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Grantham PA Weather - Clear - 75°F
Clear
75°F
Updated 4:44 pm
Feels Like 70°F
Humidity 41%
Wind VRB 7 mph
Barometer  30.32 in
Dew Point 50°F
Grantham PA Weather - Clear - 24°C
Clear
24°C
Updated 4:44 pm
Feels Like 21°C
Humidity 41%
Wind VRB 11 km/h
Barometer  102.7 kPa
Dew Point 10°C
Grantham, PA Weather and Current Conditionsgrantham pa weather forecast

Grantham, PA Weather Forecast

Grantham Pennsylvania WeatherGrantham, Pennsylvania Weather Weather Forecast
14 day API Grantham, PA weather forecast. Note. Our 7-day weather forecast for Grantham, Pennsylvania is our most reliable and accurate forecast. This model should only be used as a likely scenario. Forecasting more than 7 days is difficult.
Grantham, PA Weather Forecast Dated: 444 PM Tue Sep 15 2026
Expect a mild stretch with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.

Tuesday, September 15, 2026

Mid-Morning
Grantham Weather - 2026-09-15 - Morning - Sunny
57°F 14°C
Sunny
Mid-Afternoon
Grantham Weather - 2026-09-15 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
Grantham Weather - 2026-09-15 - Evening - Cloudy
69°F 21°C
Cloudy
Pleasant near 75°F 24°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.

Wednesday, September 16, 2026

Mid-Morning
Grantham Weather - 2026-09-16 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
Grantham Weather - 2026-09-16 - Afternoon - Partly Cloudy
83°F 28°C
Partly Cloudy
Early-Evening
Grantham Weather - 2026-09-16 - Evening - Cloudy
78°F 26°C
Cloudy
Balmy with temperatures reaching 83°F 28°C, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.

Thursday, September 17, 2026

Mid-Morning
Grantham Weather - 2026-09-17 - Morning - Partly Cloudy
66°F 19°C
Partly Cloudy
Mid-Afternoon
Grantham Weather - 2026-09-17 - Afternoon - Overcast
86°F 30°C
Overcast
Early-Evening
Grantham Weather - 2026-09-17 - Evening - Scattered Showers
78°F 26°C
Scattered Showers
Quite warm around 86°F 30°C, locally heavy downpours at times, with steady humidity and barometric pressure falling.

Friday, September 18, 2026

Mid-Morning
Grantham Weather - 2026-09-18 - Morning - Partly Cloudy
70°F 21°C
Partly Cloudy
Mid-Afternoon
Grantham Weather - 2026-09-18 - Afternoon - Overcast
80°F 26°C
Overcast
Early-Evening
Grantham Weather - 2026-09-18 - Evening - Sunny
71°F 22°C
Sunny
Warm temperatures up to 80°F 26°C, partly cloudy in the morning, overcast in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds turning from the N to the NNE at 11 mph 17 km/h.

Saturday, September 19, 2026

Mid-Morning
Grantham Weather - 2026-09-19 - Morning - Sunny
59°F 15°C
Sunny
Mid-Afternoon
Grantham Weather - 2026-09-19 - Afternoon - Cloudy
72°F 22°C
Cloudy
Early-Evening
Grantham Weather - 2026-09-19 - Evening - Overcast
65°F 18°C
Overcast
Mild with a high of 72°F 22°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with increasing humidity and barometric pressure falling. Winds blowing from the SSE at 8 mph 13 km/h.

Sunday, September 20, 2026

Mid-Morning
Grantham Weather - 2026-09-20 - Morning - Scattered Showers
67°F 19°C
Scattered Showers
Mid-Afternoon
Grantham Weather - 2026-09-20 - Afternoon - Scattered Showers
63°F 17°C
Scattered Showers
Early-Evening
Grantham Weather - 2026-09-20 - Evening - Scattered Showers
61°F 16°C
Scattered Showers
Mildly cool near 63°F 17°C, locally heavy downpours at times, with steady humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
Grantham Weather - 2026-09-21 - Morning - Scattered Showers
61°F 16°C
Scattered Showers
Mid-Afternoon
Grantham Weather - 2026-09-21 - Afternoon - Overcast
72°F 22°C
Overcast
Early-Evening
Grantham Weather - 2026-09-21 - Evening - Scattered Showers
67°F 19°C
Scattered Showers
Comfortable with temperatures reaching 72°F 22°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.

