Weather for Grayling, Montana
Current Weather
Humidity: 52%
Feels Like: 64.9°F
Wind: SE 2.2 mph
Wind Gusts: 2.8 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast
Mon
H: 78°F
L: 55°F
Tue
H: 73°F
L: 59°F
Wed
H: 68°F
L: 50°F
Thu
H: 66°F
L: 46°F
Fri
H: 64°F
L: 43°F
Air Quality
Nitrogen Dioxide: 18.32 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 73 μg/m3
Astronomical
Sun Transit: 1:27 PM
Sunset: 8:14 PM
Daylight: 13 hrs 34 mins
Moon Transit: 3:19 PM
Moonset: 9:11 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:49 PM - 5:19 PM
Minor Periods
8:41 PM - 10:11 PM8:45 AM - 10:15 AM
Action Rating: 4 out of 5
Hydrologic Outlook issued August 25 at 4:54PM MDT by NWS Great Falls MT
Effective: Mon August 25, 2025, 4:54 PM
Expires: Tue August 26, 2025, 4:00 PM
ESFTFX Monsoon moisture will slowly move northward and bring periods of widespread rain and embedded thunderstorms to Southwest and portions of Central Montana Tuesday night through Friday. Localized heavier downpours in excess of a half inch per hour can be expected with the heavier cells in addition to the general four day storm totals between a quarter to an inch and a half. The most persistent and heaviest rainfall is expected along and south of I90 on Wednesday and Thursday. Impacts will mostly be limited to sensitive burn scars or other normally flood prone locations or areas of steep terrain and may include instances of localized flooding, debris flows, and rock slides. Those considering any backcountry travel for Wednesday and Thursday of this week should be prepared for periods of excessive rainfall, muddy roads, and potential localized flooding.
Hydrologic Outlook issued August 25 at 4:54PM MDT by NWS Great Falls MT
Effective: Mon August 25, 2025, 4:54 PM
Expires: Tue August 26, 2025, 4:00 PM
ESFTFX Monsoon moisture will slowly move northward and bring periods of widespread rain and embedded thunderstorms to Southwest and portions of Central Montana Tuesday night through Friday. Localized heavier downpours in excess of a half inch per hour can be expected with the heavier cells in addition to the general four day storm totals between a quarter to an inch and a half. The most persistent and heaviest rainfall is expected along and south of I90 on Wednesday and Thursday. Impacts will mostly be limited to sensitive burn scars or other normally flood prone locations or areas of steep terrain and may include instances of localized flooding, debris flows, and rock slides. Those considering any backcountry travel for Wednesday and Thursday of this week should be prepared for periods of excessive rainfall, muddy roads, and potential localized flooding.
Weather Forecast
Average Temperature: 67.3°F
Average Humidity: 33%
Wind: 3.6 mph
UV Index: 2.1
Air Quality
Nitrogen Dioxide: 7.5 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 111.8 μg/m3
Astronomical
Sun Transit: 1:27 PM
Sunset: 8:14 PM
Daylight: 13 hrs 34 mins
Moon Transit: 3:19 PM
Moonset: 9:11 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:49 PM - 5:19 PM
Minor Periods
8:41 PM - 10:11 PM8:45 AM - 10:15 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 64.9°F
Average Humidity: 53%
Wind: 6.3 mph
UV Index: 1.2
Air Quality
Nitrogen Dioxide: 7.62 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 101.76 μg/m3
Astronomical
Sun Transit: 1:27 PM
Sunset: 8:12 PM
Daylight: 13 hrs 31 mins
Moon Transit: 4:00 PM
Moonset: 9:28 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.1%
Best Times for Fishing or Hunting
Major Periods
12:13 AM - 2:43 AM3:30 PM - 6:00 PM
Minor Periods
8:58 PM - 10:28 PM9:51 AM - 11:21 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 60.2°F
Average Humidity: 64%
Wind: 8.9 mph
UV Index: 0.6
Air Quality
Nitrogen Dioxide: 6.76 μg/m3
Sulphur Dioxide: 0.52 μg/m3
Ozone: 100 μg/m3
Astronomical
Sun Transit: 1:26 PM
Sunset: 8:11 PM
Daylight: 13 hrs 28 mins
Moon Transit: 4:40 PM
Moonset: 9:46 PM
Moon Phase: Waxing Crescent
Moon Illumination: 12.6%
Best Times for Fishing or Hunting
Major Periods
12:54 AM - 3:24 AM4:10 PM - 6:40 PM
Minor Periods
9:16 PM - 10:46 PM10:56 AM - 12:26 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 56.9°F
Average Humidity: 81%
Wind: 5.6 mph
UV Index: 0.9
Air Quality
Nitrogen Dioxide: 4.74 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 106.2 μg/m3
Astronomical
Sun Transit: 1:26 PM
Sunset: 8:09 PM
Daylight: 13 hrs 25 mins
Moon Transit: 5:23 PM
Moonset: 10:07 PM
Moon Phase: Waxing Crescent
Moon Illumination: 21.1%
Best Times for Fishing or Hunting
Major Periods
1:36 AM - 4:06 AM4:53 PM - 7:23 PM
Minor Periods
9:37 PM - 11:07 PM12:02 AM - 1:32 PM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 52.7°F
Average Humidity: 75%
Wind: 10.7 mph
UV Index: 1.1
Air Quality
Nitrogen Dioxide: 5.35 μg/m3
Sulphur Dioxide: 0.19 μg/m3
Ozone: 106.38 μg/m3
Astronomical
Sun Transit: 1:26 PM
Sunset: 8:07 PM
Daylight: 13 hrs 22 mins
Moon Transit: 6:09 PM
Moonset: 10:33 PM
Moon Phase: Waxing Crescent
Moon Illumination: 31.0%
Best Times for Fishing or Hunting
Major Periods
2:20 AM - 4:50 AM5:39 PM - 8:09 PM
Minor Periods
10:03 PM - 11:33 PM1:09 PM - 2:39 PM
Action Rating: 3 out of 5