According to www.cruisingearth.com, the Sky is heading to Southampton right now, so not going to Reykjavik.
This was the original schedule, I think:
Akureyri, Iceland (20 May 0800-2000);
Isafjord, Iceland (21 May 0900-1900);
Grundarfjordur, Iceland (22 May 0800-1800);
Reykjavik, Iceland (23 May 0700-2000);
There's a company that sells home weather stations that, by default, weather data, including historical weather data, gets shared. It's called ambientweather.net.
Here's what one weather station recorded as the wind speed and direction in Akureyri on 5/20:
So in the morning, there was 7 to 14 mph with gusts as high as 26mph. Afternoon and evening was less windy.