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      Flood Watch
      until 12:00 PM MDT
      Elev 2897 ft, 47.817 °N 114.337 °W

      Big Arm, MT

      Big Arm Station54°
      Updated: 2:08 AM MDT on September 7, 2026 (GMT -6)
      8 minutes ago
      69°
      54°
      54
      Feels Like 54
      Cloudy
      N
      3
      Lower temperature is expected today
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Tonight
        Mon 09/07
        Low 50°f
         85% Precip. / 0.14 in
        Periods of rain. Low near 50F. Winds light and variable. Chance of rain 90%.
        Tomorrow
        Tue 09/08
        High 55°f
         99% Precip. / 0.37 in
        Cloudy with periods of rain. High around 55F. Winds SSW at 5 to 10 mph. Chance of rain 100%. Rainfall near a quarter of an inch.
        Tomorrow night
        Tue 09/08
        Low 47°f
         54% Precip. / 0.07 in
        Cloudy with occasional showers late at night. Low 47F. Winds SSW at 5 to 10 mph. Chance of rain 50%.
        Hourly Forecast
        Now
        54°
        3AM
        78%
        54°
        4AM
        50%
        54°
        5AM
        54°
        6AM
        45%
        54°
        7AM
        99%
        53°
        7:04AM
        Sunrise
        8AM
        96%
        51°
        9AM
        77%
        52°
        10AM
        91%
        51°
        11AM
        88%
        50°
        12PM
        70%
        51°
        1PM
        54%
        52°
        2PM
        62%
        52°
        3PM
        60%
        53°
        4PM
        61%
        53°
        5PM
        36%
        54°
        6PM
        55°
        7PM
        55°
        8PM
        54°
        8:05PM
        Sunset
        9PM
        53°
        10PM
        53°
        11PM
        52°
        12AM
        52°
        1AM
        51°
        2AM
        31%
        51°
        Precipitation
        99%
        Rain expected around 2:30 AM
        Pollen
        Grass Pollen
        Low
        Air Quality
        31
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.84 in
        2. Visibility 9 miles
        3. Clouds Cloudy
        4. Dew Point54°F
        5. Humidity 97%
        6. Rainfall 0.04 in
        7. Snow Depth 0 in
         KGPI Station History
        Almanac for September 7, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 69°F 75°F 90°F 2022
        4. Low 54°F 45°F 34°F 2016
        5. Rain/Snow Depth
        6. Precipitation 0.14 in 3.5 in -
        7. Snow 0 in 0 in -
        Almanac for September 8, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 55°F 75°F 90°F
        4. Low 54°F 45°F 34°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 7:03 AM 8:05 PM
        3. Civil Twilight 6:32 AM 8:37 PM
        4. Nautical Twilight 5:54 AM 9:14PM
        5. Astronomical Twilight 5:14 AM 9:54 PM
        1. Length of Visible Light 14h 4m
        2. Length of Day 13h 1m
        3. Tomorrow will be 3 minutes 25 seconds shorter
        1. Moon 2:24 AM 6:40 PM
        2. Waning Crescent17% of the Moon is Illuminated
        Sep 10
        New Moon
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Precipitation
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