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Flathead River
Flathead River Current Water Temperature and Forecast
On this page, you will find comprehensive information about the water temperature in Flathead River, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Water Temperature in Flathead River
46°F
TODAY
46°F
YESTERDAY
38°F
A WEEK AGO
As of today, the minimum water temperature in the Flathead River ranges from 41°F (5°C) to 47°F (8°C). This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold.
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.
Analysis, Historical Data, and Forecast of Water Temperature
Water Temperature Chart for Flathead River Over the Last 30 Days
Today the water temperature in Flathead River is lower than the same day in previous years. The water temperature range here in May is from 39°F to 70°F. The water temperature is trending upward, and it has increased both over the past 30 days and the past week.
The forecasted water temperature values for Flathead River are presented in the table below.
The actual water temperature values near the shore may differ by a few degrees from the stated values. For the development of the forecast, we use our own mathematical model that takes into account the current water temperature changes, historical data, and key weather trends, including wind strength and direction, and air temperature in each specific region.
Daily Water Temperature Chart
| Date | Current | Average | Forecast |
|---|---|---|---|
| May 2 | 38°F | 55°F | |
| May 3 | 40°F | 55°F | |
| May 4 | 40°F | 55°F | |
| May 5 | 45°F | 55°F | |
| May 6 | 46°F | 55°F | |
| May 7 | 46°F | 55°F | |
| May 8 | 46°F | 55°F | |
| May 9 | 46°F | 55°F | |
| May 10 | 55°F | 46°F | |
| May 11 | 55°F | 47°F | |
| May 12 | 55°F | 47°F | |
| May 13 | 55°F | 48°F | |
| May 14 | 55°F | 48°F | |
| May 15 | 55°F | 49°F | |
| May 16 | 55°F | 49°F | |
| May 17 | 55°F | 49°F |
Water Temperature Ranges in Flathead River by Month
January
| Minimum | Average | Maximum |
|---|---|---|
| 34°F | 41°F | 48°F |
February
| Minimum | Average | Maximum |
|---|---|---|
| 34°F | 41°F | 48°F |
March
| Minimum | Average | Maximum |
|---|---|---|
| 32°F | 42°F | 52°F |
April
| Minimum | Average | Maximum |
|---|---|---|
| 34°F | 47°F | 61°F |
May
| Minimum | Average | Maximum |
|---|---|---|
| 39°F | 55°F | 70°F |
June
| Minimum | Average | Maximum |
|---|---|---|
| 57°F | 65°F | 72°F |
July
| Minimum | Average | Maximum |
|---|---|---|
| 63°F | 68°F | 75°F |
August
| Minimum | Average | Maximum |
|---|---|---|
| 63°F | 71°F | 73°F |
September
| Minimum | Average | Maximum |
|---|---|---|
| 52°F | 64°F | 66°F |
October
| Minimum | Average | Maximum |
|---|---|---|
| 46°F | 56°F | 61°F |
November
| Minimum | Average | Maximum |
|---|---|---|
| 37°F | 47°F | 61°F |
December
| Minimum | Average | Maximum |
|---|---|---|
| 37°F | 40°F | 46°F |
Monthly Water Temperature Histogram for Flathead River
Water Temperature in Cities and Towns on Flathead River
Flathead River Weather
MAY 10
52°F / 82°F
overcastrain: 1% | wind: 14 mph
MAY 11
50°F / 77°F
light drizzlerain: 27% | wind: 13 mph
MAY 12
45°F / 63°F
moderate rain showersrain: 52% | wind: 11 mph
MAY 13
37°F / 59°F
light drizzlerain: 52% | wind: 15 mph
MAY 14
39°F / 59°F
light drizzlerain: 44% | wind: 11 mph
Water Temperature in Flathead River: General Trends and Swimming Opportunities
Source Confluence of North Fork and Middle Fork Flathead River
• location Rocky Mountains
• elevation 3,120 ft (950 m)
Mouth Clark Fork
• location Montana
• elevation 2,484 ft (757 m)
Length 158 mi (254 km)
The Flathead River, located in northwestern Montana, is a pristine waterway known for its clear waters and stunning surroundings, including Glacier National Park. Its water temperature is significantly influenced by snowmelt from nearby mountains, keeping the river cold for much of the year. During spring and early summer, temperatures often hover between 40°F and 50°F (4°C–10°C), making the water brisk and refreshing. By mid to late summer, in slower sections or areas exposed to the sun, water temperatures can reach up to 60°F–70°F (15°C–21°C), providing more comfortable conditions for recreational activities.
Swimming in the Flathead River is possible during the warmer months, especially in calmer areas like river bends or designated swimming spots near campgrounds and parks. However, the river’s strong currents and cold water make it more suited for activities like floating, kayaking, and paddleboarding. For those looking to swim, it’s best to stick to shallow, still sections and always exercise caution due to the river’s varying depths and flow rates. The Flathead River offers a unique opportunity to enjoy Montana’s natural beauty while cooling off in its refreshing waters.
Geographical Location of Flathead River
Nearby Rivers
Frequently Asked Questions About Flathead River and its Water Temperatures
What is the current water temperature in Flathead River?
The water temperature today in Flathead River ranges from 45°F (7.0°C) to 47°F (8.1°C).
What is the water temperature in Flathead River during the summer months?
The average water temperature in Flathead River during the summer months is typically between 65°F to 71°F (19°C to 21°C), and it can reach up to 75°F (24°C) at its warmest. However, in some years, the temperature may exceed this range.
What is the water temperature in Flathead River in May?
The average water temperature in Flathead River in May ranges from 46°F to 70°F (8°C to 21°C).
What is the water temperature in Flathead River in September?
The average water temperature in Flathead River in September is typically between 52°F to 66°F (11°C to 19°C).
Where does Flathead River flow?
Flathead River flows through United States (Montana), Canada (British Columbia).
Is it possible to swim in the Flathead River?
Yes, it is possible to swim in the Flathead River. However, one should always be mindful of the river's current and potential wildlife.