Yes the month of August does always have 31 days in the month.
August and July both have 31 days in them.
The month of August which always has 31 days is the eighth month of the year in the Gregorian calendar, coming between July and September,
July is the 7th month in the calendar that comes before August.
The month of August also always ends on the same day of the week as the month of November.
Some months have less days than other months but July and August both have the same amount of days in them.