Water Temperature of the South Fork Flathead River in Columbia Falls, MT

Current Water Temperature

45.1°F

Measurement Time: Monday, May 18, 2026, 6:45 AM MDT

Temperature Locations

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Local Points of Interest

Hungry Horse, MT

South Fork Flathead River

Station Name: S F Flathead River nr Columbia Falls MT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 3,091 feet

Nearest Address:
Columbia Falls, MT 59912
Flathead County

GPS Coordinates: 48.35657778, -114.0378583

Nearby Water Temperatures

Birch Creek, Valier, MT (78.9 mi)
Kootenai River, Troy, MT (93.7 mi)
Clark Fork, East Missoula, MT (102.4 mi)
Kootenai River, Bonners Ferry, ID (106.7 mi)
Kootenai River, Bonners Ferry, ID (111.3 mi)
Sun River, Simms, MT (114 mi)
Kootenai River, Copeland, ID (114.4 mi)
Kootenai River, Porthill, ID (121 mi)
North Fork Clearwater River, Pierce, ID (128.1 mi)
Missouri River, Wolf Creek, MT (133.2 mi)
Pend Oreille River, Metaline Falls, WA (157.3 mi)
Pend Oreille River, Metaline Falls, WA (157.6 mi)
Warm Springs Creek, Warm Springs, MT (161.4 mi)
Marias River, Loma, MT (161.8 mi)
Orofino River, Orofino, ID (166.1 mi)

Weather for Columbia Falls, Montana

Current Weather

54°F
Partly Cloudy
Partly Cloudy
52.6°F
53.8°F
41%
SW 5.6 mph
6.4 mph
52.5°F
28.6°F
0 in
0%
9 mi
1020 mbar
6.9

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 56°F
L: 33°F
Patchy rain nearby
Tue
H: 56°F
L: 32°F
Moderate rain
Wed
H: 52°F
L: 34°F
Patchy rain nearby
Thu
H: 62°F
L: 39°F
Sunny
Fri
H: 66°F
L: 36°F

Air Quality

AQI: 1 - Good
PM2.5: 4.85 μg/m3
PM10: 6.15 μg/m3
Carbon Monoxide: 131.85 μg/m3
Nitrogen Dioxide: 1.65 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 93 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:32 PM
Sunset: 9:14 PM
Daylight: 15 hrs 21 mins
Moonrise: 6:49 AM
Moon Transit: 3:37 PM
Moonset: 12:17 AM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:07 PM - 5:37 PM

Minor Periods

6:19 AM - 7:49 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 8:00AM MDT by NWS Missoula MT

Effective: Sun May 17, 2026, 5:01 PM
Expires: Mon May 18, 2026, 8:00 AM

* WHAT...Temperatures between 25 and 34 degrees will result in frost formation. * WHERE...Kootenai/Cabinet Region. * WHEN...From midnight tonight to 8 AM MDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Temperature ranges include: 31 to 35 degrees in Eureka, 25 to 28 in Olney, 32 to 36 Libby and Troy areas, 30 to 35 south of Libby to Happys Inn and 26 to 31 Marion and Yaak areas.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 9:00AM MDT by NWS Missoula MT

Effective: Sun May 17, 2026, 5:01 PM
Expires: Mon May 18, 2026, 9:00 AM

* WHAT...Temperatures as low as 28 degrees will result in frost formation. * WHERE...Flathead/Mission Valleys and Missoula/Bitterroot Valleys. * WHEN...From 8 PM this evening to 9 AM MDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Low-lying areas of the Bitterroot Valley could fall between 24 and 28 degrees.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT

Effective: Mon May 18, 2026, 12:00 PM
Expires: Tue May 19, 2026, 9:00 AM

* WHAT...Temperature ranges between 30 and 32 will result in frost formation. * WHERE...Flathead/Mission Valleys. * WHEN...From midnight tonight to 9 AM MDT Tuesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Temperature ranges: 32 to 37 degrees in the Flathead Valley, and 30 to 35 in the Mission Valley.

Take steps now to protect tender plants from the cold.
Monday, May 18, 2026

Weather Forecast

Patchy rain nearby
56.1°F
32.9°F
44.8°F
56%
0.04 in
83%
4%
5.6 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 7.08 μg/m3
PM10: 9.18 μg/m3
Carbon Monoxide: 125.05 μg/m3
Nitrogen Dioxide: 4.12 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:32 PM
Sunset: 9:14 PM
Daylight: 15 hrs 21 mins
Moonrise: 6:49 AM
Moon Transit: 3:37 PM
Moonset: 12:17 AM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:07 PM - 5:37 PM

Minor Periods

6:19 AM - 7:49 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Tuesday, May 19, 2026

Weather Forecast

Patchy rain nearby
55.9°F
32.4°F
44.8°F
79%
0.19 in
88%
16%
5.4 mph
6.2


Air Quality

AQI: 1 - Good
PM2.5: 5.69 μg/m3
PM10: 6.88 μg/m3
Carbon Monoxide: 139.93 μg/m3
Nitrogen Dioxide: 3.5 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 85.16 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:32 PM
Sunset: 9:15 PM
Daylight: 15 hrs 24 mins
Moonrise: 7:59 AM
Moon Transit: 4:43 PM
Moonset: 12:26 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
4:13 PM - 6:43 PM

Minor Periods

7:29 AM - 8:59 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Moderate rain
52.4°F
33.7°F
43.6°F
88%
0.4 in
87%
0%
4 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 5.21 μg/m3
PM10: 6.29 μg/m3
Carbon Monoxide: 138.57 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 1.34 μg/m3
Ozone: 88 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:32 PM
Sunset: 9:16 PM
Daylight: 15 hrs 26 mins
Moonrise: 9:21 AM
Moon Transit: 5:45 PM
Moonset: 1:16 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

1:24 AM - 3:54 AM
5:15 PM - 7:45 PM

Minor Periods

8:51 AM - 10:21 AM
12:46 AM - 2:16 AM

Action Rating: 2 out of 5

Thursday, May 21, 2026

Weather Forecast

Patchy rain nearby
62.2°F
38.8°F
49.5°F
71%
0.1 in
82%
0%
3.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.65 μg/m3
PM10: 6.32 μg/m3
Carbon Monoxide: 129.91 μg/m3
Nitrogen Dioxide: 3.36 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 79.08 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:32 PM
Sunset: 9:17 PM
Daylight: 15 hrs 29 mins
Moonrise: 10:46 AM
Moon Transit: 6:40 PM
Moonset: 1:51 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

2:23 AM - 4:53 AM
6:10 PM - 8:40 PM

Minor Periods

10:16 AM - 11:46 AM
1:21 AM - 2:51 AM

Action Rating: 2 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
66.3°F
35.6°F
51.7°F
62%
0 in
0%
0%
5.4 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 6.57 μg/m3
PM10: 8.01 μg/m3
Carbon Monoxide: 155.52 μg/m3
Nitrogen Dioxide: 4.91 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 71.38 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:32 PM
Sunset: 9:18 PM
Daylight: 15 hrs 31 mins
Moonrise: 12:08 AM
Moon Transit: 7:31 PM
Moonset: 2:17 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
7:01 PM - 9:31 PM

Minor Periods

11:38 AM - 1:08 PM
1:47 AM - 3:17 AM

Action Rating: 4 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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