Gallatin River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Gallatin River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Gallatin River today is 21.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUL 14 | 20.5°C | 18.7°C | |
| JUL 15 | 23.9°C | 18.7°C | |
| JUL 16 | 22.8°C | 18.7°C | |
| JUL 17 | 22.6°C | 18.7°C | |
| JUL 18 | 22.8°C | 18.7°C | |
| JUL 19 | 23.1°C | 18.7°C | |
| JUL 20 | 23.1°C | 18.7°C | |
| JUL 21 | 22.7°C | 18.7°C | |
| JUL 22 | 18.7°C | 21.7°C | |
| JUL 23 | 18.7°C | 21.6°C | |
| JUL 24 | 18.7°C | 21.4°C | |
| JUL 25 | 18.7°C | 21.3°C | |
| JUL 26 | 18.7°C | 21.1°C | |
| JUL 27 | 18.7°C | 20.9°C | |
| JUL 28 | 18.7°C | 20.8°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 | 5°C | 9°C |
| February | 0°C | 5°C | 9°C |
| March | 0°C | 6°C | 11°C |
| April | 4°C | 11°C | 16°C |
| May | 7°C | 14°C | 21°C |
| June | 12°C | 17°C | 22°C |
| July | 13°C | 19°C | 24°C |
| August | 17°C | 21°C | 23°C |
| September | 11°C | 18°C | 19°C |
| October | 6°C | 11°C | 16°C |
| November | 0°C | 9°C | 16°C |
| December | 1°C | 5°C | 8°C |
Gallatin River: Water Temperature by Location
Gallatin River: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Source Gallatin Range,
• location Wyoming,Gallatin Lake,Three Rivers Peak
Mouth Missouri River
• location Montana
Length 120 mi (190 km)
The Gallatin River, flowing through Montana and Yellowstone National Park, is a cold and fast-moving river that reflects its mountain origins. Fed by snowmelt and mountain springs, the river’s water temperature stays quite cool throughout the year. In spring and early summer, the river is often icy, with temperatures ranging from 40°F to 50°F (4°C to 10°C). By late summer, as the flow slows and air temperatures rise, the water can warm slightly to around 55°F–65°F (13°C–18°C), especially in calmer stretches.
Swimming in the Gallatin River is not very common due to its cold water, swift currents, and rugged terrain. The river is better known for fly fishing, whitewater rafting, and kayaking, which attract outdoor enthusiasts from around the country. For those seeking to cool off, brief wading or dipping in slower-moving sections during summer can be refreshing, but caution is advised due to the strong currents and variable depths. The Gallatin River’s beauty and untamed character make it a destination for adventure rather than leisurely swimming.