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Grantham, PA Weather Forecast

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Grantham, PA Weather Forecast

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Grantham PA weather - Clear - 66°F
Clear
66°F
Updated 11:13 pm
Feels Like 58°F
Humidity 56%
Wind SSE 7 mph
Barometer  30.32 in
Dew Point 50°F
Grantham PA weather - Clear - 19°C
Clear
19°C
Updated 11:13 pm
Feels Like 15°C
Humidity 56%
Wind SSE 11 km/h
Barometer  102.7 kPa
Dew Point 10°C
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Grantham Weather Forecast

OVERNIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY
Grantham, PA Weather - Overnight Mostly Clear Grantham, PA Weather - Wednesday Patchy Fog Grantham, PA Weather - Wednesday Night Partly Cloudy Grantham, PA Weather - Thursday Showers Likely Grantham, PA Weather - Thursday Night Chance Of T-Storm Grantham, PA Weather - Friday Mostly Sunny Grantham, PA Weather - Friday Night Partly Cloudy Grantham, PA Weather - Saturday Mostly Sunny Grantham, PA Weather - Saturday Night Chance Of Showers Grantham, PA Weather - Sunday Showers Likely Grantham, PA Weather - Sunday Night Showers Grantham, PA Weather - Monday Chance Of Showers
Mostly Clear Patchy Fog Partly Cloudy Showers Likely Chance of T-Storm Mostly Sunny Partly Cloudy Mostly Sunny Chance of Showers Showers Likely Showers Chance of Showers
Lo: 51°FLo: 11°C Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C Hi: 85°FHi: 29°C
 Lo: 69°FLo: 21°C Hi: 80°FHi: 27°C
 Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
 Lo: 61°FLo: 16°C Hi: 79°FHi: 26°C
 Lo: 61°FLo: 16°C Hi: 75°FHi: 24°C
POP: 70% POP: 70% POP: 50% POP: 70% POP: 70% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 1030 PM EDT Tue Sep 15 2026 Grantham, PA Weather - WeatherWorld.com

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Grantham Forecast Discussion

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Issued: 742 PM EDT Tue Sep 15 2026

Key Messages

1) Warmer and more humid conditions return into midweek with highest odds for rain Thursday


Discussion

... KEY MESSAGE 1: Warmer and more humid conditions return into midweek with highest odds for rain Thursday

Latest CAMs support a modest increase in POPs across the northern tier of CPA late tonight into early Wednesday morning. Temps, dewpoints, and precip probs trend higher on Wednesday and peak on Thursday. A weak frontal boundary sinking southeast from the Lower Great Lakes will in...