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Castle Lake, MT Weather Forecast

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Castle Lake, MT Weather Forecast

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Castle Lake MT weather - Clear - 39°F
Clear
39°F
Updated 4:41 am
Feels Like 29°F
Humidity 80%
Wind NW 8 mph
Barometer  30.51 in
Dew Point 33°F
Castle Lake MT weather - Clear - 4°C
Clear
4°C
Updated 4:41 am
Feels Like -2°C
Humidity 80%
Wind NW 13 km/h
Barometer  103.3 kPa
Dew Point 1°C
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Castle Lake Weather Forecast

TODAY TONIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT
Castle Lake, MT Weather - Today Sunny Castle Lake, MT Weather - Tonight Mostly Clear Castle Lake, MT Weather - Friday Sunny Castle Lake, MT Weather - Friday Night Mostly Clear Castle Lake, MT Weather - Saturday Sunny Castle Lake, MT Weather - Saturday Night Partly Cloudy Castle Lake, MT Weather - Sunday Sunny Castle Lake, MT Weather - Sunday Night Mostly Clear Castle Lake, MT Weather - Monday Sunny Castle Lake, MT Weather - Monday Night Partly Cloudy Castle Lake, MT Weather - Tuesday Snow Showers Castle Lake, MT Weather - Tuesday Night Rain/Snow Showers
Sunny Mostly Clear Sunny Mostly Clear Sunny Partly Cloudy Sunny Mostly Clear Sunny Partly Cloudy Snow Showers Rain/Snow Showers
Hi: 41°FHi: 5°C
 Lo: 21°FLo: -6°C Hi: 61°FHi: 16°C
 Lo: 29°FLo: -2°C Hi: 61°FHi: 16°C
 Lo: 29°FLo: -2°C Hi: 61°FHi: 16°C
 Lo: 31°FLo: -1°C Hi: 61°FHi: 16°C
 Lo: 31°FLo: -1°C Hi: 59°FHi: 15°C
 Lo: 31°FLo: -1°C
POP: 30% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 416 AM MDT Thu Oct 15 2026 Castle Lake, MT Weather - WeatherWorld.com

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Issued: 1241 AM MDT Thu Oct 15 2026

Key Messages

  • Windy conditions over the plains of eastern Montana Today.
  • Widespread low temperatures near to below freezing tonight into Friday morning.
  • Warmer and dry Friday into the weekend, with periods of wind Friday into Saturday.

Discussion

...

Today through Wednesday...

A dry cold front moving through the region overnight will bring breezy winds to southeastern Montana today. Lingering precipitation along the Dakotas border will come to an end once the front moves through. Expect widespread gus...