Same problem here in San Mateo. I'm hoping for a September heat wave.

Berkeley has hardly been over 70 degrees.
Tumbling Tom in ground is about 8 feet across, but set few fruit, and I ate one about August 1.
San Francisco Fog should have first ripe fruit in a week.
Black Plum looks like it might have a ripe tomato in 2 weeks.
Last year the Black Plum got ripe around July 10 and had the best production.
It would be good to find out what varieties we all planted and what results in case we get more summers like this.

Under a continuous ocean breeze and overcast until lately, tomatoes have been slow to ripen, or even set for many varieties. First to ripen were Stupice and Glacier, Ding Wall Scotty, Kosovo, Vorlon, J.D. Special C-Tex and of course Early Girl. Close behind were many of the small fruited black varieties like Black Trifele. Huang se Chieh came ripe early even though it has a 80 day maturity rating. Surprisingly my San Francisco Fog are ripening later than the above, but ripening quickly now that we are having some summer heat as is Bloody Butcher. Lancaster Pink started coming ripe a few weeks ago, is very early for a vigorous, large fruited type. Lots of Lemon Boy coming ripe these last two weeks.

My recommendation for cool areas would be Stupice and Glacier for small fruited types, Lemon Boy and Early Girl for medium size fruit, Kosovo and Lancaster pink for larger fruits.