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Keystone, PA Weather Forecast


Keystone, PA Weather Forecast Dated: 431 AM Tue Sep 15 2026
Expect a cool pattern with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and a stable pattern will dominate.
Tuesday, September 15, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
61°F 16°C
Partly Cloudy
Refreshing around 67°F 20°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the SE to the SSE at 6 mph 10 km/h.
Wednesday, September 16, 2026
Mid-Morning
60°F 16°C
Overcast
Mid-Afternoon
75°F 24°C
Overcast
Early-Evening
66°F 19°C
Cloudy
Comfortable with temperatures reaching 75°F 24°C, overcast through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
78°F 25°C
Scattered Showers
Early-Evening
70°F 21°C
Scattered Showers
Enjoyable around 78°F 25°C, locally heavy downpours at times, with increasing humidity and barometric pressure falling. Winds switching from the SSW to the N at 3 mph 4 km/h.
Friday, September 18, 2026
Mid-Morning
60°F 16°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
64°F 18°C
Overcast
Mild temperatures up to 74°F 23°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.
Saturday, September 19, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
67°F 19°C
Scattered Showers
Early-Evening
64°F 18°C
Scattered Showers
Refreshing around 67°F 19°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds moving from the ESE to the S at 7 mph 12 km/h. Gusts up to 24 mph 39 km/h.
Sunday, September 20, 2026
Mid-Morning
69°F 20°C
Cloudy
Mid-Afternoon
71°F 22°C
Scattered Showers
Early-Evening
64°F 18°C
Cloudy
Pleasant near 71°F 22°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds swinging from the WSW to the N at 6 mph 9 km/h.
Monday, September 21, 2026
Mid-Morning
60°F 15°C
Scattered Showers
Mid-Afternoon
61°F 16°C
Scattered Showers
Early-Evening
57°F 14°C
Overcast
Comfortable at 61°F 16°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Tuesday, September 22, 2026
Mid-Morning
57°F 14°C
Scattered Showers
Mid-Afternoon
56°F 13°C
Light Showers
Early-Evening
57°F 14°C
Light Showers
Crisp with a high near 56°F 13°C, scattered downpours possible, with steady humidity and steady pressure. Winds blowing from the SE at 12 mph 20 km/h. Gusts up to 31 mph 50 km/h.
Wednesday, September 23, 2026
Mid-Morning
63°F 17°C
Light Fog
Mid-Afternoon
70°F 21°C
Scattered Showers
Early-Evening
68°F 21°C
Fog
Mild temperatures up to 70°F 21°C, locally heavy downpours at times, with steady humidity and steady pressure.
Thursday, September 24, 2026
Mid-Morning
63°F 17°C
Light Showers
Mid-Afternoon
65°F 18°C
Light Fog
Early-Evening
62°F 17°C
Fog
Mildly cool near 65°F 18°C, early showers breaking for a drier afternoon, with steady humidity and steady pressure.
Friday, September 25, 2026
Mid-Morning
56°F 14°C
Overcast
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
56°F 13°C
Overcast
Comfortable at 63°F 17°C, overcast in the morning, becoming cloudy through the afternoon and evening, with lower humidity and barometric pressure rising. Winds turning from the WNW to the NNW at 5 mph 8 km/h.
Saturday, September 26, 2026
Mid-Morning
51°F 10°C
Cloudy
Mid-Afternoon
62°F 17°C
Overcast
Early-Evening
55°F 13°C
Overcast
Cool with a high near 62°F 17°C, overcast throughout the day, with steady humidity and steady pressure.
Sunday, September 27, 2026
Mid-Morning
49°F 9°C
Sunny
Mid-Afternoon
60°F 16°C
Sunny
Early-Evening
53°F 11°C
Overcast
Refreshing around 60°F 16°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds switching from the N to the ESE at 8 mph 13 km/h.
Monday, September 28, 2026
Mid-Morning
46°F 8°C
Sunny
Mid-Afternoon
58°F 15°C
Partly Cloudy
Early-Evening
51°F 10°C
Partly Cloudy
Mildly cool near 58°F 15°C, partly cloudy in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure.
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