Monthly climate guide
Provincetown weather in September
September in Provincetown is typically mild, with average daytime highs around 20°C (67°F) and night-time lows near 17°C (63°F). The month usually brings about 98 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are 3°C cooler than August and 4°C warmer than October.
What stands out in September
- Days and nights are close, only about 2°C apart.
- Temperatures are falling — expect highs around 4°C lower by October.
- Provincetown is usually about 4°C cooler than Boston, 80 km away, in September.
- September is Provincetown's third warmest month.
Avg high
20°C
67°F
Avg low
17°C
63°F
Rainfall
98 mm
wet
Humidity
83%
relative
Sky
50%
cloud · a mix of sun and cloud
Provincetown weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 4°C / 39°F | 0°C / 32°F | 107 mm | 81% | 70% |
| February | 4°C / 39°F | 0°C / 32°F | 110 mm | 80% | 68% |
| March | 5°C / 41°F | 2°C / 35°F | 103 mm | 79% | 63% |
| April | 8°C / 47°F | 5°C / 42°F | 114 mm | 83% | 61% |
| May | 13°C / 55°F | 10°C / 50°F | 85 mm | 88% | 63% |
| June | 18°C / 64°F | 15°C / 59°F | 106 mm | 87% | 57% |
| July | 22°C / 72°F | 20°C / 68°F | 90 mm | 86% | 50% |
| August | 22°C / 72°F | 20°C / 68°F | 82 mm | 85% | 47% |
| September | 20°C / 67°F | 17°C / 63°F | 98 mm | 83% | 50% |
| October | 16°C / 60°F | 13°C / 55°F | 133 mm | 81% | 59% |
| November | 11°C / 51°F | 7°C / 45°F | 115 mm | 79% | 64% |
| December | 7°C / 45°F | 4°C / 38°F | 139 mm | 80% | 72% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Provincetown?
Compare the months in the chart above to find your ideal window.
Best time to visit Provincetown →Other United States cities in September
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Provincetown weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/provincetown/september
<a href="https://weathercompare.eu/weather/usa/provincetown/september">Provincetown weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/provincetown" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Provincetown weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/provincetown/september">Provincetown weather in September</a> – WeatherCompare</p>
Provincetown in September: quick answers
Is September a good time to visit Provincetown?
Yes. September is one of the best months for Provincetown, with highs around 20°C and about 98 mm of rain.
How warm is Provincetown in September?
Average highs are about 20°C (67°F) and average lows about 17°C (63°F), based on 10 years of daily data.
Does it rain a lot in Provincetown in September?
Provincetown typically gets around 98 mm of rain in September — wet.
Figures are long-term averages for the area around Provincetown (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.