Normal weather for Portsmouth in August
It's hot in August in Portsmouth with an average temperature of 31°C. Temperatures this month range from a low of 31°C to a high of 32°C. At night, you can expect temperatures between 24°C and 26°C.
In August, there is an average of 268 mm of precipitation, spread over 25 days. The wind speed is around 4 Bft, mostly coming from the East.
Portsmouth in August |
London | ||
|---|---|---|---|
 Average Temperature |
31°C | 22°C | |
 High Temp |
32°C | 24°C | |
| Low Temp |
31°C | 19°C | |
 Total Precipitation |
268 mm | 60 mm | |
| Rainy Days |
25 days | 10 days | |
Start of August
The month of August starts in Portsmouth with hot temperatures, averaging around 32°C during the day and nights close to 25°C. Plenty of days with a chance of precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-August
By mid-August, the average daytime temperature stays the same at 32°C, with nights close to 25°C. The chance of precipitation is high during this period. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of August
By the end of August, the average daytime temperature in Portsmouth will be around 32°C, with nights close to 25°C. There’s a significant chance of many days with precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Discover cheap trips to Portsmouth 
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is August a good time to visit Portsmouth?
After some sun? Then August isn’t the best time to be in Portsmouth. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Portsmouth in August
With 37°C, Portsmouth hit the highest temperature in the last 10 years in August 2023. The lowest daytime temperature in this month was 27°C in 2018. The extreme night temperatures ranged from a low of 8°C to a high of 28°C.
Check out the climate of Portsmouth for all months and discover the best travel time
July
Plan your next holiday
Don’t miss the best holiday deals for Portsmouth and see what our partners have for you.
Daily Temperature in August in Portsmouth
This chart shows the average daily temperatures, both day and night, for each day in August in Portsmouth, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in August in Portsmouth
The chart below shows the average daily precipitation in August for Portsmouth, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for August, you can expect around 25 days of rain in Portsmouth.
Daily UV Index in August in Portsmouth
This chart shows the average daily UV index in August in Portsmouth, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in August in Portsmouth Over the Years
This chart shows the average temperature in August in Portsmouth, measured in degrees Celsius, over the past years.
Total Precipitation in August in Portsmouth Over the Years
This chart shows the average precipitation in August in Portsmouth, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in August for Portsmouth
Click on a specific day in August for detailed info on the typical weather on that day in Portsmouth. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in Portsmouth
Have you been to Portsmouth in August?
Share your weather experience in August in Portsmouth.
Average Weather in Portsmouth by Month
Click on a month below to see detailed weather info for Portsmouth. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Portsmouth for all months at once
