CHESTER COUNTY, PA — Chester County begins the week on Sunday, January 11, 2026, with a volatile mix of sun, wind, and late-day precipitation that signals a more unsettled stretch of winter weather ahead.
Sunday starts mostly sunny, but by early afternoon rain showers move in, briefly mixing with snow after 3 p.m. as colder air sweeps across the region. Highs reach near 43, but strong west winds of 10 to 15 mph — with gusts up to 30 mph — will make it feel colder. Any snow accumulation should be negligible. Skies clear overnight, but temperatures fall sharply to around 27, with gusts reaching 35 mph.
Monday brings a calmer but still brisk day, with sunshine returning and highs near 42. Winds ease slightly but remain out of the west. Monday night stays partly cloudy and cold, with lows again near 27.
Tuesday marks the warmest day of the week. Abundant sunshine and a southwest breeze push highs into the upper 40s, peaking around 47. Clouds increase Tuesday night, and temperatures hold milder, near 37.
By Wednesday, the atmosphere turns unsettled again. Thick clouds dominate, and scattered rain showers develop during the afternoon, continuing into the evening. Daytime highs climb to about 49 before colder air moves back in overnight, dropping temperatures to near 29.
Thursday brings the week’s most complex weather pattern. Light rain is likely in the morning, then a rain-and-snow mix develops as temperatures fall. Highs struggle to reach 37, and by nightfall colder air locks in with lows plunging to around 19. While precipitation chances remain moderate, even light wintry accumulation could create slick travel conditions.
Friday and Saturday look drier but colder. Friday stays partly sunny with a high near 34, then dips to around 21 at night. Saturday brings more sunshine and a modest rebound to about 38, offering a quieter close to the week.
This week’s forecast highlights classic mid-January volatility — warm air surges, sharp cold fronts, and fast-moving systems that can change conditions in a matter of hours. For real-time radar, detailed hourly updates, and storm tracking tools, visit the MyChesCo Weather Center and stay ahead of whatever winter throws at Chester County next.
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