Climate averages 1991–2020
Portsmouth weather
in October.
A cool, wet month: the 6th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cool month in Portsmouth: daytime highs average 14.7°C and nights cool to about 9.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 96 mm of rain on roughly 13 days, which makes October a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 46 min on an average October day.
The nearest other city in this atlas is Southampton (25 km away). In October its highs average 14.5°C, about as warm as Portsmouth, with 75 mm of rain.
Among the 143 cities listed in the United Kingdom, Portsmouth ranks joint 1st of 143 for the warmest October highs and 124th of 143 for the driest October (rainfall, lowest first). The mean October high of those 143 cities is 13.6°C; Portsmouth is 1.1°C warmer than that mean.
From October to November, average highs fall by 3.8°C to 11.0°C, and monthly rainfall rises from 96 mm to 99 mm.
The annual picture
October 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
Portsmouth climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.9°C3.7°C | 3.7°C | 83 | 13.4 | 8.58 h |
| February | 8.1°C3.3°C | 3.3°C | 61 | 10.6 | 10.010 h |
| March | 10.3°C4.4°C | 4.4°C | 50 | 10.0 | 11.812 h |
| April | 12.9°C6.0°C | 6.0°C | 52 | 9.7 | 13.814 h |
| May | 16.0°C9.0°C | 9.0°C | 50 | 9.1 | 15.515 h |
| June | 18.7°C11.8°C | 11.8°C | 51 | 9.4 | 16.416 h |
| July | 20.8°C14.0°C | 14.0°C | 52 | 9.6 | 16.016 h |
| August | 20.6°C14.1°C | 14.1°C | 64 | 9.9 | 14.515 h |
| September | 18.3°C12.2°C | 12.2°C | 62 | 10.2 | 12.713 h |
| October, selected | 14.7°C9.7°C | 9.7°C | 96 | 13.4 | 10.811 h |
| November | 11.0°C6.5°C | 6.5°C | 99 | 13.8 | 9.09 h |
| December | 8.4°C4.3°C | 4.3°C | 92 | 13.4 | 8.08 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
October in nearby cities
- Southampton in OctoberUnited Kingdom · 25 kmHigh 14.5°C · Low 9.6°C · 75 mm rain
- Worthing in OctoberUnited Kingdom · 50 kmHigh 14.6°C · Low 10.3°C · 105 mm rain
- Basingstoke in OctoberUnited Kingdom · 52 kmHigh 14.1°C · Low 8.2°C · 66 mm rain
- Bournemouth in OctoberUnited Kingdom · 56 kmHigh 14.5°C · Low 10.6°C · 82 mm rain
- Guildford in OctoberUnited Kingdom · 61 kmHigh 14.6°C · Low 8.4°C · 62 mm rain
- Poole in OctoberUnited Kingdom · 64 kmHigh 14.6°C · Low 10.6°C · 82 mm rain
- Hove in OctoberUnited Kingdom · 65 kmHigh 14.5°C · Low 10.2°C · 108 mm rain
- Brighton in OctoberUnited Kingdom · 67 kmHigh 14.5°C · Low 10.2°C · 108 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 Portsmouth) is explained once on the Portsmouth year overview and on the Sources, method and limits page.