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Pittsburgh, PA Weather: Frost Followed by 68° October 20
Pittsburgh, PA – A widespread early season freeze threatens portions of western Pennsylvania early Sunday, October 18, as temperatures plunge below freezing across Pittsburgh and surrounding communiti
By Avery Collins · 2026-10-17T23:49:37.803Z
Pittsburgh, PA – A widespread early season freeze threatens portions of western Pennsylvania early Sunday, October 18, as temperatures plunge below freezing across Pittsburgh and surrounding communities. The National Weather Service has issued a Freeze Warning covering a broad area of the region, with temperatures expected to fall into the upper 20s to around 30 degrees. The cold could damage sensitive vegetation before a significant warmup brings afternoon temperatures back into the upper 60s early next week.
According to the National Weather Service in Pittsburgh, the Freeze Warning remains in effect from 1 a.m. until 9 a.m. Sunday. The alert includes portions of western Pennsylvania, eastern Ohio and northern West Virginia, with subfreezing temperatures capable of killing crops and other sensitive vegetation.
Freeze Warning Covers Pittsburgh and Surrounding Counties The warning includes Allegheny, Beaver, Butler, Washington, Westmoreland and other western Pennsylvania counties, along with neighboring communities across state lines.
Forecasters expect temperatures to fall into the upper 20s to around 30 degrees, creating conditions favorable for widespread frost and freezing temperatures.
Residents with gardens, outdoor plants or remaining seasonal crops should take protective measures before temperatures drop overnight.
The National Weather Service specifically advises residents to protect tender plants from the cold.
Cold Morning Followed by Significant Warmup Pittsburgh's forecast calls for temperatures near 30 degrees Saturday night, with widespread frost developing mainly after 4 a.m. Sunday.
Frost could continue until approximately 9 a.m. before sunshine helps temperatures rebound to around 61 degrees during the afternoon.
Another round of patchy frost is possible early Monday, when temperatures are expected to fall to approximately 36 degrees before warming to around 66 degrees.
By Tuesday, Pittsburgh could reach 68 degrees, representing a 38 degree difference from Saturday night's forecast low.
Five Day Pittsburgh Weather Outlook Tuesday, October 20: Sunny skies are expected across Pittsburgh, with afternoon temperatures reaching approximately 68 degrees before mostly clear nighttime conditions bring temperatures down to around 40 degrees.
Wednesday, October 21: Sunshine continues across western Pennsylvania, with temperatures reaching near 67 degrees before falling to approximately 40 degrees overnight under mostly clear skies.
Thursday, October 22: Sunny conditions are forecast with a high near 68 degrees, followed by mostly clear nighttime weather and temperatures dropping to around 44 degrees.
Friday, October 23: Another sunny afternoon is expected, with temperatures reaching approximately 65 degrees before cooling to around 42 degrees overnight under mostly clear skies.
Saturday, October 24: Sunshine should continue across Pittsburgh, with afternoon temperatures reaching approximately 66 degrees, maintaining the relatively mild autumn pattern.
What Residents Should Know The immediate concern is the overnight freeze, especially for gardeners, farmers and residents with temperature sensitive plants.
Outdoor vegetation may suffer damage when temperatures remain below freezing, even if warmer conditions return later in the day.
Residents should cover vulnerable plants or move containers indoors before the warning begins.
Extended Outlook: October 25 26 The available National Weather Service forecast extends through Saturday, October 24. Specific temperatures, precipitation probabilities and sky conditions for October 25 26 are not provided.
Residents should continue monitoring updated forecasts for changes.
For now, the most significant weather development remains the Freeze Warning through Sunday morning, followed by a substantial temperature rebound that could bring Pittsburgh close to 70 degrees Tuesday.