Expires:202607261800;;612160 FPUS55 KBYZ 260321 ZFPBYZ Zone Forecast Product for South Central and Southeast Montana National Weather Service Billings MT 920 PM MDT Sat Jul 25 2026 Spot temperatures and probabilities of measurable precipitation are for the rest of tonight, Sunday, Sunday night, and Monday. MTZ141-261800- Northern Sweet Grass- Including the city of Big Timber 920 PM MDT Sat Jul 25 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT SUNDAY... .REST OF TONIGHT...Partly cloudy. Scattered showers and isolated thunderstorms late in the evening. Some thunderstorms may be severe late in the evening. Lows in the lower 60s. Southeast winds 5 to 10 mph late in the evening shifting to the west 5 to 15 mph overnight. Chance of precipitation 50 percent. .SUNDAY...Mostly sunny. Patchy smoke in the late morning and early afternoon. Chance of showers and thunderstorms in the afternoon. Some thunderstorms may produce gusty winds. Highs in the mid 90s. Northwest winds 5 to 10 mph in the morning shifting to the south 5 to 15 mph in the afternoon. Chance of precipitation 30 percent. .SUNDAY NIGHT...Partly cloudy. Chance of showers and slight chance of thunderstorms early in the evening, then chance of showers late in the evening. Some thunderstorms may produce gusty winds early in the evening. Lows in the lower 60s. Southwest winds 5 to 10 mph. Chance of precipitation 30 percent. .MONDAY...Mostly sunny. Highs in the mid 90s. Northwest winds 5 to 10 mph in the morning shifting to the east 5 to 15 mph in the afternoon. .MONDAY NIGHT...Partly cloudy. Slight chance of showers and thunderstorms early in the evening, then slight chance of showers late in the evening. Some thunderstorms may produce gusty winds early in the evening. Lows around 60. South winds 5 to 10 mph in the evening shifting to the northwest overnight. Chance of precipitation 20 percent. .TUESDAY...Sunny. Highs in the upper 90s. .TUESDAY NIGHT...Partly cloudy. Lows around 60. .WEDNESDAY...Sunny. Highs in the mid 90s. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. .THURSDAY...Sunny. Highs in the upper 90s. .THURSDAY NIGHT...Mostly clear. Lows in the lower 60s. .FRIDAY...Sunny. Highs in the upper 90s. .FRIDAY NIGHT...Mostly clear. Lows in the lower 60s. .SATURDAY...Sunny. Highs around 100. $$