NWSL is implementing new guidelines for extreme heat, including procedures for match delays, effective immediately. You can read those guidelines here. 

Here are the Thorns matches that will now have a different start time:

Saturday, July 15
Portland Thorns FC vs. North Carolina Courage
Providence Park
12:30 Pacific

Saturday, August 5
Portland Thorns FC vs. Houston Dash
Providence Park
12:30 Pacific

Saturday, September 2
Portland Thorns FC vs. Washington Spirit
Providence Park
12:30 Pacific

Saturday, September 23
Orlando Pride vs. Portland Thorns FC
Orlando City Stadium
12:30 Pacific

Saturday, September 30
Portland Thorns FC vs. Chicago Red Stars
Providence Park
12:30 Pacific