August weather forecast
Grantham, NH

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Weather in August

August, the last month of the summer in Grantham, is also a moderately hot month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 55.6°F (13.1°C).

Temperature

Welcoming August, Grantham notes an average high-temperature of a still warm 76.6°F (24.8°C), nearly consistent with July's 78.8°F (26°C). Throughout August, Grantham records an average temperature of 55.6°F (13.1°C) at night.

Humidity

In Grantham, the average relative humidity in August is 78%.

Rainfall

In Grantham, in August, during 15.3 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Grantham, during the entire year, the rain falls for 153.2 days and collects up to 29.92" (760mm) of precipitation.

Snowfall

In Grantham, New Hampshire, snow does not fall in June through September.

Daylight

In Grantham, the average length of the day in August is 13h and 55min.
On the first day of the month, sunrise is at 5:38 am and sunset at 8:10 pm. On the last day of August, sunrise is at 6:12 am and sunset at 7:25 pm EDT.

Sunshine

August has the most sunshine of the year, with an average of 10.1h of sunshine.

UV index

May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 5 during August translates into the following directions:
Take precautions - Protection against skin and eye damage is obliged. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the usual temperature for Grantham in August?

In August, the average high-temperature and low-temperature are 76.6°F (24.8°C) and 55.6°F (13.1°C) respectively.

What is the average humidity in August in Grantham?

The average relative humidity in August is 78%.

How many days does it rain in August in Grantham?

In Grantham, during August, the rain falls for 15.3 days and regularly aggregates up to 2.09" (53mm) of precipitation.

When it does not snow in Grantham?

June through September are months without snowfall in Grantham, New Hampshire.

How many hours of daylight does Grantham have in August?

In August, the average day length is 13h and 55min.

When are sunrise and sunset in August in Grantham?

On the first day of August in Grantham, New Hampshire, sunrise is at 5:38 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 7:25 pm EDT.

What month has the most sunshine in Grantham?

August has the most sunshine of the year in Grantham, New Hampshire, with an average of 10.1h of sunshine.

How long on average sun shines in August in Grantham?

The average sunshine duration in August is 10.1h.

What is the month with the highest UV index in Grantham?

May through August, with an average maximum UV index of 5, are months with the highest UV index in Grantham, New Hampshire.

How high is the UV index in August in Grantham?

In Grantham, the average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Grantham, NH

Average temperature in August - Grantham, NH
  • Average high temperature in August: 76.6°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (25.9°F).

  • Average low temperature in August: 55.6°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

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Average pressure in August
Grantham, NH

Average pressure in August - Grantham, NH
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in August
Grantham, NH

Average wind speed in August - Grantham, NH
  • Average wind speed in August: 5mph

The windiest months (with the highest average wind speed) are January, February, March and April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in August
Grantham, NH

Average humidity in August - Grantham, NH
  • Average humidity in August: 78%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in August
Grantham, NH

Average rainfall in August - Grantham, NH
  • Average rainfall in August: 2.09"

The wettest month (with the highest rainfall) is October (3.39").
The driest month (with the least rainfall) is September (2.05").

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Average rainfall days in August
Grantham, NH

Average rainfall days in August - Grantham, NH
  • Average rainfall days in August: 15.3 days

The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (7.9 days).

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Average snowfall in August
Grantham, NH

Average snowfall in August - Grantham, NH
  • Average snowfall in August: 0"

The month with the highest snowfall is February (11.18").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Grantham, NH

Average snowfall days in August - Grantham, NH
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Grantham, NH

Average daylight in August / Average sunshine in August - Grantham, NH
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in August: 10h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).

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Average sunshine days in August
Grantham, NH

Average sunshine days in August - Grantham, NH
  • Average sunshine days in August: 13.7 days

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is February (11.3 days).

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Average UV index in August
Grantham, NH

Average UV index in August - Grantham, NH
  • Average UV index in August: 5

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in August
Grantham, NH

Average cloud cover in August - Grantham, NH
  • Average cloud cover in August: 36

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 36).

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Average visibility in August
Grantham, NH

Average visibility in August - Grantham, NH
  • Average visibility in August: 5mi

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).

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Grantham, New Hampshire, USA

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