Residents of Central Pennsylvania can look forward to an unseasonably warm start to the weekend, with temperatures reaching above-average highs before a change in the weather pattern. The northern parts will enjoy temperatures around 70 degrees, while the southern areas, including Harrisburg, are expected to experience highs exceeding 80 degrees, with Harrisburg itself projected to reach 83 degrees today.
The weekend’s warmth will be accompanied by clear skies, but by Sunday night, conditions will begin to shift. An easterly flow will introduce increased moisture, resulting in low clouds and a chance of fog, while overnight temperatures rise, settling in the 60s.
Significant weather changes are anticipated at the beginning of the week as a frontal system moves in on Monday and Tuesday. This system is set to bring widespread rain across the region, with the northwestern half of Central Pennsylvania having the highest likelihood of precipitation. Rain is predicted to extend throughout the entire region by late Tuesday, bringing cooler temperatures.
As the rain sets in, temperatures will start to decrease, gradually aligning with the seasonal averages typical for late September. Expectations are for highs to fall into the mid-60s to mid-70s. This weather change coincides with the arrival of the autumn equinox at 2:10 p.m. on Monday, September 22.
This weather forecast was initially drafted using generative AI technology and subsequently reviewed and refined by the editorial team at PennLive.com.