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:
17°C
62.6°F
°C °F

Condition: Partly Cloudy

Pressure: 1,025 hPa

Feel like: 18 °C

Temperature: 17°C

Cloud: 61%

Humidity: 86%

Wind: E - 4 km/h

Visibility: 19.26 km

Weather forecast

Thu
24 Sep
15°C / 20°C
Overcast
Fri
25 Sep
13°C / 19°C
Overcast
Sat
26 Sep
15°C / 20°C
Overcast
Sun
27 Sep
14°C / 19°C
Drizzle
Mon
28 Sep
15°C / 19°C
Overcast
Hourly forecast today:
00:00 AM
14° / 17°
14° / 17°
Partly Cloudy
86% 9 km/h
01:00 AM
14° / 16°
14° / 16°
Clear Sky
88% 10 km/h
02:00 AM
14° / 16°
14° / 16°
Mainly Clear
89% 9 km/h
03:00 AM
14° / 16°
14° / 16°
Clear Sky
91% 8 km/h
04:00 AM
14° / 15°
14° / 15°
Mainly Clear
92% 5 km/h
05:00 AM
14° / 15°
14° / 15°
Partly Cloudy
92% 6 km/h
06:00 AM
14° / 15°
14° / 15°
Clear Sky
93% 5 km/h
07:00 AM
14° / 16°
14° / 16°
Clear Sky
90% 2 km/h
08:00 AM
14° / 17°
14° / 17°
Clear Sky
85% 11 km/h
09:00 AM
14° / 18°
14° / 18°
Overcast
80% 11 km/h
10:00 AM
12° / 19°
12° / 19°
Overcast
64% 24 km/h

30 Day Averages and Extremes

  • Average high 18.17°C
  • Average low 12.73°C
  • Hottest day 22°C (14 September 2026)
  • Coldest day 0°C (05 October 2026)
  • Average humidity 69.93%
  • Days with precipitation 21 days
  • Highest precipitation 63 mm (07 September 2026)

Yesterday's Data

  • Max: 22°C
  • Min: 14°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 mild weather in Portsmouth, with temperatures between 14ºC to 17ºC (57.2ºF to 62.6ºF), consider wearing:
- Lightweight sweater or cardigan
- Comfortable jeans or slacks
- Light jacket (for cooler periods)
- Casual sneakers or loafers

Temperature

Early
14°C / 16°C
Morning
14°C / 18°C
Afternoon
11°C / 22°C
Evening
7°C / 15°C

Air quality

Moderate

Acceptable air quality, some pollutants present, minor health concerns for sensitive individuals

  • CO2 442
  • CO 197
  • NH3 1
  • NO2 21
  • O3 45
  • PM10 20
  • PM25 14
  • SO2 1
  • CH4 1,424

Sunrise / Sunset

05:53
17:58