🇬🇧 Weather in Portsmouth
Map Overlays:
Hourly Forecast for Portsmouth
19:00
19°
13%
20:00
18°
14%
21:00
18°
16%
22:00
18°
17%
23:00
18°
18%
00:00
17°
20%
01:00
17°
16%
02:00
17°
9%
03:00
16°
21%
04:00
15°
12%
05:00
15°
22%
06:00
15°
22%
07:00
16°
20%
08:00
17°
20%
09:00
17°
18%
10:00
18°
16%
11:00
18°
15%
12:00
19°
13%
13:00
19°
13%
14:00
20°
13%
15:00
20°
12%
16:00
21°
12%
17:00
21°
12%
18:00
21°
2%
14-Day Forecast for Portsmouth
2026-08-23
Overcast
19° /
16°
2026-08-24
Overcast
21° /
15°
2026-08-25
Patchy rain nearby
19° /
16°
2026-08-26
Overcast
21° /
18°
2026-08-27
Patchy rain nearby
20° /
18°
2026-08-28
Light rain shower
20° /
17°
2026-08-29
Patchy rain nearby
20° /
17°
Additional Forecasts for Portsmouth
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 164.0 μg/m³
O₃ (Ozone) 96.0 μg/m³
NO₂ (Nitrogen Dioxide) 5.0 μg/m³
SO₂ (Sulphur Dioxide) 0.4 μg/m³
PM2.5 (Fine particles) 5.7 μg/m³
PM10 (Coarse particles) 10.6 μg/m³
Historical Weather
Weather Forecasts for Other Cities in United Kingdom
Weather in Portsmouth — FAQ
Answers refreshed each request based on current conditions in Portsmouth.
What is the weather like right now in Portsmouth?
Right now in Portsmouth, United Kingdom the temperature is 18.7°C (feels like 16.0°C), with sunny. Relative humidity is 58% and wind is 14.4 km/h.
What is today's high and low temperature in Portsmouth?
Today's forecast high in Portsmouth is 18.8°C and the overnight low is 16.5°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Portsmouth today?
The chance of precipitation in Portsmouth today is 24%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Portsmouth differ from nearby cities?
Even short distances can change temperatures noticeably. Portsmouth's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.