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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
Climate and monthly weather forecast
Weather in January
January, the same as December, in Portsmouth, United Kingdom, is a frosty winter month, with an average temperature varying between 8.2°C (46.8°F) and 3.4°C (38.1°F). During January and February, Portsmouth experiences its lowest temperatures, averaging a high-temperature of 8.2°C (46.8°F). Weather in January »
Weather in February
February, the last month of the winter in Portsmouth, is also a frosty month, with an average temperature fluctuating between 2.8°C (37°F) and 8.2°C (46.8°F). Portsmouth's coldest months, January and February, record an average high-temperature of 8.2°C (46.8°F). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Portsmouth, United Kingdom, with an average temperature varying between 4.5°C (40.1°F) and 10.5°C (50.9°F). The commencement of March brings an average high-temperature of a cool 10.5°C (50.9°F), marking an inconsequential divergence from February. Weather in March »
Weather in April
April in Portsmouth, United Kingdom, is a moderate spring month, with an average temperature varying between 6.1°C (43°F) and 13.2°C (55.8°F). At the start of April, Portsmouth's average high-temperature reaches a refreshing 13.2°C (55.8°F), subtly different from the preceding month. Weather in April »
Weather in May
The last month of the spring, May, is a comfortable 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). May's arrival coincides with a subtle temperature rise, moving from April's refreshing 13.2°C (55.8°F) to a comfortable 16.7°C (62.1°F). Weather in May »
Weather in June
The first month of the summer, June, is still a refreshing month in Portsmouth, United Kingdom, with an average temperature fluctuating between 12.1°C (53.8°F) and 19.2°C (66.6°F). June ushers in an average high-temperature of a still refreshing 19.2°C (66.6°F), aligning closely with the preceding month. Weather in June »
Weather in July
July is an agreeable summer 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 14.2°C (57.6°F). July and August bring Portsmouth's highest average temperatures, reaching a high of 21.4°C (70.5°F). Weather in July »
Weather in August
August, the last month of the summer in Portsmouth, is another pleasant month, with temperature in the range of an average low of 14.3°C (57.7°F) and an average high of 21.4°C (70.5°F). The highest point of temperatures falls in July and August, when the average high-temperature ascends to 21.4°C (70.5°F). Weather in August »
Weather in September
The first month of the autumn, September, is also an enjoyable month in Portsmouth, United Kingdom, with temperature in the range of an average high of 19°C (66.2°F) and an average low of 12.2°C (54°F). Entering September, Portsmouth's average high-temperature reads an enjoyable 19°C (66.2°F), indicating a close resemblance to the previous month's climate. Weather in September »
Weather in October
October, like September, is a moderate autumn month in Portsmouth, United Kingdom, with temperature in the range of an average low of 9.6°C (49.3°F) and an average high of 15.5°C (59.9°F). A subtle shift in Portsmouth's weather is observed as September turns into October, with the average high temperature reducing from an enjoyable 19°C (66.2°F) to a moderate 15.5°C (59.9°F). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh 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). November's onset introduces a mild reduction in the average high-temperature, from a moderate 15.5°C (59.9°F) in October to a fresh 11.5°C (52.7°F). Weather in November »
Weather in December
December, the first month of the winter in Portsmouth, is still a chilly month, with an average temperature fluctuating between 8.7°C (47.7°F) and 3.8°C (38.8°F). Portsmouth, United Kingdom, registers an average high-temperature of a chilly 8.7°C (47.7°F) at the commencement of December, closely related to the preceding month. Weather in December »
Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Portsmouth?
Lowest temperatures are observed in January and February, averaging a high-temperature of 8.2°C (46.8°F).
How many days does it rain in Portsmouth?
Throughout the year, in Portsmouth, United Kingdom, there are 103.4 rainfall days, and 699mm (27.52") 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 in Portsmouth, United Kingdom.
What month is the sea coldest in Portsmouth?
March is the month with the coldest seawater in Portsmouth, United Kingdom, with an average sea temperature of 8.6°C (47.5°F).
What are the months with the highest UV index in Portsmouth?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the driest month in Portsmouth?
The month with the least rainfall in Portsmouth is June, when the rain falls for 7.4 days and typically collects 42mm (1.65") of precipitation.
When are the longest days in Portsmouth?
The month with the longest days in Portsmouth, United Kingdom, is June, with an average of 16h and 24min of daylight.
What is the hottest time of year in Portsmouth?
The height of temperatures is seen during July and August, averaging a 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?
The month with the warmest seawater is September, 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, United Kingdom. Rain falls for 10.9 days and accumulates 86mm (3.39") of precipitation.
When is Daylight Saving Time (DST) in Portsmouth?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
What is the month with the shortest days in Portsmouth?
The month with the shortest days in Portsmouth, United Kingdom, is December, with an average of 8h and 0min of daylight.
What is the month with the least sunshine in Portsmouth?
The month with the least sunshine is December, with an average of 2h of sunshine.
Average temperature
Portsmouth, United Kingdom
The warmest months (with the highest average high temperature) are July and August (21.4°C).
The months with the lowest average high temperature are January and February (8.2°C).
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).
Average rainfall
Portsmouth, United Kingdom
- Average rainfall in January:
68.8mm - Average rainfall in February:
49.3mm - Average rainfall in March:
51.6mm - Average rainfall in April:
42.4mm - Average rainfall in May:
43.4mm - Average rainfall in June:
42mm
- Average rainfall in July:
44.5mm - Average rainfall in August:
50mm - Average rainfall in September:
53.7mm - Average rainfall in October:
86.2mm - Average rainfall in November:
83.2mm - Average rainfall in December:
83.9mm
The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the least rainfall) is June (42mm).
Average rainfall days
Portsmouth, United Kingdom
- Average rainfall days in January:
11.2 days - Average rainfall days in February:
9.5 days - Average rainfall days in March:
8.3 days - Average rainfall days in April:
7.6 days - Average rainfall days in May:
6.5 days - Average rainfall days in June:
7.4 days
- Average rainfall days in July:
5.4 days - Average rainfall days in August:
6.6 days - Average rainfall days in September:
8.5 days - Average rainfall days in October:
10.9 days - Average rainfall days in November:
10.3 days - Average rainfall days in December:
11.2 days
The months with the highest number of rainy days are January and December (11.2 days).
The month with the least 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 daylight in January:
8h and 3min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 3min - Average daylight in June:
16h and 2min
- Average daylight in July:
16h and 0min - Average daylight in August:
14h and 3min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
9h and 0min - Average daylight in December:
8h and 0min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in January:
2h and 1min - Average sunshine in February:
3h and 1min - Average sunshine in March:
4h and 2min - Average sunshine in April:
6h and 4min - Average sunshine in May:
7h and 5min - Average sunshine in June:
8h and 2min
- Average sunshine in July:
8h and 2min - Average sunshine in August:
7h and 5min - Average sunshine in September:
5h and 5min - Average sunshine in October:
3h and 5min - Average sunshine in November:
2h and 4min - Average sunshine in December:
2h and 0min
The month with the most sunshine is July (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average UV index
Portsmouth, United Kingdom
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
