I was in the pattern that night. The winds were quite high, gusting to 37kts, with a 30 kt crosswind component. Several aircraft went around at BFI and SEA. We didn't even start the approach because it exceeded our 21kt crosswind limit. We entered a holding pattern just northwest of the field to wait in case the winds died down. When approach control told us the runway was now closed, we diverted to Bellingham.