September Weather in Hamilton, United States

Last updated: June 24, 2025

In September, the average temperature in Hamilton, United States is a pleasant 21°C (71°F). However, temperatures can vary significantly, with a minimum of 6°C (44°F) and a maximum reaching 33°C (92°F). Expect 93 mm (3.6 in) of precipitation spread over 9 days, and enjoy a comfortable average humidity level of 72%.

September Temperature in Hamilton

In September in Hamilton, the average temperature is 21°C (71°F). Maximums can reach 33°C (92°F), while minimums can be as low as 6°C (44°F). Overall, it's a great time to travel to Hamilton for pleasant weather and diverse temperature variations.

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

The chart illustrates September temperature patterns in Hamilton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hamilton, September typically has an average temperature of 21°C (71°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Hamilton

In Hamilton in September, the precipitation amount is 93 mm (3.6 in) during a span of 9 days.

September Precipitation Trends in Hamilton

The chart displays monthly precipitation patterns in Hamilton, 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 Hamilton, September typically receives around 93 mm (3.6 inches) of precipitation spread over approximately 9 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 Hamilton

In Hamilton in September, humidity is 72%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, creating a thick, sultry atmosphere that can be quite heavy for traveling.

September Average Humidity in Hamilton

This chart illustrates the average monthly humidity levels in Hamilton, 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 Hamilton is approximately 72%, 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 Hamilton

In Hamilton 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 Hamilton.

Maximum UV Index Levels in Hamilton for September

The chart shows the monthly maximum UV Index (UVI) for Hamilton 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 Hamilton typically reaches 9, which falls under the very high exposure category.

Data source: Hamilton 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 Hamilton Compares to Other Months

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

This table compares monthly weather conditions in Hamilton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	54 mm (2.1 inches)	80%	moderate
February Weather	-1°C (31°F)	40 mm (1.6 inches)	78%	moderate
March Weather	7°C (45°F)	98 mm (3.8 inches)	75%	high
April Weather	12°C (53°F)	84 mm (3.3 inches)	77%	very high
May Weather	18°C (65°F)	200 mm (7.9 inches)	82%	very high
June Weather	25°C (76°F)	133 mm (5.2 inches)	83%	extreme
July Weather	26°C (79°F)	110 mm (4.3 inches)	81%	extreme
August Weather	24°C (76°F)	98 mm (3.9 inches)	78%	very high
September Weather	21°C (71°F)	93 mm (3.6 inches)	72%	very high
October Weather	13°C (56°F)	134 mm (5.3 inches)	72%	high
November Weather	6°C (43°F)	50 mm (2.0 inches)	84%	moderate
December Weather	2°C (36°F)	33 mm (1.3 inches)	86%	moderate