Weather in Southampton in September 2025
Average weather
Average temperature in Southampton in September
The temperature in September is +22°C on average, with a range between a maximum of +30°C during the day and a minimum of +7°C at night.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +21°C to +19°C.
Is Southampton warm or cold in September?
Southampton is typically mild in September.
Maximum temperatures go down compared to the previous month from +21°C to +19°C. The minimum temperature also goes down from +13°C to +11°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
September is one of the warmest months in Southampton, here is the comparison with other months:
Climate in Southampton in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +19°C | +15°C | ||||
| Min. temperature | ||||||
| +4°C | 0°C | -2°C | ||||
| Max. temperature | ||||||
| +33°C | +30°C | +25°C | ||||
| Rainfall | ||||||
| 62 mm | 56 mm | 87 mm | ||||
| Wind | ||||||
| 3 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 79% | 82% | 85% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 4 | 4 | 3 | ||||
| Cloudy days | ||||||
| 11 | 12 | 11 | ||||
| Rainy days | ||||||
| 16 | 14 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +21°C in the day, the average maximum temperature lowers to +19°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 62 mm to 56 mm. Humidity rises from 79% to 82%. Winds are stronger in comparison to August, going up from 3 m/s to 4 m/s on average. The amount of sunny days stay about the same, averaging 4 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Southampton is gradually increasing during September, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Southampton?
Climate Change over Years
The climate in Southampton in September 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 September a good time to visit Southampton?
Can you sunbathe in Southampton in September?
Is Southampton rainy in September?
Is it sunny in Southampton in September?
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.