Certainly not the most usual phenomenon to see in Finland in late Autumn. It was barely over 10 C, VERY windy, rain showers. But the sun came out for a while, and at a perfect moment for me as I was on a bridge with a fabulous view. I was already on the bridge when it appeared, and it made me gasp in awe. This was a bit after 3 pm today. I sure wish I'd been a bit farther away as I couldn't get the entire rainbow to fit in the camera lens: it made a perfect arch over that group of buildings in the picture. Maybe a wideangle lens would've done the same (if I had one). I could of course have tried to take three pictures and then combine them in a panorama, but in my excitement I didn't remember that.
Not the greatest of weathers but I had a fabulous time nevertheless: I walked all the way from my home in eastern Helsinki, along the shores, to the city center - some 9-10 kilometers. I felt almost euphoric when I got to the city, not only because of the rainbow but because the exercise felt so good. I didn't feel tired at all, but invigorated (still do). A long time since I last did this walk.