• August 1 – The Helena rodeo opened.
• August 2 – Miners Field Day was celebrated in Butte.
• August 7 – The 13th annual Northern Montana Fair opened to record attendance in Great Falls. A pilot died when his A-20 crashed 14 miles from Great Falls.
• August 8 – A woman taxi driver was beaten and robbed of $33 in Great Falls.
• August 13 – The Midland Empire Fair opened in Billings. A strike closed the Pierce Packing Co. in Billings after the company hired a non-union carpenter. The company sued the union for $150,000 damages.
• August 14 – The Cole Brothers Circus performed in Great Falls.
• August 15 – Three drowned in the Thompson River.
• August 18 – Five–year–old Charlie Crocker of Great Falls was flown to St. Louis for emergency surgery to remove a tooth stuck in his bronchial passage.
• August 22 – State Treasurer Thomas E. Carey was found dead of an apparent heart attack in a Spokane hotel room.
• August 23 – The week-long Pierce Packing strike ended in Billings after the company fired the non-union carpenter whose hiring led to the strike.
• August 25 – French and American troops entered Paris.
• August 29 – Soviet and Polish authorities revealed the atrocities committed by the Nazis at Majdanek concentration camp, where 1.5 million people were murdered.