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

Monthly weather forecast and climate
Portsmouth, United Kingdom

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

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

April is a moderate spring month in Portsmouth, United Kingdom, with average temperature fluctuating between 6.1°C (43°F) and 13.2°C (55.8°F). In April, the average high-temperature is practically the same as in March - a moderate 13.2°C (55.8°F). Weather in April »

The last month of the spring, May, is an enjoyable month in Portsmouth, United Kingdom, with temperature in the range of an average low of 9.2°C (48.6°F) and an average high of 16.7°C (62.1°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 still a comfortable month in Portsmouth, United Kingdom, with average temperature varying between 12.1°C (53.8°F) and 19.2°C (66.6°F). In June, the average high-temperature is practically the same as in May - a still enjoyable 19.2°C (66.6°F). Weather in June »

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

The last month of the summer, August, is another pleasant month in Portsmouth, United Kingdom, with average temperature fluctuating between 21.4°C (70.5°F) and 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 »

September, the first month of the autumn, in Portsmouth, is still a comfortable month, with average temperature varying between 12.2°C (54°F) and 19°C (66.2°F). In Portsmouth, the average high-temperature is relatively the same as in August - a comfortable 19°C (66.2°F). Weather in September »

October, like September, is another mild autumn month in Portsmouth, United Kingdom, with temperature in the range of an average high of 15.5°C (59.9°F) and an average low of 9.6°C (49.3°F). In Portsmouth, the average high-temperature in October marginally drops, from an enjoyable 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 average temperature ranging between min 6.2°C (43.2°F) and max 11.5°C (52.7°F). In Portsmouth, the average high-temperature marginally drops, from a moderate 15.5°C (59.9°F) in October, to a cool 11.5°C (52.7°F). Weather in November »

The first month of the winter, December, is still a chilly month in Portsmouth, United Kingdom, with temperature in the range of an average low of 3.8°C (38.8°F) and an average high of 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?

January and February, with an average high-temperature of 8.2°C (46.8°F), are the coldest months.

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 are the months with the lowest UV index in Portsmouth?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

What month is the sea coldest in Portsmouth?

The month with the coldest seawater in Portsmouth is March, with an average sea temperature of 8.6°C (47.5°F).

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 in Portsmouth, United Kingdom. Rain falls for 7.4 days and accumulates 42mm (1.7") of precipitation.

When are the longest days in Portsmouth?

The month with the longest days is June, with an average of 16.4h of daylight.

What are the warmest months 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?

The month with the most sunshine in Portsmouth, United Kingdom, is July, with an average of 8.4h of sunshine.

What is the month with the warmest sea water in Portsmouth?

September is the month with the warmest seawater, with an average sea temperature of 17.3°C (63.1°F).

What is the wettest month in Portsmouth?

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

What is the month with the shortest days in Portsmouth?

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

What is the month with the least sunshine in Portsmouth?

December has the least sunshine of the year in Portsmouth, United Kingdom, 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