conditional formating for weekends in the matrix visual

Anonymous , Create a measure like this checking the weekday value

if(FIRSTNONBLANK(Table[Value],"true") = "true","green","red")

or

if(FIRSTNONBLANK(Table[Weekday],"AnyDay") in {"sun","sat"},"green","red")

And the in conditional formatting use field option with this measure

Steps :

https://radacad.com/dax-and-conditional-formatting-better-together-find-the-biggest-and-smallest-numbers-in-the-column
https://docs.microsoft.com/en-us/power-bi/desktop-conditional-table-formatting#color-by-color-values

HI Anonymous,

You can use below measure formula to add a measure and setting condition formation on your value field based on measure result:

Measure =
VAR currDay =
    MAX ( 'Table'[Day] )
VAR currDate =
    DATEVALUE ( currDay & "-" & MAX ( 'Table'[Month] ) )
RETURN
    IF ( WEEKDAY ( currDate, 2 ) > 5, "Blue", "Black" )

Since I'm not so sure your table structure, can you please share some dummy data with a similar datas tucute and visual design to help us clarify your scenario?

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Regards,

Xiaoxin Sheng