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September Weather in Weir, United States

Last updated: June 24, 2025

In September, the average temperature in Weir, United States hovers around 23°C (74°F), creating a pleasant environment for outdoor activities. However, temperatures can vary significantly, with minimums dropping to 7°C (44°F) and maximums rising to 35°C (96°F). Expect 88 mm (3.5 in) of precipitation over about 7 days, and enjoy the average humidity of 64% that adds a touch of warmth to the atmosphere.

September Temperature in Weir

In September in Weir, the average temperature is 23°C (74°F). Maximum temperatures can reach 35°C (96°F), while minimum temperatures can drop as low as 7°C (44°F). This diverse temperature range makes Weir an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Weir, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Weir, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec363851576878817874604842
Data source: Temperature data for Weir 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 Weir

In Weir in September, the precipitation amount is 88 mm (3.5 in) over a span of 7 days.

September Precipitation Trends in Weir

The chart displays monthly precipitation patterns in Weir, 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 Weir, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec70631331302099098112881245344
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Weir

In Weir in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Weir

This chart illustrates the average monthly humidity levels in Weir, 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 Weir is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Weir

In Weir 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 Weir.

Maximum UV Index Levels in Weir for September

The chart shows the monthly maximum UV Index (UVI) for Weir 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 Weir typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Weir 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 Weir Compares to Other Months

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

This table compares monthly weather conditions in Weir, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)70 mm (2.8 inches)81%moderate
February Weather3°C (38°F)63 mm (2.5 inches)78%high
March Weather10°C (51°F)133 mm (5.2 inches)76%high
April Weather14°C (57°F)130 mm (5.1 inches)78%very high
May Weather20°C (68°F)209 mm (8.2 inches)83%very high
June Weather25°C (78°F)90 mm (3.5 inches)83%extreme
July Weather27°C (81°F)97 mm (3.8 inches)78%extreme
August Weather26°C (79°F)112 mm (4.4 inches)68%very high
September Weather23°C (74°F)88 mm (3.5 inches)64%very high
October Weather16°C (60°F)124 mm (4.9 inches)70%high
November Weather9°C (48°F)53 mm (2.1 inches)83%moderate
December Weather6°C (42°F)44 mm (1.7 inches)87%moderate

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