Average temperatures, rainfall and packing tips for Plymouth, United Kingdom in September
September in Plymouth is typically mild, with average daytime highs around 17°C and nights near 12°C. Temperature-wise it sits mid-range for Plymouth (the 4th warmest month).
September is one of the wetter months in Plymouth, with around 145 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in Plymouth are usually July and August.
← Plymouth weather tomorrow (live)
In September, Plymouth averages a daytime high of about 17°C and a night-time low of around 12°C, based on recent historical data.
September is one of the wetter months in Plymouth, with around 145 mm of rain - plan around showers.
September is a workable time to visit Plymouth, with mild days - just pack accordingly. If your dates are flexible, the most comfortable months in Plymouth are usually July and August.