Climate averages 1991–2020
Bournemouth weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Bournemouth: daytime highs average 17.9°C and nights cool to about 13.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 54 mm of rain on roughly 9 days, which makes September a moderately wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 41 min on an average September day.
The nearest other city in this atlas is Poole (7 km away). In September its highs average 18.0°C, about as warm as Bournemouth, with 54 mm of rain.
Among the 143 cities listed in the United Kingdom, Bournemouth ranks joint 48th of 143 for the warmest September highs and joint 47th of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Bournemouth is 0.6°C warmer than that mean.
From September to October, average highs fall by 3.4°C to 14.5°C, and monthly rainfall rises from 54 mm to 82 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bournemouth climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.1°C4.5°C | 4.5°C | 71 | 12.3 | 8.59 h |
| February | 8.1°C4.1°C | 4.1°C | 54 | 9.9 | 10.010 h |
| March | 9.9°C5.0°C | 5.0°C | 49 | 9.6 | 11.812 h |
| April | 12.4°C6.6°C | 6.6°C | 53 | 10.1 | 13.814 h |
| May | 15.5°C9.5°C | 9.5°C | 51 | 9.7 | 15.515 h |
| June | 18.1°C12.3°C | 12.3°C | 51 | 9.7 | 16.416 h |
| July | 20.1°C14.3°C | 14.3°C | 47 | 9.3 | 16.016 h |
| August | 20.0°C14.6°C | 14.6°C | 63 | 9.4 | 14.515 h |
| September, selected | 17.9°C13.0°C | 13.0°C | 54 | 9.0 | 12.713 h |
| October | 14.5°C10.6°C | 10.6°C | 82 | 11.9 | 10.811 h |
| November | 11.1°C7.5°C | 7.5°C | 84 | 12.2 | 9.09 h |
| December | 8.7°C5.3°C | 5.3°C | 78 | 11.8 | 8.18 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Poole in SeptemberUnited Kingdom · 7 kmHigh 18.0°C · Low 13.0°C · 54 mm rain
- Southampton in SeptemberUnited Kingdom · 39 kmHigh 18.1°C · Low 12.0°C · 54 mm rain
- Portsmouth in SeptemberUnited Kingdom · 56 kmHigh 18.3°C · Low 12.2°C · 62 mm rain
- Bath in SeptemberUnited Kingdom · 80 kmHigh 17.5°C · Low 10.6°C · 56 mm rain
- Basingstoke in SeptemberUnited Kingdom · 82 kmHigh 18.0°C · Low 10.8°C · 52 mm rain
- Swindon in SeptemberUnited Kingdom · 93 kmHigh 17.6°C · Low 10.4°C · 54 mm rain
- Bristol in SeptemberUnited Kingdom · 96 kmHigh 17.8°C · Low 11.0°C · 56 mm rain
- Reading in SeptemberUnited Kingdom · 104 kmHigh 18.2°C · Low 10.9°C · 51 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bournemouth) is explained once on the Bournemouth year overview and on the Sources, method and limits page.
Poole lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.