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Ismay, MT Weather

It is 42°F in Ismay, MT, observed at 7:40 PM MDT. Tonight: Mostly Cloudy then Areas Of Fog, low 41°F. Hourly and 7-day forecast from the National Weather Service. Times are local (MDT).

Ismay, MT current weather

42°F

Cloudy

H -- / L 41°Feels like 38°

  • No rain expected in the next 12 hours

Observed at KNOWLTON (17.5 mi away), 10/30/2026, 7:40 PM MDT

Hourly forecast

NWS, updated 10/30/2026, 5:47 PM PT

  1. Now48°
  2. 9 PM45°
  3. 10 PM44°
  4. 11 PM44°
  5. 12 AM44°Sat
  6. 1 AM44°
  7. 2 AM43°
  8. 3 AM42°
  9. 4 AM42°
  10. 5 AM42°
  11. 6 AM42°
  12. 7 AM42°
  13. 8 AM42°
  14. 9 AM45°
  15. 10 AM50°
  16. 11 AM53°
  17. 12 PM55°
  18. 1 PM58°
  19. 2 PM60°
  20. 3 PM60°
  21. 4 PM61°13%
  22. 5 PM60°24%
  23. 6 PM57°22%
  24. 7 PM54°24%
  25. 8 PM51°19%
  26. 9 PM50°
  27. 10 PM47°
  28. 11 PM46°
  29. 12 AM46°Sun
  30. 1 AM45°
  31. 1 AM44°
  32. 2 AM43°
  33. 3 AM42°
  34. 4 AM42°
  35. 5 AM42°
  36. 6 AM41°
  37. 7 AM42°
  38. 8 AM44°
  39. 9 AM47°
  40. 10 AM51°
  41. 11 AM54°
  42. 12 PM57°
  43. 1 PM59°
  44. 2 PM60°
  45. 3 PM60°
  46. 4 PM59°
  47. 5 PM57°52%
  48. 6 PM56°52%

7-day forecast

Tap a day for details

  • Today10/30Low 41°High

    Tonight: Areas of fog after midnight. Mostly cloudy, with a low around 41. East southeast wind 6 to 9 mph.

    Mostly Cloudy then Areas Of Fog
  • Sat10/3124% chance of precipitationLow 41°High 61°

    Saturday: Areas of fog before noon, then a slight chance of rain showers. Cloudy, with a high near 61. Southeast wind 5 to 8 mph. Chance of precipitation is 20%.

    Saturday Night: Areas of fog and a slight chance of rain showers. Cloudy, with a low around 41. Southwest wind 0 to 3 mph. Chance of precipitation is 20%.

    Areas Of Fog then Slight Chance Rain Showers
  • Sun11/187% chance of precipitationLow 44°High 61°

    Sunday: Patchy fog before 11am, then a chance of rain showers. Cloudy. High near 61, with temperatures falling to around 57 in the afternoon. Southeast wind 1 to 8 mph. Chance of precipitation is 50%.

    Sunday Night: Rain showers. Cloudy, with a low around 44. East northeast wind 3 to 7 mph. Chance of precipitation is 90%.

    Patchy Fog then Chance Rain Showers
  • Mon11/287% chance of precipitationLow 33°High 53°

    Monday: Rain showers. Cloudy. High near 53, with temperatures falling to around 48 in the afternoon. Northwest wind 7 to 17 mph. Chance of precipitation is 90%.

    Monday Night: A chance of rain showers before 11pm. Mostly cloudy, with a low around 33. West northwest wind 2 to 16 mph. Chance of precipitation is 40%.

    Rain Showers
  • Tue11/3Low 35°High 55°

    Tuesday: Mostly sunny. High near 55, with temperatures falling to around 50 in the afternoon. West wind 2 to 7 mph.

    Tuesday Night: Partly cloudy, with a low around 35. West southwest wind around 3 mph.

    Mostly Sunny
  • Wed11/4Low 32°High 54°

    Wednesday: Mostly sunny. High near 54, with temperatures falling to around 48 in the afternoon. Northwest wind 2 to 6 mph.

    Wednesday Night: Partly cloudy, with a low around 32. East northeast wind 1 to 5 mph.

    Mostly Sunny
  • Thu11/5Low 34°High 55°

    Thursday: Mostly sunny. High near 55, with temperatures falling to around 49 in the afternoon. East southeast wind 1 to 8 mph.

    Thursday Night: Partly cloudy, with a low around 34. Southeast wind 2 to 6 mph.

    Mostly Sunny
  • Fri11/6Low High 57°

    Friday: Mostly sunny. High near 57, with temperatures falling to around 51 in the afternoon. South wind 2 to 7 mph.

    Mostly Sunny

Forecast for 46.500, -104.793 from the NWS BYZ office, updated 10/30/2026, 5:47 PM PT · Official forecast on weather.gov

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now48°Cloudy1%9 mph
  2. 9 PM45°Mostly Cloudy1%8 mph
  3. 10 PM44°Mostly Cloudy0%8 mph
  4. 11 PM44°Mostly Cloudy0%7 mph
  5. 12 AM44°Areas Of Fog0%7 mph
  6. 1 AM44°Areas Of Fog0%6 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the weather in Ismay, MT right now?
The latest observation from KNOWLTON was 42°F, reported at 10/30/2026, 7:40 PM MDT.
Will it rain in Ismay, MT in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What time is sunrise and sunset in Ismay, MT today?
Sunrise is about 7:38 AM MDT and sunset is about 5:47 PM MDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Ismay, MT?
At Plevna, the 1991 to 2020 normal high in October is 58°F and the normal low is 31°F.

Rain and snow totals

Next 3 days, NWS forecast grid

Rain (liquid)
0.79 in
Snow
0.00 in
Ice
0.00 in

Nearby hazards

Montana hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

Drought

By county

Custer County, week of 10/27/2026

87% of the county is in moderate drought or worse, 20% in extreme drought or worse.

Sun and moon

Local time, center of the area

Sunrise
7:38 AM
Sunset
5:47 PM
Daylight
10 hr 9 min
Moon
Waning Gibbous 75% lit
First light (civil dawn)
7:07 AM
Last light (civil dusk)
6:18 PM
Moonrise
9:13 PM
Moonset
1:13 PM

Normal October weather

Climate

Normal October high 58°, low 31°, precipitation 1.16 in for the month. 1991 to 2020 normals at Plevna, 14 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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