What’s the climate like in Portsmouth?
The current climate of Portsmouth features average monthly temperatures ranging from highs of 28°C during the day to lows of 3°C. The average yearly temperature is around 15°C. At night, temperatures in the colder months average around -7°C and in the warmer months around 18°C.
The highest temperature recorded in Portsmouth in recent years was 36°C in June 2021. The lowest daytime temperature recorded was -15°C in December 2017.
On average, Portsmouth gets 1388 mm of precipitation each year. Of this, about 97 cm is snowfall. For comparison, London gets 701 mm of precipitation each year.
Best time to visit Portsmouth?
The best time to visit Portsmouth for pleasant to warm weather is May through August and October. There might be some rain during this period, but the temperatures are just right for exploring Portsmouth.
Climate Table of Portsmouth
The climate table of Portsmouth shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 3 | 3 | 7 | 13 | 20 | 24 | 28 | 27 | 23 | 17 | 10 | 5 |
| Temp. min (°C) | -5 | -6 | -2 | 4 | 9 | 14 | 18 | 17 | 14 | 8 | 1 | -2 |
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| Precipitation (mm) | 108 | 67 | 75 | 94 | 62 | 147 | 143 | 83 | 163 | 115 | 146 | 185 |
| Snow (cm) | 26 | 28 | 14 | 0,9 | 0 | 0 | 0 | 0 | 0 | 0,1 | 3,2 | 25 |
| UV Index | 3 | 4 | 6 | 6 | 7 | 6 | 7 | 7 | 6 | 4 | 3 | 2 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 15°C
- Highest temperature: 28°C in July
- Lowest temperature: 3°C in January and February
- Precipitation*: 1388 mm per year, averaging 116 mm per month
- Snowfall: 97 cm per year
- Driest months: 62 mm in May, 67 mm in February and 75 mm in March
- Wettest months: 185 mm in December, 163 mm in September and 147 mm in June
*Precipitation is measured as a combination of rain, snow, and hail
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Table of Contents
Average Temperature per Month in Portsmouth
This graph shows the average maximum temperatures per month in Portsmouth, New Hampshire. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Portsmouth
This graph shows how much precipitation Portsmouth, New Hampshire, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Portsmouth
This graph shows how much snow Portsmouth, New Hampshire, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Portsmouth
This graph shows the average UV index per month in Portsmouth, New Hampshire. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Portsmouth
This graph shows the average yearly temperature in Portsmouth, New Hampshire. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Portsmouth
This chart shows the total yearly precipitation in Portsmouth, New Hampshire, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Portsmouth
This chart shows the total yearly snowfall in Portsmouth, New Hampshire, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Portsmouth
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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.
