmer months.