A week that began with a heat wave is about to end with more improved conditions across Massachusetts, but the first hurricane of the season could upend that next week.

Friday night should kick off the weekend with a seasonable “fantastic start” as humidity levels drop and highs reach the high 80s and, along the coast, the high 70s, according to the National Weather Service. Overnight lows should drop to the high 50s and low 60s.

Most of the region continues to be nice on Saturday, with dry conditions and highs in the mid-80s, though the west could see some brief isolated showers, forecasters said. Springfield should see sunny skies, while Pittsfield and Great Barrington could receive some showers between 3 and 5 p.m.

Seasonable conditions could change by Sunday, as a system accompanied

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