Monthly climate guide
Plymouth weather in September
September in Plymouth is typically mild, with average daytime highs around 17°C (63°F) and night-time lows near 12°C (53°F). The month usually brings about 80 mm of rain (some rain) and is often cloudy. Daytime highs are about the same as August and 3°C warmer than October.
What stands out in September
- There's little difference between day and night (around 5°C).
- September brings early autumn to Plymouth.
- Only 2 months are warmer in Plymouth than September.
- Just 170 km apart, but Plymouth runs about 2°C cooler than Bath this month.
Avg high
17°C
63°F
Avg low
12°C
53°F
Rainfall
80 mm
some rain
Humidity
86%
relative
Sky
66%
cloud · often cloudy
Plymouth weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 8°C / 47°F | 5°C / 41°F | 135 mm | 90% | 78% |
| February | 8°C / 47°F | 4°C / 40°F | 105 mm | 89% | 74% |
| March | 10°C / 49°F | 5°C / 41°F | 89 mm | 88% | 69% |
| April | 12°C / 53°F | 6°C / 43°F | 68 mm | 85% | 63% |
| May | 14°C / 58°F | 9°C / 47°F | 61 mm | 84% | 65% |
| June | 17°C / 62°F | 11°C / 52°F | 94 mm | 85% | 68% |
| July | 19°C / 66°F | 13°C / 56°F | 69 mm | 84% | 65% |
| August | 19°C / 65°F | 13°C / 56°F | 114 mm | 85% | 70% |
| September | 17°C / 63°F | 12°C / 53°F | 80 mm | 86% | 66% |
| October | 14°C / 58°F | 10°C / 50°F | 130 mm | 88% | 73% |
| November | 11°C / 52°F | 8°C / 46°F | 135 mm | 89% | 75% |
| December | 10°C / 50°F | 7°C / 44°F | 161 mm | 90% | 78% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Plymouth?
Compare the months in the chart above to find your ideal window.
Best time to visit Plymouth →Other United Kingdom cities in September
Cite or embed this data
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Plymouth weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/uk/plymouth/september
<a href="https://weathercompare.eu/weather/uk/plymouth/september">Plymouth weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/uk/plymouth" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Plymouth weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/uk/plymouth/september">Plymouth weather in September</a> – WeatherCompare</p>
Plymouth in September: quick answers
Is September a good time to visit Plymouth?
Yes. September is one of the best months for Plymouth, with highs around 17°C and about 80 mm of rain.
How warm is Plymouth in September?
Average highs are about 17°C (63°F) and average lows about 12°C (53°F), based on 10 years of daily data.
Does it rain a lot in Plymouth in September?
Plymouth typically gets around 80 mm of rain in September — some rain.
Figures are long-term averages for the area around Plymouth (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.