Currently: 45 °F. Sunny. (Weather station: New Castle, New Castle Municipal Airport, USA). See more current weatherBorough of Mercer Extended Forecast with high and low temperatures
2 Week Extended Forecast in Borough of Mercer, Pennsylvania, USA
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| Conditions | Comfort | Precipitation | Sun | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day | Temperature | Weather | Feels Like | Wind | Humidity | Chance | Amount | UV | Sunrise | Sunset | ||
| Wed Dec 17 |  | 40 / 27 °F | Overcast. | 32 °F | 8 mph | ↑ | 70% | 3% | 0.00" | 0 (Low) | 7:40 am | 4:53 pm |
| Thu Dec 18 |  | 48 / 27 °F | Showers late. Mostly cloudy. | 42 °F | 13 mph | ↑ | 59% | 64% | 0.17" | 0 (Low) | 7:41 am | 4:53 pm |
| Fri Dec 19 |  | 43 / 19 °F | Rain changing to snow. Overcast. | 6 °F | 20 mph | ↑ | 75% | 94% | 1.59" | 0 (Low) | 7:42 am | 4:54 pm |
| Sat Dec 20 |  | 37 / 17 °F | Light snow late. Overcast. | 23 °F | 12 mph | ↑ | 52% | 21% | 0.08" | 0 (Low) | 7:42 am | 4:54 pm |
| Sun Dec 21 |  | 36 / 23 °F | Partly cloudy. | 26 °F | 10 mph | ↑ | 52% | 1% | 0.00" | 0 (Low) | 7:43 am | 4:55 pm |
| Mon Dec 22 |  | 28 / 17 °F | Broken clouds. | 22 °F | 4 mph | ↑ | 60% | 2% | 0.00" | 0 (Low) | 7:43 am | 4:55 pm |
| Tue Dec 23 | | 36 / 17 °F | Light snow late. Overcast. | 26 °F | 9 mph | ↑ | 75% | 38% | 1.12" | 0 (Low) | 7:44 am | 4:56 pm |
| Wed Dec 24 | | 38 / 33 °F | Overcast. | 32 °F | 4 mph | ↑ | 71% | 39% | 0.09" | 0 (Low) | 7:44 am | 4:56 pm |
| Thu Dec 25 |  | 41 / 35 °F | Rain early. Cloudy. | 39 °F | 4 mph | ↑ | 98% | 75% | 0.69" | 0 (Low) | 7:44 am | 4:57 pm |
| Fri Dec 26 | | 38 / 34 °F | Light mixture of precip. Overcast. | 29 °F | 15 mph | ↑ | 78% | 45% | 0.09" | 0 (Low) | 7:45 am | 4:58 pm |
| Sat Dec 27 | | 34 / 24 °F | Light snow. Cloudy. | 14 °F | 19 mph | ↑ | 86% | 56% | 2.19" | 0 (Low) | 7:45 am | 4:58 pm |
| Sun Dec 28 | | 31 / 20 °F | Light snow. Overcast. | 10 °F | 11 mph | ↑ | 87% | 55% | 1.67" | 0 (Low) | 7:45 am | 4:59 pm |
| Mon Dec 29 | | 21 / 13 °F | Light snow. Decreasing cloudiness. | 13 °F | 6 mph | ↑ | 85% | 44% | 0.85" | 0 (Low) | 7:46 am | 5:00 pm |
| Tue Dec 30 | | 23 / 8 °F | Sunny. | 17 °F | 4 mph | ↑ | 88% | 3% | 0.00" | 0 (Low) | 7:46 am | 5:01 pm |
| Wed Dec 31 | | 29 / 5 °F | Sunny. | 28 °F | 2 mph | ↑ | 81% | 1% | 0.00" | 0 (Low) | 7:46 am | 5:01 pm |
| * Updated Wednesday, December 17, 2025 10:24:03 am Borough of Mercer time - Weather by CustomWeather, © 2025 | ||||||||||||