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September Weather in Boston, Philippines

Last updated: August 27, 2025

In September, the average temperature in Boston, Philippines hovers around 26°C (79°F), providing a warm climate for visitors and locals alike. Temperatures can range from a comfortable 21°C (70°F) to a sweltering 32°C (91°F). However, expect 368 mm (14.5 in) of precipitation spread over 25 days, contributing to an average humidity of 85%. Prepare for a blend of warmth and moisture as you explore this vibrant location!

September Temperature in Boston

In September in Boston, the average temperature is 26°C (79°F). Maximums can reach 32°C (91°F), while minimums can drop to 21°C (70°F). This makes Boston an ideal destination for travelers seeking warm and pleasant weather.

September Weather in Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boston, September typically has an average temperature of 26°C (79°F), with highs reaching up to 32°C (91°F) and lows dropping to around 21°C (70°F).
JanFebMarAprMayJunJulAugSepOctNovDec767576777979797979787877
Data source: Temperature data for Boston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Boston

In Boston in September, the total precipitation amount is 368 mm (14.5 in) spread over the course of 25 days.

September Precipitation Trends in Boston

The chart displays monthly precipitation patterns in Boston, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Boston, September typically receives around 368 mm (14.5 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec470423264159265363355317368397276318
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Boston

In Boston in September, humidity is 85%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities feel stifling and exhausting for travelers.

September Average Humidity in Boston

This chart illustrates the average monthly humidity levels in Boston, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Boston is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%92%91%87%84%83%82%83%85%82%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Boston

In Boston in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Boston.

Maximum UV Index Levels in Boston for September

The chart shows the monthly maximum UV Index (UVI) for Boston in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Boston typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131516161514141515141312
Data source: Boston September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Boston Compares to Other Months

Weather in Boston varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Boston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Boston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)470 mm (18.5 inches)90%extreme
February Weather24°C (76°F)423 mm (16.6 inches)92%extreme
March Weather25°C (76°F)264 mm (10.4 inches)90%extreme
April Weather25°C (78°F)159 mm (6.3 inches)87%extreme
May Weather26°C (79°F)265 mm (10.4 inches)83%extreme
June Weather26°C (79°F)363 mm (14.3 inches)83%extreme
July Weather26°C (79°F)355 mm (14.0 inches)82%extreme
August Weather26°C (79°F)317 mm (12.5 inches)83%extreme
September Weather26°C (79°F)368 mm (14.5 inches)85%extreme
October Weather26°C (79°F)397 mm (15.6 inches)82%extreme
November Weather25°C (78°F)276 mm (10.8 inches)83%extreme
December Weather25°C (77°F)318 mm (12.5 inches)87%extreme

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