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: Clear Sky

Pressure: 1,030 hPa

Feel like: 17 °C

Temperature: 17°C

Cloud: 0%

Humidity: 83%

Wind: WNW - 3 km/h

Visibility: 18.74 km

Weather forecast

Tue
22 Sep
12°C / 21°C
Moderate Drizzle
Wed
23 Sep
8°C / 16°C
Overcast
Thu
24 Sep
13°C / 19°C
Drizzle
Fri
25 Sep
10°C / 17°C
Overcast
Sat
26 Sep
14°C / 19°C
Drizzle Dense Intensity
Hourly forecast today:
23:00 PM
14° / 17°
14° / 17°
Clear Sky
83% 8 km/h
00:00 AM
14° / 16°
14° / 16°
Clear Sky
87% 7 km/h
01:00 AM
14° / 16°
14° / 16°
Clear Sky
88% 8 km/h
02:00 AM
14° / 16°
14° / 16°
Mainly Clear
88% 6 km/h
03:00 AM
13° / 16°
13° / 16°
Partly Cloudy
86% 5 km/h
04:00 AM
14° / 16°
14° / 16°
Overcast
89% 11 km/h
05:00 AM
14° / 15°
14° / 15°
Overcast
89% 7 km/h
06:00 AM
14° / 16°
14° / 16°
Overcast
88% 4 km/h
07:00 AM
14° / 16°
14° / 16°
Overcast
86% 4 km/h
08:00 AM
14° / 17°
14° / 17°
Overcast
85% 4 km/h
09:00 AM
14° / 18°
14° / 18°
Partly Cloudy
79% 5 km/h

30 Day Averages and Extremes

  • Average high 18.5°C
  • Average low 12.87°C
  • Hottest day 23°C (30 September 2026)
  • Coldest day 0°C (04 October 2026)
  • Average humidity 70.2%
  • Days with precipitation 23 days
  • Highest precipitation 63 mm (07 September 2026)

Yesterday's Data

  • Max: 21°C
  • Min: 12°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 warm weather in Portsmouth, with temperatures between 18ºC to 21ºC (64.4ºF to 69.8ºF), you might consider wearing:
- Sunscreen (if spending time outdoors)
- T-shirt or short-sleeve blouse
- Sun hat or cap
- Sunglasses

Temperature

Early
8°C / 12°C
Morning
6°C / 15°C
Afternoon
8°C / 21°C
Evening
12°C / 17°C

Air quality

Good

Satisfactory air quality, minimal pollution, low risk

  • CO2 451
  • CO 200
  • NH3 2
  • NO2 34
  • O3 28
  • PM10 16
  • PM25 9
  • SO2 3
  • CH4 1,426

Sunrise / Sunset

05:50
18:02