Water Temperature of the Sun River in Simms, MT

Current Water Temperature

47.1°F

Measurement Time: Sunday, May 17, 2026, 12:30 PM MDT

Temperature Locations

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Sun River

Station Name: Sun River at Simms MT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 3,550 feet

Nearest Address:
99 Simms Fairfield Rd
Simms, MT 59477
Cascade County

GPS Coordinates: 47.50162778, -111.9319139

Nearby Water Temperatures

Missouri River, Wolf Creek, MT (35.2 mi)
Birch Creek, Valier, MT (64 mi)
Camas Creek, White Sulphur Springs, MT (66.7 mi)
Marias River, Loma, MT (69.9 mi)
Missouri River, Toston, MT (96.7 mi)
Warm Springs Creek, Warm Springs, MT (99.8 mi)
Clark Fork, East Missoula, MT (103.4 mi)
Jefferson River, Three Forks, MT (112 mi)
South Fork Flathead River, Columbia Falls, MT (114 mi)
Jefferson River, Waterloo, MT (121.8 mi)
Jefferson River, Twin Bridges, MT (131.8 mi)
Ruby River, Twin Bridges, MT (139.1 mi)
Madison River, Norris, MT (139.7 mi)
Big Hole River, Glen, MT (145.5 mi)
Big Hole River, Wisdom, MT (148.9 mi)

Weather for Simms, Montana

Current Weather

34°F
Patchy light snow
Patchy light snow
25.3°F
37.9°F
96%
NNE 11.9 mph
15 mph
29.7°F
32.9°F
0 in
100%
4 mi
1019 mbar
0.5

Five Day Weather Forecast

Patchy rain nearby
Sun
H: 40°F
L: 33°F
Partly Cloudy
Mon
H: 55°F
L: 32°F
Partly Cloudy
Tue
H: 63°F
L: 38°F
Moderate rain
Wed
H: 56°F
L: 40°F
Sunny
Thu
H: 63°F
L: 37°F

Air Quality

AQI: 1 - Good
PM2.5: 10.35 μg/m3
PM10: 11.95 μg/m3
Carbon Monoxide: 121.85 μg/m3
Nitrogen Dioxide: 2.45 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 67 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:24 PM
Sunset: 9:01 PM
Daylight: 15 hrs 13 mins
Moonrise: 5:50 AM
Moon Transit: 2:21 PM
Moonset: 11:03 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:51 PM - 4:21 PM

Minor Periods

12:00 AM - 12:00 AM
5:20 AM - 6:50 AM

Action Rating: 4 out of 5

Winter Weather Advisory issued May 17 at 5:55AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT

Effective: Sun May 17, 2026, 5:55 AM
Expires: Sun May 17, 2026, 9:00 PM

* WHAT...Snow. Additional snow accumulations up to 4 inches. Winds gusting as high as 40 mph. * WHERE...The Continental Divide along the Rocky Mountain Front, Upper Blackfoot and MacDonald Pass, and Elkhorn and Boulder Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website.


Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT

Effective: Sun May 17, 2026, 11:51 AM
Expires: Mon May 18, 2026, 12:00 AM

* WHAT...Snow. Additional snow accumulations up to two inches. Winds gusting as high as 40 mph. * WHERE...The Continental Divide along the Rocky Mountain Front, Upper Blackfoot and MacDonald Pass, and Elkhorn and Boulder Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website.


Winter Weather Advisory issued May 17 at 6:17PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT

Effective: Sun May 17, 2026, 6:17 PM
Expires: Mon May 18, 2026, 12:00 AM

* WHAT...Snow. Additional snow accumulations of 1 to 2 inches. * WHERE...Upper Blackfoot and MacDonald Pass and Southern Rocky Mountain Front. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery road conditions.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website.


Winter Weather Advisory issued May 17 at 5:55AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT

Effective: Sun May 17, 2026, 5:55 AM
Expires: Sun May 17, 2026, 9:00 PM

* WHAT...Snow. Additional snow accumulations up to 5 inches. Winds gusting as high as 40 mph. * WHERE...Big Belt, Bridger and Castle Mountains and Little Belt and Highwood Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website. To see a graphical representation of the degree of stress on young livestock please visit our webpage and select Local Programs then Cold Air Advisory for Newborn Livestock.


Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT

Effective: Sun May 17, 2026, 11:51 AM
Expires: Mon May 18, 2026, 12:00 AM

* WHAT...Snow. Additional snow accumulations up to two inches. Winds gusting as high as 40 mph. * WHERE...Big Belt, Bridger and Castle Mountains and Little Belt and Highwood Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website. To see a graphical representation of the degree of stress on young livestock please visit our webpage and select Local Programs then Cold Air Advisory for Newborn Livestock.
Sunday, May 17, 2026

Weather Forecast

Patchy rain nearby
40.1°F
32.9°F
37.9°F
77%
0.11 in
86%
0%
20.4 mph
3.1


Air Quality

AQI: 1 - Good
PM2.5: 1.53 μg/m3
PM10: 1.65 μg/m3
Carbon Monoxide: 128.45 μg/m3
Nitrogen Dioxide: 1.91 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 71.92 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:24 PM
Sunset: 9:01 PM
Daylight: 15 hrs 13 mins
Moonrise: 5:50 AM
Moon Transit: 2:21 PM
Moonset: 11:03 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:51 PM - 4:21 PM

Minor Periods

12:00 AM - 12:00 AM
5:20 AM - 6:50 AM

Action Rating: 4 out of 5

Monday, May 18, 2026

Weather Forecast

Partly Cloudy
55.1°F
31.5°F
43.4°F
60%
0 in
0%
0%
8.1 mph
5.5


Air Quality

AQI: 1 - Good
PM2.5: 6.87 μg/m3
PM10: 7.99 μg/m3
Carbon Monoxide: 122.41 μg/m3
Nitrogen Dioxide: 2.08 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 71.76 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:24 PM
Sunset: 9:02 PM
Daylight: 15 hrs 15 mins
Moonrise: 6:45 AM
Moon Transit: 3:28 PM
Moonset: 12:03 AM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:58 PM - 5:28 PM

Minor Periods

6:15 AM - 7:45 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Tuesday, May 19, 2026

Weather Forecast

Partly Cloudy
62.7°F
37.9°F
51.5°F
49%
0 in
0%
0%
12.1 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 2.7 μg/m3
PM10: 3.19 μg/m3
Carbon Monoxide: 122.85 μg/m3
Nitrogen Dioxide: 3.89 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 67.56 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:24 PM
Sunset: 9:03 PM
Daylight: 15 hrs 18 mins
Moonrise: 7:55 AM
Moon Transit: 4:34 PM
Moonset: 12:12 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:28 AM - 2:58 AM
4:04 PM - 6:34 PM

Minor Periods

7:25 AM - 8:55 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Moderate rain
56.1°F
40.2°F
46.1°F
70%
0.43 in
84%
0%
19 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 3.47 μg/m3
PM10: 4.26 μg/m3
Carbon Monoxide: 127.78 μg/m3
Nitrogen Dioxide: 3.12 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 72.88 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:24 PM
Sunset: 9:05 PM
Daylight: 15 hrs 20 mins
Moonrise: 9:16 AM
Moon Transit: 5:36 PM
Moonset: 1:03 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

1:33 AM - 4:03 AM
5:06 PM - 7:36 PM

Minor Periods

8:46 AM - 10:16 AM
12:33 AM - 2:03 AM

Action Rating: 2 out of 5

Thursday, May 21, 2026

Weather Forecast

Sunny
62.8°F
36.7°F
50.3°F
57%
0 in
0%
0%
7.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.09 μg/m3
PM10: 5.05 μg/m3
Carbon Monoxide: 135.04 μg/m3
Nitrogen Dioxide: 6.56 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 65.62 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:24 PM
Sunset: 9:06 PM
Daylight: 15 hrs 22 mins
Moonrise: 10:40 AM
Moon Transit: 6:32 PM
Moonset: 1:39 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

2:32 AM - 5:02 AM
6:02 PM - 8:32 PM

Minor Periods

10:10 AM - 11:40 AM
1:09 AM - 2:39 AM

Action Rating: 2 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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