Actually both 10-day Canadian (GDPS) and U.S. (GFS) show seasonal temperatures for Halifax, and the rest of the Maritimes.
https://spotwx.com/
But yeah not expecting a lot of high 20's heading into fall.
Should be interesting if we can keep this record going:
https://twitter.com/YHZ_Weather/status/1041667451556126720
And the next two hot humid days should let us top this all time record for humidex ≥30:
EDIT: already hit Humidex 30 C today
https://twitter.com/YHZ_Weather/status/1041710620213690368