Low Covid-19 risk in Custer, Montana.
Low Flu risk in Custer, Montana.
Low Rsv risk in Custer, Montana.
Low Infectious risk in Custer, Montana.
Low Allergy risk in Custer, Montana.
Low Pollution risk in Custer, Montana.
Moderate Weather activity in Custer, Montana.
Last updated: April 20, 2026
Data refreshed weekly