September Weather in Glasgow, United States

Last updated: June 24, 2025

In September, the average temperature in Glasgow, United States is a comfortable 15°C (59°F), with extremes ranging from a chilly -3°C (27°F) to a balmy 36°C (98°F). Expect some rain, as 54 mm (2.1 in) of precipitation usually falls over about 6 days. The air tends to be pleasantly humid, with an average humidity of 64%.

September Temperature in Glasgow

In September in Glasgow, the average temperature is 15°C (59°F). Maximums can reach 36°C (98°F), while minimums can drop to as low as -3°C (27°F). This wide range of temperatures means travelers should be prepared for both warm and chilly weather during their visit.

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 15°C (59°F), with highs reaching up to 36°C (98°F) and lows dropping to around -3°C (27°F).

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

September Precipitation in Glasgow

In Glasgow in September, the total precipitation amount is 54 mm (2.1 in) over the course of 6 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 54 mm (2.1 inches) of precipitation spread over approximately 6 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Glasgow

In Glasgow in September humidity is 64%. With an average temperature of 15°C (59°F), this humidity feels like a refreshing embrace, making traveling comfortable yet slightly sticky; perfect for leisurely strolls but perhaps a bit challenging for those sensitive to heat.

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 64%, 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 Glasgow

In Glasgow in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (18°F)	9 mm (0.4 inches)	88%	low
February Weather	-11°C (13°F)	24 mm (0.9 inches)	91%	moderate
March Weather	-1°C (30°F)	22 mm (0.9 inches)	84%	moderate
April Weather	5°C (42°F)	24 mm (0.9 inches)	71%	high
May Weather	13°C (56°F)	36 mm (1.4 inches)	74%	very high
June Weather	19°C (67°F)	57 mm (2.3 inches)	70%	very high
July Weather	23°C (75°F)	24 mm (0.9 inches)	76%	very high
August Weather	22°C (71°F)	34 mm (1.3 inches)	74%	very high
September Weather	15°C (59°F)	54 mm (2.1 inches)	64%	high
October Weather	6°C (43°F)	22 mm (0.9 inches)	69%	moderate
November Weather	-1°C (31°F)	24 mm (1.0 inches)	82%	moderate
December Weather	-6°C (21°F)	19 mm (0.7 inches)	91%	low