Fog. (Weather station: Allegheny County Airport, USA). See more current weather Greensburg Extended Forecast with high and low temperatures °F Oct 1 – Oct 7 0.32 Lo:62 Fri, 6 Hi:71 5 0.06 Lo:48 Sat, 7 Hi:61 11 Oct 8 – Oct 14 0.08 Lo:42 Sun, 8 Hi:53 12 0.09 Lo:45 Mon, 9 Hi:57 4 Lo:47 Tue, 10 Hi:61.