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As of 16:42 EDT

Weather in Grantham, NH

82°Current weather

Grantham, Saturday, 8 August, 16:42

Partly cloudy. Feels like 85°. High 82°, low 68°.

Pressure29.85 inHg
Wind2 mph SW
Humidity64%
Visibility6.2 mi
Dew point68°
Sun, 0985° / 66°0Clear
85 °Clear

Grantham, Sunday, 9 August

Clear. High 85°, low 66°.

Pressure29.91 inHg
Wind11.9 mph W
Humidity39%
Visibility6.2 mi
Dew point55°
Mon, 1086° / 62°0.02Light rain
86 °Light rain

Grantham, Monday, 10 August

Light rain. High 86°, low 62°.

Pressure29.94 inHg
Wind8.6 mph SW
Humidity37%
Visibility6.2 mi
Dew point54°
Tue, 1181° / 62°0.01Light rain
81 °Light rain

Grantham, Tuesday, 11 August

Light rain. High 81°, low 62°.

Pressure29.83 inHg
Wind12.3 mph NW
Humidity45%
Visibility6.2 mi
Dew point55°
Wed, 1276° / 58°0.19Light rain
76 °Light rain

Grantham, Wednesday, 12 August

Light rain. High 76°, low 58°.

Pressure29.77 inHg
Wind5.7 mph S
Humidity63%
Visibility6.2 mi
Dew point60°
Thu, 1371° / 53°0.11Light rain
71 °Light rain

Grantham, Thursday, 13 August

Light rain. High 71°, low 53°.

Pressure29.71 inHg
Wind9.7 mph NW
Humidity89%
Visibility—
Dew point63°
Fri, 1467° / 46°0.01Light rain
67 °Light rain

Grantham, Friday, 14 August

Light rain. High 67°, low 46°.

Pressure29.88 inHg
Wind10 mph NW
Humidity53%
Visibility—
Dew point44°
Sat, 1570° / 47°0Clear
70 °Clear

Grantham, Saturday, 15 August

Clear. High 70°, low 47°.

Pressure30.12 inHg
Wind12.4 mph NW
Humidity44%
Visibility—
Dew point41°
Sun, 1675° / 47°0Overcast
75 °Overcast

Grantham, Sunday, 16 August

Overcast. High 75°, low 47°.

Pressure30.27 inHg
Wind6.6 mph NW
Humidity42%
Visibility—
Dew point42°
Mon, 1769° / 52°0Overcast
69 °Overcast

Grantham, Monday, 17 August

Overcast. High 69°, low 52°.

Pressure30.18 inHg
Wind5.4 mph SW
Humidity50%
Visibility—
Dew point48°
Tue, 1874° / 59°0.2Light rain
74 °Light rain

Grantham, Tuesday, 18 August

Light rain. High 74°, low 59°.

Pressure30.00 inHg
Wind6.1 mph S
Humidity98%
Visibility—
Dew point61°
Wed, 1976° / 55°0.01Light rain
76 °Light rain

Grantham, Wednesday, 19 August

Light rain. High 76°, low 55°.

Pressure29.88 inHg
Wind7.9 mph NW
Humidity61%
Visibility—
Dew point55°
Thu, 2078° / 51°0.03Light rain
78 °Light rain

Grantham, Thursday, 20 August

Light rain. High 78°, low 51°.

Pressure30.00 inHg
Wind3.8 mph W
Humidity57%
Visibility—
Dew point54°
Fri, 2177° / 55°0.07Light rain
77 °Light rain

Grantham, Friday, 21 August

Light rain. High 77°, low 55°.

Pressure29.97 inHg
Wind9.6 mph S
Humidity75%
Visibility—
Dew point58°
Sat, 2277° / 56°0.04Light rain
77 °Light rain

Grantham, Saturday, 22 August

Light rain. High 77°, low 56°.

Pressure29.77 inHg
Wind7 mph NW
Humidity80%
Visibility—
Dew point61°
Sun, 2365° / 52°0.03Light rain
65 °Light rain

Grantham, Sunday, 23 August

Light rain. High 65°, low 52°.

Pressure29.80 inHg
Wind15.8 mph NW
Humidity56%
Visibility—
Dew point42°

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, NH 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, NH 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.