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Average weather for Portsmouth in January

It's warm in January in Portsmouth with an average temperature of 29°C. Temperatures this month range from a low of 28°C to a high of 29°C. At night, you can expect temperatures between 21°C and 22°C.

Daily Temperature in January in Portsmouth

Start of January

The month of January starts in Portsmouth with hot temps, averaging around 29°C during the day and nights around 22°C. There are plenty of days with a good chance of precipitation.

Mid January

By mid-January, daytime temps stay steady at around 29°C, with nights around 22°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.

End of January

By the end of January, the average daytime temperature in Portsmouth is around 29°C, while nighttime temps are about 22°C. A shower might pop up, but overall, the weather will be dry and sunny.

In January, there is an average of 143 mm of precipitation, spread over 20 days. The wind speed is around 4 Bft, mostly coming from the East.

Portsmouth in January

New York
Temperature Average temperature
29°C 5°C
Sun Max. temperature
29°C 11°C
Sun Min. temperature
28°C -5°C
Rain Total precipitation
143 mm 97 mm
Rain Rainy days
20 days 12 days

UV index

The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

Is January a good time to visit Portsmouth?

Looking for sun? January isn’t a good month to be in Portsmouth. The temperature is nice, but there’s too much chance of rain.

Temperature records

With 30°C in 2018, Portsmouth reached the highest temperature in January over the past 10 years. The lowest daytime temperature in this month was 25°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of 16°C to a highest value of 24°C.

Check out the climate of Portsmouth for all months and discover the best travel time

Daily Temperature in January in Portsmouth

This chart shows the average daily high and low temperatures in January for Portsmouth, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.

Daily Temperature in January in Portsmouth

Daily Precipitation in January in Portsmouth

The chart below shows the average daily precipitation in January for Portsmouth, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.

A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for January, you can expect about 20 days of precipitation in Portsmouth.

Daily Precipitation in January in Portsmouth

Daily UV index in January in Portsmouth

This chart shows the average daily UV index in January in Portsmouth, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

Daily UV Index in January in Portsmouth

Temperature in January in Portsmouth over the years

This chart shows the average temperature in January in Portsmouth, measured in degrees Celsius, over the past few years.

Temperature in January in Portsmouth Over the Years

Total precipitation in January in Portsmouth over the years

This chart shows the average precipitation in January in Portsmouth, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.

Precipitation in January in Portsmouth over the years

Daily weather in January for Portsmouth

Click on any day in January to get detailed info about the usual weather on that day in Portsmouth. Check out the historical temperatures and precipitation over the past 10 years on this day.

Weather experiences in January in Portsmouth

Have you been to Portsmouth in January?

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Average weather in Portsmouth by month

Click on a month below to see detailed weather info for Portsmouth. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.


Or check out the climate of Portsmouth for all months at once

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