Boston weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Boston September weather at a glance
In September, Boston averages 18.2°C, with typical highs of 22.9°C and lows of 14.1°C. The historical average is 8 wet days and 75% humidity.
Boston September temperature & humidity
Boston September rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in Boston in September
T-shirts or long sleeves with one light outer layer should be comfortable.
- DaytimeLong sleeves and a light jacket · average high 22.9°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 14.1°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Boston September sunrise & sunset times
2026 September · Local time (America/New_York)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:10 | 19:18 | 13h 9m |
| 2026-09-15 | 06:24 | 18:54 | 12h 30m |
| 2026-09-30 | 06:40 | 18:27 | 11h 47m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
Boston travel updates
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No public camera link is available for this destination yet. Check the weather or map instead.
Today’s weather and forecast
Check temperature, rain and wind in Windy.
Forecast · Windy. Monthly averages are in the Temperature section.
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Boston city map
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Boston travel essentials
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Best months to visit Boston
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Boston weather like in September?
In September, Boston averages 18.2°C, with typical highs of 22.9°C and lows of 14.1°C. The historical average is 8 wet days and 75% humidity. Our weather-comfort rating for this month is excellent.
Does it rain a lot in Boston in September?
There are about 8 wet days in September. A compact umbrella is still useful.
What should I wear in Boston in September?
T-shirts or long sleeves with one light outer layer should be comfortable.
What are the best months to visit Boston?
Recent weather data rates June, August, September, October among the more comfortable months.
Where can I check Boston weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Boston in September?
On 2026-09-15, calculated sunrise is 06:24 and sunset is 18:54 in local time (America/New_York). Times vary by date and terrain.
Boston weather by month
More Americas destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations