Temperatures in August
It's pleasantly warm in August in Portsmouth with an average temperature of 21°C. Temperatures this month range from a low of 20°C to a high of 23°C. At night, you can expect temperatures between 13°C and 16°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Portsmouth in August. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of August
The month of August starts in Portsmouth with warm temperatures, averaging around 22°C during the day and nights close to 15°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-August
By mid-August, the average daytime temperature stays the same at 22°C, with nights close to 15°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of August
By the end of August, the average daytime temperature in Portsmouth will be around 22°C, with nights close to 15°C. A shower might show up, but overall the weather will be dry and sunny.
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Precipitation in August
In August, there is an average of 68 mm of precipitation, spread over 10 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
The average precipitation chance is 32% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in August for Portsmouth. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Portsmouth in August |
London | ||
|---|---|---|---|
 Average Temperature |
21°C | 22°C | |
 High Temp |
23°C | 24°C | |
| Low Temp |
20°C | 19°C | |
 Total Precipitation |
68 mm | 60 mm | |
| Rainy Days |
10 days | 10 days | |
July
UV index
The UV index is a maximum of 8 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?
Want nice weather? Then August is a great time to be in Portsmouth. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Portsmouth in August
With 32°C, Portsmouth hit the highest temperature in the last 10 years in August 2022. The lowest daytime temperature in this month was 14°C in 2017. The extreme night temperatures ranged from a low of 6°C to a high of 21°C.
Check out the climate of Portsmouth for all months and discover the best travel time
Curious about the climate in other parts of England? Check out the weather and climate in places like London, Edinburgh, Cornwall, or have a look at other destinations in England.
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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 10 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
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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
