All ready for my trip. While the weather is unpredictable, it looks like there will be a lot of rain. Rain is a very good thing for black and white photography, especially if it is windy, stormy, and/or partly clearing. I am not a fan of blue skies with no clouds.
When I was at Seljalandsfoss in May of 2014 I had to constantly wipe off my lens with a microfiber cloth while it rained, but I was able to take some nice images. I used Op/Tech's 18" Rainsleeve, which protected my camera and lens, but made it a little difficult to change my settings. (I use a wireless shutter, as well, all the time.)
For this visit, I will have a rain jacket that fits over the camera and lens and allows me to make any changes to my settings with no difficulty. In addition, I built a little "umbrella" that straps onto my lens over the camera/lens rain jacket so I can shoot in pouring rain or snow and limit the rain drops or snowflakes on my lens, as long as I am not shooting against the wind.
In addition to a lot of rain, the very good news is that the KP index (algorithm for the global geomagnetic activity index) forecast for the time I will be in Iceland is good. One can only hope that the winds are blowing at night long enough to open the cloud coverage so I can shoot images of the northern lights.