Portsmouth in September
7.6out of 10
Yes, a good time to go
Mild: highs around 20°C. Frequent rain: about 9 rainy days.
20°CAvg high
17°CAvg low
9Rainy days (105 mm)
12:16 hDaylight
06:31Sunrise · 18:47 Sunset
Why this score
- Mild: highs around 20°C
- Frequent rain: about 9 rainy days
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.3 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 4°C | -2°C | 112 mm | 11 | – | – | 4.3 |
| February | 4°C | -2°C | 97 mm | 10 | – | – | 4.5 |
| March | 6°C | 1°C | 129 mm | 10 | – | – | 4.7 |
| April | 10°C | 6°C | 116 mm | 11 | – | – | 5.4 |
| May | 14°C | 11°C | 99 mm | 11 | – | – | 6.3 |
| June | 19°C | 16°C | 94 mm | 9 | – | – | 7.3 |
| July | 23°C | 20°C | 75 mm | 8 | – | – | 8.0 |
| August | 23°C | 20°C | 92 mm | 9 | – | – | 7.9 |
| September | 20°C | 17°C | 105 mm | 9 | – | – | 7.6 |
| October | 16°C | 12°C | 129 mm | 10 | – | – | 6.5 |
| November | 11°C | 6°C | 113 mm | 10 | – | – | 5.9 |
| December | 7°C | 2°C | 135 mm | 12 | – | – | 4.8 |
Frequently asked questions
How hot is Portsmouth in September?
Daytime highs average 20°C and nights about 17°C.
When is the best time to visit Portsmouth?
The best months are July, August, September.