These are the only temperature restrictions listed on the Manufacturer’s label:

“Do not pour spray solution near susceptible plants. Do not spray on carpetgrass, dichondra nor on lawns or turf where desirable clovers are present. Except as noted, use only lawn-type sprayers. Coarse sprays are less likely to “wind-drift”. Use coarse spray droplets. Do not spray roots of ornamentals and trees. Do not exceed specified dosages for any area; be particularly careful within the dripline of trees and other species. Do not apply to newly seeded grasses until well established. Avoid broadcast applications when air temperature exceeds 90 degrees. When using small, spot treatment applications in temperature over 90 degrees, turf injury may occur.

When treating Carpetgrass, avoid broadcast applications when air temperature exceeds 80 degrees. When air temperatures exceed 80 degrees, limit application to spot treatment only.
Apply only to dormant St. Augustine (Common, Raleigh and Seville varieties grown in Texas, Louisiana, Mississippi only) and dormant Centipede grasses (Texas, Louisiana, Mississippi only).
Avoid applying during excessively dry or hot periods unless irrigation is used.

For optimum results:
(1) turf should not be mowed for 1 to 2 days before and after application;
(2) do not apply if rain is expected within 4 hours after the application, delay irrigation cycle for 24 hours. Reseed no sooner than three to four weeks after application of this product. Failure to observe all precautions may result in injury to turf and/or susceptible plants.”