Have summer rains extended weed spraying window?

We have had good rains all summer and pastures and hayfields that are often brown and dormant this time of year are green and growing.

So are the weeds, and aggressively. Several of the common  local weeds are recommended (by University)  to spray between May and July. Specifically cocklebur, pigweed, ragweed, wild carrot. Question: If they are green and growing will a spray be effective this late?

They are pretty mature, but growing,

Have summer rains extended weed spraying window?