Western Pennsylvania will see sharp temperature swings this week, with chilly nights followed by pleasantly warm afternoons. In Pittsburgh, overnight lows will dip into the 40s, while sunshine will push daytime highs well into the 70s through Friday.
Why the Temperatures Are Changing So Much
According to the National Weather Service in Pittsburgh, the region is experiencing larger-than-usual day-to-night temperature differences, ranking in the 90th percentile for this season. The clear skies and dry air allow heat to escape quickly at night, while daytime sunshine warms the region just as fast.
Nights: Cool, with lows in the 40s across much of the area
Afternoons: Warm, with highs in the 70s and near 80 later in the week
Reason: Lack of cloud cover and dry air driving rapid temperature changes
Regional Outlook Across Western Pennsylvania
Different communities will experience the swings a bit differently:
Butler, Indiana, Oil City: Lows in the upper 30s and 40s, with patchy morning fog
Morgantown, Wheeling: Slightly milder nights but still 25–30° swings from morning to afternoon
Pittsburgh metro: 40s at night, mid to upper 70s in the afternoon
Travel and Safety Tips
Residents and commuters should keep these changes in mind:
Watch for patchy fog in valleys during the early morning commute
Dress in layers to stay comfortable between chilly mornings and warm afternoons
Homeowners may want to adjust heating and cooling—blankets at night, fans or AC during the day
Five-Day Forecast for Pittsburgh, PA
| Day | Conditions | Low | High | Notes |
|---|---|---|---|---|
| Monday | Mostly sunny, clear | 50 | 72 | Comfortable, mild evening |
| Tuesday | Cool morning, sunny | 45 | 76 | Big temperature swing |
| Wednesday | Dry, patchy morning fog | 48 | 77 | Fog possible early commute |
| Thursday | Warmer trend continues | 51 | 80 | Warmest day of the week |
| Friday | Dry skies, mild nights | 53 | 79 | Pleasant end to week |
This week in Pittsburgh and across western Pennsylvania will feature a classic fall pattern of chilly mornings and warm, sunny afternoons. Clear skies will keep nights cool, while daytime highs climb comfortably into the 70s and near 80.
Commuters should watch for early morning fog, and residents will need to adjust between cool evenings and warm afternoons. The dry and pleasant stretch continues into the weekend, making it ideal for outdoor plans.
