San Francisco is one of the most difficult places to forecast for in California, bracketed alternately by sea and mountains, and set on an undulating peninsula itself. It’s also wonderfully exotic, and among the most interesting places in the world, in my opinion. This could be fun, is what I am saying.

At 156PM, PT, San Francisco was reporting a temperature of 78 degrees under clear skies. A light breeze off the Bay was helping to ensure things remained comfortable, but also was going to be a factor in visibility issues overnight. A ridge was set up across the western US, but had a short enough wavelength that there was no concern yet that this would turn into a long term, problematic feature.
Despite the high pressure through the US, and well agreed upon trough moving through the Pacific Northwest, there is a wide gap in model projections for the San Francisco area. As the low moves into the Northwest, winds will begin southerly tomorrow, and return westerly on Saturday. The southerly winds will bring significantly warmer conditions tomorrow, and the Pacific breezes will cool it right back down for the weekend, all without strong winds or much by way of cloud cover. Guidance is indecisive over how much temperatures will fluctuate, but with wind generally being mild, I’m opting to the more conservative route.
Tomorrow – Sunny and warmer, High 82, Low 53
Saturday – Partly cloudy, High 67, Low 53

TWC: Mostly sunny skies. High 80, Low 49
Saturday – A few clouds early, otherwise mostly sunny. High 65, Low 46

AW: Tomorrow – Very warm with sunshine and patchy clouds High 83, Low 53
Saturday – Sun and areas of high clouds and cooler High 69, Low 51

NWS: Tomorrow – Sunny, High 86, Low 55
Saturday – Mostly sunny, High 70, Low 54

WB: Tomorrow – Sunny, High 79, Low 54
Saturday – Partly cloudy in the morning then becoming sunny, High 67, Low 53

WN: Tomorrow – Mostly sunny, High 85, Low 55
Saturday – Mostly sunny, High 69, Low 54

FIO: Tomorrow – Clear throughout the day. High 83, Low 57
Saturday – Partly cloudy throughout the day. High 64, Low 53

As o e might imagine, the forecasts are all over the map, thanks to the model indecision. One thing that is not all over map, is clouds.