A HEAT ADVISORY is in effect for eastern Montana until late Wednesday evening.
A RED FLAG WARNING is in effect for portions of southwestern and south-central Montana for Wednesday afternoon and evening.
It was very hot today as highs were in the 90s and 100s. Great Falls topped out at 100° today, making it the hottest day of the year so far and the hottest August 19th on record. For a full recap on today’s heat, head here: https://www.krtv.com/weather/heat-recap-august-19-2025
It will be mild tonight as lows are going to be in the mid to upper 50s and low to mid 60s in most locations. We are also going to have partly cloudy skies tonight with a few scattered showers/storms, generally in western portions of north-central Montana (west of a line from Havre to Lewistown) and along the Hi-Line west of Malta, as a disturbance passes through our area.
Tomorrow will be slightly cooler than today, but still pretty hot as highs are going to be in the mid to upper 80s and low to mid 90s in most spots. We are also going to have mostly sunny skies tomorrow, with the cloud cover increasing during the afternoon and evening. There will also be a few scattered showers and thunderstorms around late tomorrow afternoon, tomorrow evening, and tomorrow night, generally in locations east of I-15, as another disturbance passes through our area.
Check out my forecast to see the timing of the showers and thunderstorms:
It is going to be breezy tomorrow along the Rocky Mountain Front, along the Divide, and along the western half of the Hi-Line (west of Chester) as sustained wind speeds are going to be between 10 and 25 mph. In northeastern Montana, it will be a bit breezy tomorrow as sustained wind speeds are going to be between 10 and 20 mph. Elsewhere, there will just be a little breeze around tomorrow.
There is also going to be some haze around tonight and tomorrow along the Rocky Mountain Front and around Helena, and at times, the air quality may be unhealthy for sensitive groups. This haze is due to smoke from some of the local wildfires, including the Pot Mountain Fire which is burning in the Bob Marshall Wilderness. This fire has burned 92 acres as of Tuesday evening and was putting off a pretty good smoke plume on Tuesday. Elsewhere, it will continue to be a little hazy tonight and tomorrow, but little to no impact to the air quality is expected.
It will be cooler on Thursday and Friday behind a cold front as highs are going to be in the mid to upper 70s and low to mid 80s. We are also going to have mainly sunny skies and mainly dry conditions on these two days. There will also be a bit of a breeze around in some areas on Friday as sustained wind speeds are going to be between 10 and 20 mph.
This weekend will be a beautiful one as we are going to have lots of sunshine, dry conditions, and pleasant temperatures as highs are going to be in the upper 70s and low to mid 80s in most locations. There is also going to be a little bit of a breeze around this weekend as sustained wind speeds are going to be between 5 and 20 mph.
The nice weather sticks around for the beginning of next week as an upper-level ridge remains in control of our weather. On Monday and Tuesday, we are going to have mainly sunny skies, dry conditions, and warm temperatures as highs are going to be in the 80s.
