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September Weather in Hamilton, United States

Last updated: June 24, 2025

In September, the average temperature in Hamilton, United States is a pleasant 24°C (76°F), with temperatures ranging from a cool 10°C (51°F) to a warm 37°C (99°F). This month typically sees 108 mm (4.2 in) of precipitation spread over 8 days, contributing to an average humidity level of 70%. Stay prepared for both sunny and rainy days!

September Temperature in Hamilton

In September in Hamilton, the average temperature is 24°C (76°F), with maximums reaching 37°C (99°F) and minimums dipping as low as 10°C (51°F). This makes it an ideal time for travelers seeking warm weather along with comfortable evenings.

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 24°C (76°F), with highs reaching up to 37°C (99°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627277808076665248
Data source: Temperature data for Hamilton 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 Hamilton

In Hamilton in September, the precipitation amount is 108 mm (4.2 in), which occurs over a span of 8 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 108 mm (4.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec11819617417612813611212310811971156
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hamilton

In Hamilton in September, humidity is 70%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel a bit sticky and heavier, so travelers should stay hydrated and take regular breaks to enjoy the sights comfortably.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109754
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.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)118 mm (4.7 inches)86%moderate
February Weather10°C (50°F)196 mm (7.7 inches)85%high
March Weather14°C (57°F)174 mm (6.9 inches)84%very high
April Weather17°C (62°F)176 mm (6.9 inches)81%very high
May Weather22°C (72°F)128 mm (5.0 inches)83%extreme
June Weather25°C (77°F)136 mm (5.4 inches)83%extreme
July Weather27°C (80°F)112 mm (4.4 inches)80%extreme
August Weather26°C (80°F)122 mm (4.8 inches)73%very high
September Weather24°C (76°F)108 mm (4.2 inches)70%very high
October Weather19°C (66°F)119 mm (4.7 inches)73%high
November Weather11°C (52°F)71 mm (2.8 inches)85%moderate
December Weather9°C (49°F)156 mm (6.1 inches)88%moderate

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