September Weather in Lynn, United States

Last updated: June 24, 2025

In Lynn, United States, the average temperature in September hovers around 25°C (76°F). Expect a range from a cool 11°C (52°F) to a sizzling 37°C (99°F). During this month, anticipate 99 mm (3.9 in) of precipitation spread over 8 days, with an average humidity level of 74%. Whether you're exploring or relaxing, be prepared for a mix of weather!

September Temperature in Lynn

In September in Lynn, the average temperature is 25°C (76°F). Maximums can reach 37°C (99°F), and minimums can be as low as 11°C (52°F). This diverse climate makes Lynn an ideal destination for travelers seeking both warmth and refreshing coolness during their visit.

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 25°C (76°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (52°F).

Data source: Temperature data for Lynn generated using information from the Copernicus Climate Change Service.

September Precipitation in Lynn

In Lynn in September, the precipitation amount is 99 mm (3.9 in) spread over 8 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 99 mm (3.9 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Lynn

In Lynn in September, humidity is 74%. With an average temperature of 25°C (76°F), this humidity feels like you're enveloped in a warm, steamy embrace, making outdoor adventures quite challenging and ensuring that plenty of water and shade are essential for a comfortable experience.

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 74%, offering insight into how humid the weather typically is during this month.

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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	119 mm (4.7 inches)	85%	moderate
February Weather	10°C (51°F)	198 mm (7.8 inches)	84%	high
March Weather	14°C (57°F)	178 mm (7.0 inches)	82%	very high
April Weather	17°C (62°F)	165 mm (6.5 inches)	82%	very high
May Weather	22°C (72°F)	113 mm (4.5 inches)	82%	extreme
June Weather	25°C (78°F)	146 mm (5.8 inches)	79%	extreme
July Weather	27°C (81°F)	107 mm (4.2 inches)	82%	extreme
August Weather	27°C (80°F)	122 mm (4.8 inches)	77%	extreme
September Weather	25°C (76°F)	99 mm (3.9 inches)	74%	very high
October Weather	19°C (66°F)	117 mm (4.6 inches)	73%	high
November Weather	11°C (52°F)	76 mm (3.0 inches)	85%	moderate
December Weather	9°C (49°F)	158 mm (6.2 inches)	88%	moderate