How should I understand temperature and use? it does not above 90 degrees at the time of apply or the temperature above 90*on the day it’s not allowed

Do not apply Ortho Weed B Gon Lawn Weed Control if air temperatures are expected to exceed 90°F. At high, weeds and grasses shut down to protect themselves. This means they will not readily absorb the weed control. High temperatures, also increase the risk for lawn damage.