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As of 17:20 EDT

Weather in Grantham, PA

85°Current weather

Grantham, Saturday, 8 August, 17:20

Overcast. Feels like 93°. High 85°, low 70°.

Pressure29.97 inHg
Wind7 mph SW
Humidity70%
Visibility6.2 mi
Dew point73°
Sun, 0986° / 70°0Clear
86 °Clear

Grantham, Sunday, 9 August

Clear. High 86°, low 70°.

Pressure30.00 inHg
Wind8.7 mph NW
Humidity46%
Visibility6.2 mi
Dew point63°
Mon, 1091° / 68°0.25Rain
91 °Rain

Grantham, Monday, 10 August

Rain. High 91°, low 68°.

Pressure30.03 inHg
Wind9.2 mph NW
Humidity63%
Visibility6.2 mi
Dew point67°
Tue, 1189° / 67°0.3Rain
89 °Rain

Grantham, Tuesday, 11 August

Rain. High 89°, low 67°.

Pressure29.94 inHg
Wind6 mph W
Humidity60%
Visibility6.2 mi
Dew point66°
Wed, 1279° / 67°0.17Light rain
79 °Light rain

Grantham, Wednesday, 12 August

Light rain. High 79°, low 67°.

Pressure29.83 inHg
Wind4.2 mph NW
Humidity84%
Visibility6.2 mi
Dew point68°
Thu, 1387° / 67°0Partly cloudy
87 °Partly cloudy

Grantham, Thursday, 13 August

Partly cloudy. High 87°, low 67°.

Pressure29.77 inHg
Wind13.4 mph NW
Humidity41%
Visibility—
Dew point58°
Fri, 1478° / 60°0.02Light rain
78 °Light rain

Grantham, Friday, 14 August

Light rain. High 78°, low 60°.

Pressure29.97 inHg
Wind9.7 mph N
Humidity38%
Visibility—
Dew point47°
Sat, 1577° / 54°0Clear
77 °Clear

Grantham, Saturday, 15 August

Clear. High 77°, low 54°.

Pressure30.21 inHg
Wind11.2 mph NE
Humidity36%
Visibility—
Dew point44°
Sun, 1678° / 54°0Clear
78 °Clear

Grantham, Sunday, 16 August

Clear. High 78°, low 54°.

Pressure30.30 inHg
Wind6.8 mph N
Humidity34%
Visibility—
Dew point45°
Mon, 1786° / 58°0Overcast
86 °Overcast

Grantham, Monday, 17 August

Overcast. High 86°, low 58°.

Pressure30.12 inHg
Wind9.3 mph S
Humidity46%
Visibility—
Dew point57°
Tue, 1876° / 65°0.13Light rain
76 °Light rain

Grantham, Tuesday, 18 August

Light rain. High 76°, low 65°.

Pressure29.97 inHg
Wind5 mph SW
Humidity88%
Visibility—
Dew point66°
Wed, 1982° / 65°0Partly cloudy
82 °Partly cloudy

Grantham, Wednesday, 19 August

Partly cloudy. High 82°, low 65°.

Pressure29.91 inHg
Wind12.3 mph N
Humidity40%
Visibility—
Dew point54°
Thu, 2068° / 59°0Light rain
68 °Light rain

Grantham, Thursday, 20 August

Light rain. High 68°, low 59°.

Pressure30.00 inHg
Wind4.2 mph NW
Humidity64%
Visibility—
Dew point53°
Fri, 2168° / 60°0.43Rain
68 °Rain

Grantham, Friday, 21 August

Rain. High 68°, low 60°.

Pressure29.85 inHg
Wind3.4 mph E
Humidity97%
Visibility—
Dew point67°
Sat, 2284° / 66°0Clear
84 °Clear

Grantham, Saturday, 22 August

Clear. High 84°, low 66°.

Pressure29.77 inHg
Wind10.7 mph NW
Humidity42%
Visibility—
Dew point56°
Sun, 2374° / 56°0Clear
74 °Clear

Grantham, Sunday, 23 August

Clear. High 74°, low 56°.

Pressure30.03 inHg
Wind14.1 mph N
Humidity31%
Visibility—
Dew point38°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Grantham, PA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Grantham, PA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.