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The most probable high temperature in zip code 98102 is 91F for Friday. There is a 1 and 10 chance the high will be lower than 86, and a 1 and 10 chance it will be higher than 96.
The earliest 90+ degree day on record at Sea-tac airport is May 20. The forecast and record highs at Sea-tac are:
Day/forecast high/record high
Thursday/75/85
Friday/92/84
Saturday/85/85
The image is from the UW probcast, at http://probcast.washington.edu/