Weather in Bristol in September 2025
Average weather
Average temperature in Bristol in September
Going from a maximum of +30°C during the day to a minimum of +8°C during the night, the temperature in September averages around +22°C.
The average maximum temperature goes down 14% by the end of the month, compared with the beginning of the month, from +21°C to +18°C.
Is Bristol warm or cold in September?
Bristol 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 Bristol, here is the comparison with other months:
Climate in Bristol in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +19°C | +15°C | ||||
| Min. temperature | ||||||
| +6°C | +3°C | -2°C | ||||
| Max. temperature | ||||||
| +34°C | +30°C | +26°C | ||||
| Rainfall | ||||||
| 75 mm | 62 mm | 92 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Humidity | ||||||
| 76% | 78% | 82% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 4 | 3 | 3 | ||||
| Cloudy days | ||||||
| 9 | 11 | 10 | ||||
| Rainy days | ||||||
| 17 | 15 | 18 | ||||
| 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 75 mm to 62 mm. Humidity rises from 76% to 78%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 4 sunny days in August to 3 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 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 Bristol is gradually increasing during September, going from 1 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Bristol?
Climate Change over Years
The climate in Bristol 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 2014 (+16°C). The driest year was 2011 with only 525 mm of rainfall, and the wettest year was 2020 with 2079 mm.
FAQ
Is September a good time to visit Bristol?
Can you sunbathe in Bristol in September?
Is Bristol rainy in September?
Is it sunny in Bristol in September?
Other cities in United Kingdom
Monthly weather in Bristol
Source of the data
For this page, we’ve looked at the typical weather in Bristol, 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.