Weather Forecast for Portsmouth

Hampshire, United Kingdom

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Sunny

Current Weather - Portsmouth: 26°C

Hampshire, United Kingdom

Sunny

Feels like 28°C

Wind

16 km/h NNE

Humidity

79%

Pressure

1017 mb

UV Index

3

Visibility

10 km

Sunny

Sunny

Wednesday, June 24, 2026

High

28°C

Low

20°C

Rain Chance

6%

Hourly Forecast

Sunny 26°C
10:00
Sunny 27°C
11:00
Sunny 27°C
12:00
Sunny 27°C
13:00
Sunny 28°C
14:00
Sunny 28°C
15:00
Sunny 28°C
16:00
Sunny 28°C
17:00
Sunny 28°C
18:00
Sunny 28°C
19:00
Sunny 26°C
20:00
Sunny 25°C
21:00
Clear 23°C
22:00
Clear 22°C
23:00
Jun 25

Day Statistics

Maximum Wind

16 km/h

Humidity

71%

Precipitation

0 mm

UV Index

8

Visibility

10 km

Rain Chance

6%

Snow Chance

0%

Sun & Moon

Sunrise

04:51 AM

Sunset

09:21 PM

Moonrise

04:32 PM

Moonset

01:16 AM

Moon Phase

Waxing Gibbous

Moon Illumination

79%

Air Quality

PM2.5

16.7

μg/m³

PM10

26.8

μg/m³

NO₂

13

μg/m³

O₃

109

μg/m³

SO₂

0.9

μg/m³

CO

180.7

μg/m³

US EPA Index: 2 GB DEFRA Index: 2

Solar Radiation Data

Shortwave Radiation

381.58

Diffuse Radiation

70.78

DNI

0

GTI

0

Weather Alerts

An exceptional spell of hot and humid weather is expected across this region, with impacts to the general population highly likely.

East Midlands | East of England | London & South East England | South West England | Wales | West Midlands Jun 24, 08:00 AM - Jun 25, 08:00 PM
Severity: Extreme Urgency: Future

During the heatwave expected to affect a large part of England and Wales this week, the highlighted area now looks increasingly likely to see a two to three day period where maximum temperatures in the shade exceed 37 Celsius, perhaps rising to 38 to 40 Celsius in some places. The heat will be accompanied by high humidity, exacerbating the potential for discomfort and health impacts, with very warm and humid night times also reducing the ability for people to recover overnight. Significant disruption to daily life is likely and the public should take every effort to make precautions and adapt their daily routines where possible to cope with these levels of heat, which up to now have been extremely rare for the UK. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings

Keep yourself safe by following these simple steps to reduce the likelihood of the heat making you feel unwell; drink plenty of fluids, keep out of the sun and avoid any exercise between 11am-3pm when the sun is strongest and close curtains in rooms that face the sun. If you are going out take water with you, stay in the shade, wear sunscreen and a wide brimmed hat. Keep yourself safe whilst enjoying the water in this weather by following these simple steps: enter the water gradually, avoiding jumping or diving straight in, to reduce your risk of cold-water shock, go to a lifeguarded beach or a supervised swimming area, and, if you, or anyone else, get into difficulty in the water, float on your back. Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary. If using public transport, there are many simple things you can do to keep yourself safe; carry water with you, take a small hand-held battery powered fan, if you feel unwell get off at next stop for some fresh air, dress in light fabrics in light colours to help stay cooler, keep an eye on fellow passengers for signs they may be struggling. Help to protect vulnerable people that you know including older people, those with underlying conditions and those who live alone; they may need support to keep cool and stay hydrated. If you are worried about your health, or that of somebody you know, ring NHS 111. People cope better with power cuts when they have prepared for them in advance. It’s easy to do; consider gathering torches and batteries, a mobile phone power pack and other essential items. Stay up to date with the weather forecast for your area and follow any advice from emergency services and local authorities.

Event: Red extreme_heat warning Certainty: Likely Category: Met

Hot and humid weather is expected to continue through the middle of the week, with exceptionally warm temperatures both day and night.: UPDATED

East Midlands | East of England | London & South East England | North West England | South West England | Wales | West Midlands | Yorkshire & Humber Jun 23, 11:00 PM - Jun 25, 10:59 PM
Severity: Severe Urgency: Future

Information on update: The warning area has been expanded, particularly across northern England, south Wales and southwest England. Very hot weather will continue in general until at least Thursday across the highlighted region, although some variations from place to place and day by day are likely. Temperatures by day are widely expected to exceed 30 Celsius, with the hottest areas potentially peaking around 38-40 Celsius within the embedded red warning. Overnight, temperatures are unlikely to fall much lower than high teens Celsius, and some places will not fall below low 20s Celsius. These high temperatures will also be accompanied by high humidity. Cooler conditions may begin to become established from the west following this period, but confidence is low. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings

Keep yourself safe by following these simple steps to reduce the likelihood of the heat making you feel unwell; drink plenty of fluids, keep out of the sun and avoid any exercise between 11am-3pm when the sun is strongest and close curtains in rooms that face the sun. If you are going out take water with you, stay in the shade, wear sunscreen and a wide brimmed hat. Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary. If using public transport, there are many simple things you can do to keep yourself safe; carry water with you, take a small hand-held battery powered fan, if you feel unwell get off at next stop for some fresh air, dress in light fabrics in light colours to help stay cooler, keep an eye on fellow passengers for signs they may be struggling. Help to protect vulnerable people that you know including older people, those with underlying conditions and those who live alone; they may need support to keep cool and stay hydrated. If you are worried about your health, or that of somebody you know, ring NHS 111. Keep yourself safe whilst enjoying the water in this weather by following these simple steps: enter the water gradually, avoiding jumping or diving straight in, to reduce your risk of cold-water shock, go to a lifeguarded beach or a supervised swimming area, and, if you, or anyone else, get into difficulty in the water, float on your back. People cope better with power cuts when they have prepared for them in advance. It’s easy to do; consider gathering torches and batteries, a mobile phone power pack and other essential items. Stay up to date with the weather forecast for your area and follow any advice from emergency services and local authorities.

Event: Amber extreme_heat warning Certainty: Likely Category: Met