Portsmouth
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Portsmouth, United Kingdom

January, the same as December, in Portsmouth, United Kingdom, is another chilly winter month, with average temperature varying between 8.2°C (46.8°F) and 3.4°C (38.1°F). January and February, with an average high-temperature of 8.2°C (46.8°F), are the coldest months. Weather in January »
February, the last month of the winter, in Portsmouth, is also a frosty month, with average temperature fluctuating between 2.8°C (37°F) and 8.2°C (46.8°F). The coldest months are January and February, with an average high-temperature of 8.2°C (46.8°F). Weather in February »

The first month of the spring, March, is a fresh month in Portsmouth, United Kingdom, with average temperature ranging between min 4.5°C (40.1°F) and max 10.5°C (50.9°F). In Portsmouth, the average high-temperature is practically the same as in February - a fresh 10.5°C (50.9°F). Weather in March »

April in Portsmouth, United Kingdom, is a moderate spring month, with temperature in the range of an average high of 13.2°C (55.8°F) and an average low of 6.1°C (43°F). In Portsmouth, the average high-temperature is relatively the same as in March - a mild 13.2°C (55.8°F). Weather in April »

May, the last month of the spring, in Portsmouth, is an enjoyable month, with average temperature fluctuating between 16.7°C (62.1°F) and 9.2°C (48.6°F). In May, the average high-temperature slightly increases, from a moderate 13.2°C (55.8°F) in April, to a comfortable 16.7°C (62.1°F). Weather in May »

The first month of the summer, June, is also an enjoyable month in Portsmouth, United Kingdom, with temperature in the range of an average high of 19.2°C (66.6°F) and an average low of 12.1°C (53.8°F). In June, the average high-temperature is almost the same as in May - a still enjoyable 19.2°C (66.6°F). Weather in June »

July in Portsmouth, United Kingdom, is an agreeable summer month, with average temperature varying between 14.2°C (57.6°F) and 21.4°C (70.5°F). The warmest months are July and August, with an average high-temperature of 21.4°C (70.5°F). Weather in July »

The last month of the summer, August, is another pleasant month in Portsmouth, United Kingdom, with temperature in the range of an average high of 21.4°C (70.5°F) and an average low of 14.3°C (57.7°F). July and August, with an average high-temperature of 21.4°C (70.5°F), are the warmest months. Weather in August »

The first month of the autumn, September, is also an enjoyable month in Portsmouth, United Kingdom, with average temperature varying between 12.2°C (54°F) and 19°C (66.2°F). In September, the average high-temperature is practically the same as in August - an enjoyable 19°C (66.2°F). Weather in September »

October, like September, is a moderate autumn month in Portsmouth, United Kingdom, with average temperature fluctuating between 15.5°C (59.9°F) and 9.6°C (49.3°F). In Portsmouth, the average high-temperature in October slightly decreases, from a comfortable 19°C (66.2°F) in September, to a moderate 15.5°C (59.9°F). Weather in October »

The last month of the autumn, November, is another cool month in Portsmouth, United Kingdom, with temperature in the range of an average low of 6.2°C (43.2°F) and an average high of 11.5°C (52.7°F). In November, the average high-temperature slightly decreases, from a moderate 15.5°C (59.9°F) in October, to a fresh 11.5°C (52.7°F). Weather in November »

The first month of the winter, December, is also a frosty month in Portsmouth, United Kingdom, with average temperature varying between 3.8°C (38.8°F) and 8.7°C (47.7°F). In Portsmouth, the average high-temperature in December is almost the same as in November - a chilly 8.7°C (47.7°F). Weather in December »

What are the coldest months in Portsmouth?

The coldest months in Portsmouth, United Kingdom, are January and February, with an average high-temperature of 8.2°C (46.8°F).

How much does it rain in Portsmouth?

Throughout the year, in Portsmouth, United Kingdom, there are 103.4 rainfall days, and 699mm (27.5") of precipitation is accumulated.

What is the month with the lowest UV index in Portsmouth?

Months with the lowest UV index in Portsmouth, United Kingdom, are January, February, November and December, with an average maximum UV index of 1.

What month is the sea coldest in Portsmouth?

With an average sea temperature of 8.6°C (47.5°F), March is the month with the coldest seawater in Portsmouth. Swimming in 8.6°C (47.5°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What are the months with the highest UV index in Portsmouth?

Months with the highest UV index are May through August, with an average maximum UV index of 6.

What is the driest month in Portsmouth?

June is the month with the least rainfall. Rain falls for 7.4 days and accumulates 42mm (1.7") of precipitation.

When are the longest days in Portsmouth?

With an average of 16.4h of daylight, June has the longest days of the year in Portsmouth.

What is the warmest month in Portsmouth?

Warmest months in Portsmouth are July and August, with an average high-temperature of 21.4°C (70.5°F).

What month has the most sunshine in Portsmouth?

July has the most sunshine of the year in Portsmouth, United Kingdom, with an average of 8.4h of sunshine.

What month is the sea warmest in Portsmouth?

September is the month with the warmest seawater, with an average sea temperature of 17.3°C (63.1°F). For swimming, a surface water temperature of 17.3°C (63.1°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the wettest month in Portsmouth?

October is the month with the most rainfall. Rain falls for 10.9 days and accumulates 86.2mm (3.4") of precipitation.

What is the month with the shortest days in Portsmouth?

With an average of 8h of daylight, December has the shortest days of the year in Portsmouth.

What is the month with the least sunshine in Portsmouth?

The month with the least sunshine in Portsmouth, United Kingdom, is December, with an average of 2h of sunshine.
Average temperature - Portsmouth, United Kingdom
Average rainfall - Portsmouth, United Kingdom

The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the lowest rainfall) is June (42mm).

Average rainfall days - Portsmouth, United Kingdom

Months with the highest number of rainy days are January and December (11.2 days).
The month with the lowest number of rainy days is July (5.4 days).

Average sea temperature - Portsmouth, United Kingdom

The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).

Average daylight / Average sunshine - Portsmouth, United Kingdom
Average UV index - Portsmouth, United Kingdom