I've been in Stockholm, southern Finland and now Estonia since June 15. I think I've had 2 or 3 days that broke 80F. I certainly have no complaints.
If it rains, the temperature's likely to cool off a good bit, so getting really wet when wearing lightweight summer clothes is something I'm trying to avoid. I look at the weather forecast every day and usually see a possibility of rain at some point, so I drag my rain jacket around with me more days than not. My umbrella is a nice, light one, but still a lot heavier than the jacket, so it spends more time in my hotel room, sometimes to my regret. A lot of days with rain are just a matter of intermittent light showers, but you can also get rather heavy rain.
This year in Finland I had some days when there were periods of really chilly wind (it felt Siberian) despite supposed temperatures around 70F. I don't remember encountering that phenomenon last year while I was in Norway, Sweden and Helsinki.
On the other hand, in Tallinn there were a couple of cloudy days with reported temperatures in the 60s when the sun felt quite hot when it came out from behind the clouds. It seemed I was constantly adding or subtracting a layer.
I didn't notice it in the other northern countries, but I feel as if I'm getting some stares here in Estonia. It's happening outdoors, so there's no mask involved. It's either my hat or my long sleeves. The locals evidently aren't worried about getting too much sun; they probably need the Vitamin D.