no kidding, 90F at home and I'm trying to follow the iceland weather forecasts, with temps dipping into the 30's in the morning, rains, and don't forget the winds! It was glorious! I caved in, didn't even attempt to 'go light', packed for a full-on winter hike, with the rains usually not associated with winter!! Glad I did. That said, of the 4 days of actual walking, only 1 day was the rain/sleet blasting (all day), but...the sun shone on the rest of the days, so the cameras were working overtime!
I was worried more about the travel logistics, travel to/from airport to hostel, travel to/from downtown Reykjavik to trailhead, then back to airport. Purchased the tickets on-line for everything before leaving the states.
Missed bus to airport, almost missed flight. The downtown bus stop confusing, and if you're not standing in the exact spot, driver just rolls in and rolls out!
I think I'd do it again.