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September Weather in Lynn, United States

Last updated: June 24, 2025

In September, the average temperature in Lynn, United States hovers around 20°C (69°F). Expect a minimum of 4°C (40°F) and occasional highs of 33°C (91°F). During this month, precipitation totals approximately 91 mm (3.6 in) over 7 days, while the average humidity tends to be around 69%.

September Temperature in Lynn

In September in Lynn, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (91°F), while minimum temperatures can drop as low as 4°C (40°F). This range of temperatures makes Lynn a great destination for outdoor activities and versatile wardrobe choices during your travels.

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

The chart illustrates September temperature patterns in Lynn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lynn, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293342516372757368574135
Data source: Temperature data for Lynn 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 Lynn

In Lynn in September, the precipitation amount is 91 mm (3.6 in) over a span of 7 days.

September Precipitation Trends in Lynn

The chart displays monthly precipitation patterns in Lynn, 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 Lynn, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec76971161021421251099591989181
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lynn

In Lynn in September humidity is 69%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping embrace, making travel feel both refreshing and slightly sticky, as you navigate the vibrant atmosphere with a pleasant sheen of perspiration glistening on your skin.

September Average Humidity in Lynn

This chart illustrates the average monthly humidity levels in Lynn, 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 Lynn is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lynn

In Lynn in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Lynn.

Maximum UV Index Levels in Lynn for September

The chart shows the monthly maximum UV Index (UVI) for Lynn 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 Lynn typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Lynn 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 Lynn Compares to Other Months

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

This table compares monthly weather conditions in Lynn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)76 mm (3.0 inches)87%moderate
February Weather0°C (33°F)97 mm (3.8 inches)85%moderate
March Weather5°C (42°F)116 mm (4.6 inches)86%high
April Weather11°C (51°F)102 mm (4.0 inches)84%very high
May Weather17°C (63°F)142 mm (5.6 inches)79%very high
June Weather22°C (72°F)125 mm (4.9 inches)82%extreme
July Weather24°C (76°F)109 mm (4.3 inches)79%very high
August Weather23°C (73°F)95 mm (3.7 inches)70%very high
September Weather20°C (69°F)91 mm (3.6 inches)69%very high
October Weather14°C (57°F)98 mm (3.9 inches)76%high
November Weather5°C (41°F)91 mm (3.6 inches)88%moderate
December Weather2°C (36°F)81 mm (3.2 inches)87%moderate

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