National Weather Service United States Department of Commerce

Though some variability (seen by distance between the top/bottom of brownish-yellow shading in the chart) is present, temperature through Tuesday likely will fall between the 40s to lower 70s. Cooler weather is favored to end the next work week.
The effects of an Atlantic coastal low and upper level trough will bring rain chances to the region late Saturday and Sunday that favor areas east of I-79. Showers may linger east of Pittsburgh into Tuesday, otherwise the region will be dry to start next week.
Typically the first frost in our region is late September to early October. However, in some unusual weather patterns you can experience frost as early as the 2nd week of September.
NWS Pittsburgh has six regional climate sites: Pittsburgh, PA (KPIT); Wheeling, WV (KHLG); Morgantown, WV (KMGW); Zanesville, OH (KZZV); New Philadelphia, OH (KPHD); and DuBois, PA (KDUJ).