Chilly Evening Forecast with Freeze Watch for Tuesday Morning in South-Central PA
Unseasonably cool air has settled over south-central Pennsylvania after a cold front moved through this morning. A Freeze Watch is in effect for Monday night into Tuesday morning for the Susquehanna Valley and surrounding counties. Filmogaz.com reports the advisory covers the period from 12 a.m. to 9 a.m. Tuesday.
Tonight and Monday
Skies cleared this afternoon with brief sunshine and a few stray showers. Winds have been breezy, generally 15 to 25 mph, and will ease to 5 to 15 mph tonight. Temperatures are falling into the upper 40s and will drop into the upper 30s overnight.
Monday will be the coolest day of the short term. Expect highs near the upper 40s under a mix of clouds and sun.
Freeze Watch details
The National Weather Service issued the freeze watch for the Susquehanna Valley. The watch runs from 12 a.m. Tuesday to 9 a.m. Tuesday. Overnight lows could reach the upper 20s to low 30s across much of the area.
Residents should protect tender plants, crops, and potted vegetation before the cold arrives. Bring pots indoors or cover vulnerable landscaping.
Current conditions and locations
Temperatures this evening vary across the region. Harrisburg measured 54 degrees, Lewistown 50, Chambersburg 57, and Gettysburg 61 at the latest check.
| Location | Current Temp (°F) |
|---|---|
| Harrisburg | 54 |
| Lewistown | 50 |
| Chambersburg | 57 |
| Gettysburg | 61 |
Extended outlook
Tuesday will remain unseasonably cool with highs in the mid to upper 50s and a light breeze. By Wednesday, milder air returns with highs near 70 and a chance of morning showers. Thursday and Friday look warmer, with highs in the mid to upper 70s.
Showers may return Saturday into Sunday. Highs will fall to the mid 60s by Sunday.
Health and outdoor notes
Pollen levels are expected to be very high on Monday afternoon. Mold levels remain low and air quality is good. The UV index will be moderate, with about a 40-minute burn time during peak sun.
Filmogaz.com meteorologist Ryan provided this update. The report was last updated Apr 19, 2026 at 5:37 PM EDT.