Tuesday, September 22, 2026

Mid-Morning
Grantham Weather - 2026-09-22 - Morning - Light Fog
61°F 16°C
Light Fog
Mid-Afternoon
Grantham Weather - 2026-09-22 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
Grantham Weather - 2026-09-22 - Evening - Scattered Showers
66°F 19°C
Scattered Showers
Cool with a high near 65°F 18°C, scattered downpours possible, with steady humidity and steady pressure.

Wednesday, September 23, 2026

Mid-Morning
Grantham Weather - 2026-09-23 - Morning - Fog
64°F 18°C
Fog
Mid-Afternoon
Grantham Weather - 2026-09-23 - Afternoon - Light Showers
65°F 19°C
Light Showers
Early-Evening
Grantham Weather - 2026-09-23 - Evening - Scattered Showers
62°F 17°C
Scattered Showers
Refreshing around 65°F 19°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds moving from the E to the ENE at 10 mph 16 km/h. Gusts up to 23 mph 38 km/h.

Thursday, September 24, 2026

Mid-Morning
Grantham Weather - 2026-09-24 - Morning - Light Showers
62°F 17°C
Light Showers
Mid-Afternoon
Grantham Weather - 2026-09-24 - Afternoon - Fog
63°F 17°C
Fog
Early-Evening
Grantham Weather - 2026-09-24 - Evening - Fog
66°F 19°C
Fog
Mildly cool near 63°F 17°C, early showers breaking for a drier afternoon, with steady humidity and barometric pressure falling. Winds swinging from the ENE to the E at 5 mph 7 km/h.

Friday, September 25, 2026

Mid-Morning
Grantham Weather - 2026-09-25 - Morning - Scattered Showers
70°F 21°C
Scattered Showers
Mid-Afternoon
Grantham Weather - 2026-09-25 - Afternoon - Light Showers
71°F 22°C
Light Showers
Early-Evening
Grantham Weather - 2026-09-25 - Evening - Light Showers
69°F 21°C
Light Showers
Pleasant near 71°F 22°C, scattered downpours possible, with steady humidity and barometric pressure falling. Winds shifting from the SSE to the SE at 16 mph 26 km/h. Gusts up to 36 mph 57 km/h.

Saturday, September 26, 2026

Mid-Morning
Grantham Weather - 2026-09-26 - Morning - Overcast
68°F 20°C
Overcast
Mid-Afternoon
Grantham Weather - 2026-09-26 - Afternoon - Overcast
74°F 23°C
Overcast
Early-Evening
Grantham Weather - 2026-09-26 - Evening - Overcast
70°F 21°C
Overcast
Comfortable with temperatures reaching 74°F 23°C, overcast throughout the day, with lower humidity and steady pressure. Winds turning from the WSW to the W at 8 mph 12 km/h.

Sunday, September 27, 2026

Mid-Morning
Grantham Weather - 2026-09-27 - Morning - Overcast
58°F 14°C
Overcast
Mid-Afternoon
Grantham Weather - 2026-09-27 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
Grantham Weather - 2026-09-27 - Evening - Overcast
61°F 16°C
Overcast
Refreshing around 65°F 18°C, overcast throughout the day, with lower humidity and steady pressure. Winds out of the NNW at 11 mph 18 km/h.

Monday, September 28, 2026

Mid-Morning
Grantham Weather - 2026-09-28 - Morning - Sunny
52°F 11°C
Sunny
Mid-Afternoon
Grantham Weather - 2026-09-28 - Afternoon - Sunny
62°F 17°C
Sunny
Early-Evening
Grantham Weather - 2026-09-28 - Evening - Sunny
57°F 14°C
Sunny
Mildly cool near 62°F 17°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the NNW to the N at 10 mph 16 km/h. Gusts up to 22 mph 35 km/h.

