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September Weather in Glasgow, United States

Last updated: June 24, 2025

In Glasgow, United States, the average temperature in September is a delightful 23°C (73°F). However, be prepared for a range, as temperatures can dip to a cool 8°C (47°F) and soar up to a warm 36°C (98°F). Expect 129 mm (5.1 in) of precipitation over approximately 9 days, contributing to an average humidity of 71%. Perfect your packing strategy to embrace the beauty of the season!

September Temperature in Glasgow

In September in Glasgow, the average temperature is 23°C (73°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 8°C (47°F). It's an ideal time to visit for those who enjoy mild to warm weather, but be prepared for temperature fluctuations throughout the day.

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

The chart illustrates September temperature patterns in Glasgow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glasgow, September typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (98°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec384350586976807773624743
Data source: Temperature data for Glasgow 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 Glasgow

In Glasgow in September, the total precipitation amount is 129 mm (5.1 in) over the course of 9 days.

September Precipitation Trends in Glasgow

The chart displays monthly precipitation patterns in Glasgow, 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 Glasgow, September typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10218414515712316411712912914192145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glasgow

In Glasgow in September humidity is 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

September Average Humidity in Glasgow

This chart illustrates the average monthly humidity levels in Glasgow, 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 Glasgow is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glasgow

In Glasgow 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 Glasgow.

Maximum UV Index Levels in Glasgow for September

The chart shows the monthly maximum UV Index (UVI) for Glasgow 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 Glasgow typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
Data source: Glasgow 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 Glasgow Compares to Other Months

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

This table compares monthly weather conditions in Glasgow, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)102 mm (4.0 inches)87%moderate
February Weather6°C (43°F)184 mm (7.3 inches)86%high
March Weather10°C (51°F)145 mm (5.7 inches)86%high
April Weather14°C (58°F)157 mm (6.2 inches)82%very high
May Weather21°C (69°F)123 mm (4.8 inches)82%very high
June Weather24°C (76°F)164 mm (6.5 inches)83%extreme
July Weather26°C (80°F)117 mm (4.6 inches)80%extreme
August Weather25°C (78°F)129 mm (5.1 inches)74%very high
September Weather23°C (73°F)129 mm (5.1 inches)71%very high
October Weather17°C (62°F)141 mm (5.6 inches)78%high
November Weather8°C (47°F)92 mm (3.6 inches)88%moderate
December Weather6°C (44°F)145 mm (5.7 inches)88%moderate

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