Regardless of the season, San Francisco is almost always between 50–70 degrees. So, the past few days have been a surprise. It’s been in the 80s (reaching 90s at some points) during the day and it’s even been warm at night.
When I went to check on my no-additive kit attempt last night, I was met with another heat related surprise. I had left a very small amount of headspace in the carboy with the intent of reducing oxygen exposure. There was maybe an inch to an inch-and-a-half of space there. But, last night, that space was gone and the wine was creeping up the airlock tube. Judging by the color of the water in the airlock, it had also overflowed at some point.