January weather forecast
Portsmouth, VA

Gold and brown trees and modern developed buildings in Downtown Portsmouth, Virginia
Gold and brown trees and modern developed buildings in Downtown Portsmouth, Virginia

Weather in January

January, like December, is a frosty winter month in Portsmouth, Virginia, with temperature in the range of an average low of 34.7°F (1.5°C) and an average high of 45.9°F (7.7°C).

Temperature

With an average high-temperature of 45.9°F (7.7°C) and an average low-temperature of 34.7°F (1.5°C), January is the coldest month.

Humidity

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

Rainfall

In Portsmouth, during January, the rain falls for 8.4 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Portsmouth, Virginia, during the entire year, the rain falls for 151.9 days and collects up to 20.35" (517mm) of precipitation.

Snowfall

Months with snowfall in Portsmouth are January through March, November and December. The month with the most snowfall is January, when snow falls for 2.2 days and typically aggregates up to 0.47" (12mm) of snow.

Ocean temperature

In Portsmouth, in January, the average water temperature is 45.5°F (7.5°C).
Note: Swimming in 45.5°F (7.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In January, the average length of the day in Portsmouth is 9h and 59min.
On the first day of January in Portsmouth, sunrise is at 7:17 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:29 pm EST.

Sunshine

In January, the average sunshine in Portsmouth is 5.5h.

UV index

January is the month with the lowest UV index in Portsmouth, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the coldest month in Portsmouth?

With an average high-temperature of 45.9°F (7.7°C) and an average low-temperature of 34.7°F (1.5°C), January is the coldest month in Portsmouth, Virginia.

What is the temperature in January in Portsmouth?

The average high-temperature, in January, is 45.9°F (7.7°C), while the average low-temperature is 34.7°F (1.5°C).

What is the average humidity in January in Portsmouth?

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

How much does it rain in Portsmouth in January?

In January, the rain falls for 8.4 days. Throughout January, 1.3" (33mm) of precipitation is accumulated.

When does it snow the most in Portsmouth?

The month with the most snowfall in Portsmouth is January, when snow falls for 2.2 days and typically aggregates up to 0.47" (12mm) of snow.

How much does it snow in Portsmouth in January?

In Portsmouth, Virginia, in January, snow falls for 2.2 days, with typically accumulated 0.47" (12mm) of snow.

What is the ocean temperature in January in Portsmouth?

In Portsmouth, in January, the average water temperature is 45.5°F (7.5°C). Swimming in 45.5°F (7.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In January, the average day length is 9h and 59min.

When is the sunrise / sunset in January in Portsmouth?

On the first day of January in Portsmouth, sunrise is at 7:17 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:29 pm EST.

How long on average sun shines in January in Portsmouth?

The average sunshine duration in January in Portsmouth, Virginia, is 5.5h.

When is the lowest UV index in Portsmouth?

With an average maximum UV index of 2, January is the month with the lowest UV index in Portsmouth, Virginia.

What is the UV index intensity in January in Portsmouth?

In January, the average daily maximum UV index in Portsmouth is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Portsmouth, VA

Average temperature in January - Portsmouth, VA
  • Average high temperature in January: 45.9°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (45.9°F).

  • Average low temperature in January: 34.7°F

The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).

[Resources]

Average pressure in January
Portsmouth, VA

Average pressure in January - Portsmouth, VA
  • Average pressure in January: 30.11"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

[Resources]

Average wind speed in January
Portsmouth, VA

Average wind speed in January - Portsmouth, VA
  • Average wind speed in January: 10.1mph

The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).

[Resources]

Average humidity in January
Portsmouth, VA

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

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and November (74%).

[Resources]

Average rainfall in January
Portsmouth, VA

Average rainfall in January - Portsmouth, VA
  • Average rainfall in January: 1.3"

The wettest month (with the highest rainfall) is August (2.52").
The driest month (with the least rainfall) is November (1.1").

[Resources]

Average rainfall days in January
Portsmouth, VA

Average rainfall days in January - Portsmouth, VA
  • Average rainfall days in January: 8.4 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.3 days).

[Resources]

Average snowfall in January
Portsmouth, VA

Average snowfall in January - Portsmouth, VA
  • Average snowfall in January: 0.47"

The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").

[Resources]

Average snowfall days in January
Portsmouth, VA

Average snowfall days in January - Portsmouth, VA
  • Average snowfall days in January: 2.2 days

The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

[Resources]

Average sea temperature in January
Portsmouth, VA

Average sea temperature in January - Portsmouth, VA
  • Average sea temperature in January: 45.5°F

The best month for swimming (with the highest average sea temperature) is August (80°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).

[Resources]

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

Average daylight in January / Average sunshine in January - Portsmouth, VA
  • Average daylight in January: 9h and 59min

The month with the longest days is June (Average daylight: 14h and 39min).
The month with the shortest days is December (Average daylight: 9h and 41min).

  • Average sunshine in January: 5h and 30min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).

[Resources]

Average sunshine days in January
Portsmouth, VA

Average sunshine days in January - Portsmouth, VA
  • Average sunshine days in January: 19 days

The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is August (10.8 days).

[Resources]

Average UV index in January
Portsmouth, VA

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

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).

[Resources]

Average cloud cover in January
Portsmouth, VA

Average cloud cover in January - Portsmouth, VA
  • Average cloud cover in January: 39

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).

[Resources]

Average visibility in January
Portsmouth, VA

Average visibility in January - Portsmouth, VA
  • 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location