Boston’s run of warm May weather kept going Wednesday, with temperatures returning to the mid-80s for a second straight afternoon before a front pushed through. It was the 13th day this month that temperatures reached 70 degrees or warmer across Greater Boston, and Boston also logged its 6th day of 80-degree weather and its third 90-degree day.

That kind of stretch is not a one-off. Boston has now posted nine consecutive years with at or above normal 70-degree or warmer days, a streak that underscores how persistent the warmth has been in recent springs. This May has already delivered more 80-degree days than average, and the numbers explain why so many people noticed the heat: the month has been unusually active by local standards.

The pattern turns cooler over the next couple of workdays and into the weekend. New England is expected to run five to 10 degrees cooler than average, with Thursday morning temperatures in the upper 50s to low 60s. Thursday afternoon should still feel mild, with the low 70s likely across the interior and the upper 60s at the coast. Boston should stay dry for most of the day, though a quick sprinkle cannot be ruled out.

The bigger change arrives Friday, when a Canadian storm races south into New England. Scattered showers should develop and then turn to steady rain, but Greater Boston is expected to stay dry until around the commute home. By Saturday, showers are expected to stick around through most of the day, keeping the region damp and gray after the recent burst of warmth.

The same system is also setting up a sharper edge farther north. Northern New England could see Saturday morning lows hover near the mid-30s, with a few snowflakes possible in the higher elevations. Portions of Northern New England may pick up up to two inches of rain, while Greater Boston may finish the event with around a half inch by Saturday evening.

The shift is tied to an Omega Block, with a stalled jet stream parked in a way that steers cooler air over the region. That is why the weather boston pattern is changing so quickly after a May that has already featured three 90-degree days and plenty of warmth. The next important change is not whether the region stays warm for long — it is how wet Friday and Saturday become, and whether the rain lands hard enough to matter for the commute and the weekend.