January weather forecast
Portsmouth, RI

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Weather in January

January brings with it the coldest spell of the year in Portsmouth, Rhode Island, with the mercury dipping to a chilly low of 26.4°F (-3.1°C). A major shift from the frosty conditions is not expected in February as cold weather will continue to hold a firm grip on the city. January is also one of the two months when snowfall occurs. Relative humidity remains fairly high, a consistent feature of Portsmouth clime during the year. From dawn till dusk, ample sunshine brings warmth to cast off the cold.

Temperature

Portsmouth experiences its lowest average temperatures in January, reaching a peak of 36.1°F (2.3°C) and a minimum of 26.4°F (-3.1°C).

Humidity

The average relative humidity in January is 75%.

Rainfall

In Portsmouth, in January, it is raining for 8.3 days, with typically 2.6" (66mm) of accumulated precipitation. In Portsmouth, during the entire year, the rain falls for 148.1 days and collects up to 29.65" (753mm) of precipitation.

Snowfall

January through March, May, November and December are months with snowfall in Portsmouth. In Portsmouth, during January, snow falls for 6.6 days and regularly aggregates up to 2.01" (51mm) of snow. In Portsmouth, Rhode Island, during the entire year, snow falls for 22.9 days and aggregates up to 8.78" (223mm) of snow.

Daylight

In Portsmouth, the average length of the day in January is 9h and 34min.
On the first day of January in Portsmouth, Rhode Island, sunrise is at 7:11 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:58 pm EST.

Sunshine

The average sunshine in January in Portsmouth is 5.2h.

UV index

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Portsmouth, Rhode Island. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: A maximum daily UV index of 2 during January morphs into the following directions:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
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Frequently asked questions

What are the coldest months in Portsmouth?

January is the month when Portsmouth sees the average lowest temperatures, with a high of 36.1°F (2.3°C) and a low of 26.4°F (-3.1°C).

How cold is January in Portsmouth?

The high-temperature, in January, in Portsmouth, is 36.1°F (2.3°C), while the low-temperature averages to 26.4°F (-3.1°C).

What is the average humidity in January in Portsmouth?

In Portsmouth, Rhode Island, the average relative humidity in January is 75%.

How much does it rain in Portsmouth in January?

In Portsmouth, during January, the rain falls for 8.3 days and regularly aggregates up to 2.6" (66mm) of precipitation.

How much does it snow in Portsmouth in January?

In January, in Portsmouth, it is snowing for 6.6 days. Throughout January, 2.01" (51mm) of snow is accumulated.

What is the average length of the day in January in Portsmouth?

In Portsmouth, Rhode Island, the average day length in January is 9h and 34min.

When is the sunrise / sunset in January in Portsmouth?

On the first day of January in Portsmouth, sunrise is at 7:11 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:58 pm EST.

How many hours of sunshine does Portsmouth have in January?

In January, the average sunshine duration in Portsmouth is 5.2h.

When is the lowest UV index in Portsmouth?

The months with the lowest UV index in Portsmouth, Rhode Island, are January through March and December, with an average maximum UV index of 2.

What is the UV index reading in January in Portsmouth?

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Portsmouth, RI

Average temperature in January - Portsmouth, RI
  • Average high temperature in January: 36.1°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in January: 26.4°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

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Average pressure in January
Portsmouth, RI

Average pressure in January - Portsmouth, RI
  • Average pressure in January: 30.01"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in January
Portsmouth, RI

Average wind speed in January - Portsmouth, RI
  • Average wind speed in January: 12.1mph

The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).

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Average humidity in January
Portsmouth, RI

Average humidity in January - Portsmouth, RI
  • Average humidity in January: 75%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).

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Average rainfall in January
Portsmouth, RI

Average rainfall in January - Portsmouth, RI
  • Average rainfall in January: 2.6"

The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is September (1.42").

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Average rainfall days in January
Portsmouth, RI

Average rainfall days in January - Portsmouth, RI
  • Average rainfall days in January: 8.3 days

The month with the highest number of rainy days is April (15.6 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in January
Portsmouth, RI

Average snowfall in January - Portsmouth, RI
  • Average snowfall in January: 2.01"

The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, June, July, August, September and October (0").

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Average snowfall days in January
Portsmouth, RI

Average snowfall days in January - Portsmouth, RI
  • Average snowfall days in January: 6.6 days

The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Portsmouth, RI

Average daylight in January / Average sunshine in January - Portsmouth, RI
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 5h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in January
Portsmouth, RI

Average sunshine days in January - Portsmouth, RI
  • Average sunshine days in January: 15.6 days

The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is April (12.3 days).

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Average UV index in January
Portsmouth, RI

Average UV index in January - Portsmouth, RI
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).

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Average cloud cover in January
Portsmouth, RI

Average cloud cover in January - Portsmouth, RI
  • Average cloud cover in January: 45

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in January
Portsmouth, RI

Average visibility in January - Portsmouth, RI
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Portsmouth, Rhode Island, USA

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