Weather in Southampton in August 2025
- August is usually the hottest month of the year in Southampton;
Average weather
Average temperature in Southampton in August
The temperature in August is +21°C on average, with a range between a maximum of +25°C during the day and a minimum of +9°C at night.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +21°C to +17°C.
Is Southampton warm or cold in August?
Southampton is typically mild in August.
Maximum temperatures go up compared to the previous month from +21°C to +21°C. The minimum temperature also goes up from +13°C to +13°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
August is the hottest month in Southampton, here is the comparison with other months:
Climate in Southampton in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +21°C | +19°C | ||||
| Min. temperature | ||||||
| +6°C | +4°C | 0°C | ||||
| Max. temperature | ||||||
| +33°C | +33°C | +30°C | ||||
| Rainfall | ||||||
| 55 mm | 62 mm | 56 mm | ||||
| Wind | ||||||
| 4 m/s | 3 m/s | 4 m/s | ||||
| Humidity | ||||||
| 77% | 79% | 82% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 4 | 4 | 4 | ||||
| Cloudy days | ||||||
| 9 | 11 | 12 | ||||
| Rainy days | ||||||
| 16 | 16 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. The temperature levels stay the same in the area of +21°C for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 55 mm to 62 mm. Humidity rises from 77% to 79%. Winds are calmer in comparison to July, going down from 4 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 4 sunny days during the month.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Southampton is gradually decreasing during August, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last August in Southampton?
Climate Change over Years
The climate in Southampton in August has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+12°C) and the highest in 2022 (+16°C). The driest year was 1990 with only 529 mm of rainfall, and the wettest year was 2020 with 1617 mm.
FAQ
Is August a good time to visit Southampton?
Can you sunbathe in Southampton in August?
Is Southampton rainy in August?
Is it sunny in Southampton in August?
Other cities in United Kingdom
Monthly weather in Southampton
Source of the data
For this page, we’ve looked at the typical weather in Southampton, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.