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Plymouth Weather in September
September in Plymouth brings pleasant temperatures, with daytime highs of 18°C (64°F) and nights around 12°C (54°F). Rainfall is at its lowest this month, making it one of the more reliable months to be outdoors.
Rainfall in Plymouth in September
Expect fewer clouds and less rain as the month goes on. This makes it an ideal time for outdoor activities. Based on our climate data of the past 30 years, about 15 days of rain are anticipated, with 68 mm (2.7 in) on average. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Plymouth in September
Daytime highs in Plymouth in September reach 18°C (64°F), with nights around 12°C (54°F). This month falls in the summer season. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Plymouth in September
You can expect a moderate amount of sunlight, with approximately 162 hours. This means a pleasant mix of sun and overcast.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Plymouth Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
18°C (64°F)
Chance of Rain
50%
Precipitation
68 mm (2.7 in)
Rainy days
15 days
Humidity
83%
Sunshine
162 hours
Percentage Sunshine
Plymouth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Plymouth - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Plymouth typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 11°C (52°F) to 13°C (55°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Plymouth in September
Browse day-by-day weather records for Plymouth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Plymouth historical weather extremes in September
According to our 49 years of weather records for Plymouth, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Plymouth reached 27°C (81°F) (September 7, 2021).
- Plymouth experienced its chilliest September day on September 15, 1986, reaching only 12°C (54°F).
- The coldest night in September in Plymouth was on September 26, 2010, with a minimum of 4°C (39°F).
- The heaviest September precipitation occurred on September 3, 2017, when 47 mm (1.9 in) of precipitation fell.
Best Places in the United Kingdom in September
Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month. See all of the United Kingdom in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Plymouth in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Plymouth in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Barbeque7/10 -
Camping8/10 -
Outdoor sports10/10
Plymouth 3-Day Forecast
More climate data for Plymouth
Temperature Rainfall Sunshine Humidity
See the full Plymouth climate overview or explore weather in the United Kingdom.
Popular in September
Where to go in September - average daytime high across popular destinations.
London
20°C (68°F) Bath19°C (66°F) Torquay19°C (66°F) Manchester
18°C (64°F) York19°C (66°F) Edinburgh17°C (63°F) Blackpool17°C (63°F) Glasgow17°C (63°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Hike the South West Coast Path
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