Portsmouth, United Kingdom Weather

  1. Portsmouth, United Kingdom Weather
  2. Current conditions
  3. Weather forecast
  4. Averages and extremes
  5. Yesterday's Data
  6. Temperature and possibility of rain in Portsmouth over the next 12 hours
  7. Temperature and possibility of rain in Portsmouth in the coming days
  8. Rainfall in Portsmouth in the coming days
  9. Portsmouth Weather Summary
  10. Weather averages by month
  11. Portsmouth's weather
  12. Frequently asked questions
  13. Comments
Portsmouth, Weather
(Photo by Viktor Forgacs on Unsplash)

Current conditions

Updated:
18°C
64.4°F
°C °F

Condition: Clear Sky

Pressure: 1,021 hPa

Feel like: 18 °C

Temperature: 18°C

Cloud: 0%

Humidity: 73%

Wind: W - 7 km/h

Visibility: 29.32 km

Weather forecast

Sat
08 Aug
18°C / 27°C
Overcast
Sun
09 Aug
17°C / 27°C
Overcast
Mon
10 Aug
17°C / 27°C
Partly Cloudy
Tue
11 Aug
18°C / 26°C
Clear Sky
Wed
12 Aug
18°C / 29°C
Partly Cloudy
Hourly forecast today:
23:00 PM
13° / 18°
13° / 18°
Clear Sky
73% 14 km/h
00:00 AM
12° / 17°
12° / 17°
Clear Sky
75% 11 km/h
01:00 AM
12° / 16°
12° / 16°
Clear Sky
81% 5 km/h
02:00 AM
12° / 15°
12° / 15°
Clear Sky
82% 14 km/h
03:00 AM
12° / 15°
12° / 15°
Clear Sky
85% 14 km/h
04:00 AM
13° / 15°
13° / 15°
Clear Sky
86% 14 km/h
05:00 AM
12° / 15°
12° / 15°
Clear Sky
87% 13 km/h
06:00 AM
13° / 16°
13° / 16°
Clear Sky
84% 12 km/h
07:00 AM
12° / 18°
12° / 18°
Clear Sky
71% 15 km/h
08:00 AM
12° / 19°
12° / 19°
Clear Sky
61% 21 km/h
09:00 AM
12° / 21°
12° / 21°
Overcast
57% 25 km/h

30 Day Averages and Extremes

  • Average high 23.27°C
  • Average low 15.27°C
  • Hottest day 29°C (12 August 2026)
  • Coldest day 0°C (20 August 2026)
  • Average humidity 56.57%
  • Days with precipitation 11 days
  • Highest precipitation 21 mm (04 August 2026)

Yesterday's Data

  • Max: 23°C
  • Min: 13°C
  • Total Precipitation: 0 mm

Temperature and possibility of rain in Portsmouth over the next 12 hours

Temperature and possibility of rain in Portsmouth in the coming days

Rainfall in Portsmouth in the coming days

Portsmouth Climate Summary

Portsmouth features a Marine west coast, warm summer (Köppen classification: Cfb), with an average annual temperature of 11.99ºC (53.58ºF), which is about 1.24% higher than the national average for United Kingdom. Annually, the city experiences approximately 81.04 millimeters (3.19 inches) of rainfall, spread across 148.63 rainy days, accounting for 40.72% of the year.

Longitude 50.8197675
Latitude -1.0879769
Yearly high temperature 13.5ºC (56.3ºF)
Yearly low temperature 9.07ºC (48.33ºF)
Hottest month July 19.55ºC (67.19ºF)
Coldest month January 4.66ºC (40.39ºF)
Yearly precip 81.04mm (3.19in)
Days with rainfall 148.63 days (40.72%)
Driest month April (80.01%)
Wettest month October (80.96%)

Weather averages by month

Month High / Low (°C) Rain
January 7.94° / 4.66° 13.91 days
February 7.89° / 4.49° 12.18 days
March 9.76° / 5.29° 10.27 days
April 12.19° / 6.77° 9.82 days
May 14.55° / 9.19° 11.27 days
June 17.27° / 11.9° 11.45 days
July 19.55° / 14.04° 13.0 days
August 19.41° / 14.44° 12.73 days
September 17.98° / 13.16° 10.18 days
October 14.99° / 11.07° 14.27 days
November 11.29° / 7.97° 15.73 days
December 9.13° / 5.89° 13.82 days

Portsmouth's weather

Frequently asked questions

1. What is the hottest month in Portsmouth?

July has the highest average monthly temperature (daily mean of 19.55ºC) and January are the coolest (daily mean of 4.66ºC).

2. What should I wear in Portsmouth today?

For today's very hot weather in Portsmouth, with the high temperatures above 25ºC (77.0ºF), consider wearing:
- Wide-brimmed sun hat
- Open-toed sandals or light sneakers
- Sunscreen for skin protection
- UV-protective sunglasses

Temperature

Early
9°C / 14°C
Morning
7°C / 18°C
Afternoon
8°C / 23°C
Evening
13°C / 18°C

Air quality

Good

Satisfactory air quality, minimal pollution, low risk

  • CO2 440
  • CO 143
  • NH3 2
  • NO2 23
  • O3 45
  • PM10 9
  • PM25 6
  • SO2 2
  • CH4 1,378

Sunrise / Sunset

04:42
19:38