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Weather by the Numbers

Tue, 15th
Grantham PA Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 76°F 24°C
Lo: 51°F 10°C
Sunrise 06:48 AM
Sunset 07:16 PM
Wind SSE 6 mph9 km/h
Dew Point 43°F6°C
uv Index 6
Barometric Pressure 30.36 in1028 mb
POP 1% *
Humidity 39%
Wed, 16th
Grantham PA Weather - Wednesday, Sep 16, 2026 - Sunny
Hi: 84°F 29°C
Lo: 57°F 14°C
Sunrise 06:49 AM
Sunset 07:15 PM
Wind SSW 7 mph12 km/h
Dew Point 55°F13°C
uv Index 6
Barometric Pressure 30.33 in1027 mb
POP 2% *
Humidity 47%
Thu, 17th
Grantham PA Weather - Thursday, Sep 17, 2026 - Patchy Rain Nearby
Hi: 86°F 30°C
Lo: 65°F 18°C
Sunrise 06:50 AM
Sunset 07:13 PM
Wind SW 7 mph12 km/h
Dew Point 61°F16°C
uv Index 6
Barometric Pressure 30.21 in1023 mb
POP 11% *
Humidity 51%
Fri, 18th
Grantham PA Weather - Friday, Sep 18, 2026 - Cloudy
Hi: 80°F 26°C
Lo: 60°F 16°C
Sunrise 06:51 AM
Sunset 07:11 PM
Wind N 13 mph21 km/h
Dew Point 58°F14°C
uv Index 6
Barometric Pressure 30.15 in1021 mb
POP 7% *
Humidity 53%
Sat, 19th
Grantham PA Weather - Saturday, Sep 19, 2026 - Overcast
Hi: 74°F 24°C
Lo: 54°F 12°C
Sunrise 06:52 AM
Sunset 07:10 PM
Wind ESE 6 mph10 km/h
Dew Point 48°F9°C
uv Index 5
Barometric Pressure 30.15 in1021 mb
POP 11% *
Humidity 46%
Sun, 20th
Grantham PA Weather - Sunday, Sep 20, 2026 - Light Rain Shower
Hi: 71°F 22°C
Lo: 61°F 16°C
Sunrise 06:53 AM
Sunset 07:08 PM
Wind SSW 6 mph9 km/h
Dew Point 64°F18°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 36% *
Humidity 84%
Mon, 21st
Grantham PA Weather - Monday, Sep 21, 2026 - Overcast
Hi: 73°F 23°C
Lo: 59°F 15°C
Sunrise 06:54 AM
Sunset 07:06 PM
Wind SSE 2 mph4 km/h
Dew Point 61°F16°C
uv Index 4
Barometric Pressure 30 in1016 mb
POP 23% *
Humidity 82%
Tue, 22nd
Grantham PA Weather - Tuesday, Sep 22, 2026 - Patchy Rain Nearby
Hi: 67°F 20°C
Lo: 60°F 16°C
Sunrise 06:55 AM
Sunset 07:05 PM
Wind E 5 mph9 km/h
Dew Point 61°F16°C
uv Index 4
Barometric Pressure 30.15 in1021 mb
POP 46% *
Humidity 94%
Wed, 23rd
Grantham PA Weather - Wednesday, Sep 23, 2026 - Fog
Hi: 66°F 19°C
Lo: 60°F 15°C
Sunrise 06:56 AM
Sunset 07:03 PM
Wind E 4 mph6 km/h
Dew Point 64°F18°C
uv Index 4
Barometric Pressure 30.21 in1023 mb
POP 54% *
Humidity 98%
Thu, 24th
Grantham PA Weather - Thursday, Sep 24, 2026 - Mist
Hi: 69°F 20°C
Lo: 58°F 15°C
Sunrise 06:57 AM
Sunset 07:01 PM
Wind E 9 mph14 km/h
Dew Point 62°F16°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 46% *
Humidity 97%
Fri, 25th
Grantham PA Weather - Friday, Sep 25, 2026 - Light Rain Shower
Hi: 72°F 22°C
Lo: 67°F 20°C
Sunrise 06:58 AM
Sunset 07:00 PM
Wind SSE 12 mph19 km/h
Dew Point 69°F20°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 50% *
Humidity 89%
Sat, 26th
Grantham PA Weather - Saturday, Sep 26, 2026 - Overcast
Hi: 74°F 23°C
Lo: 65°F 18°C
Sunrise 06:59 AM
Sunset 06:58 PM
Wind W 9 mph15 km/h
Dew Point 60°F16°C
uv Index 5
Barometric Pressure 29.77 in1008 mb
POP 19% *
Humidity 73%
Sun, 27th
Grantham PA Weather - Sunday, Sep 27, 2026 - Overcast
Hi: 65°F 18°C
Lo: 56°F 13°C
Sunrise 07:00 AM
Sunset 06:56 PM
Wind NNW 13 mph20 km/h
Dew Point 51°F11°C
uv Index 4
Barometric Pressure 29.97 in1015 mb
POP 17% *
Humidity 68%
Mon, 28th
Grantham PA Weather - Monday, Sep 28, 2026 - Sunny
Hi: 62°F 17°C
Lo: 49°F 10°C
Sunrise 07:01 AM
Sunset 06:55 PM
Wind NNW 16 mph25 km/h
Dew Point 38°F3°C
uv Index 5
Barometric Pressure 30 in1016 mb
POP 1% *
Humidity 45%
* POP = Probability of Precipitation. Data for 12:00 PM.