September Weather in Glasgow, United States

Last updated: June 24, 2025

In September, the average temperature in Glasgow, United States is a comfortable 20°C (69°F), perfect for enjoying the outdoors! However, be prepared for variations, as temperatures can dip as low as 3°C (37°F) or soar up to 34°C (94°F). With an average precipitation of 99 mm (3.9 in) spread over 10 days, it’s wise to carry an umbrella. Don't forget, the average humidity during this month is 75%, contributing to a tropical feel in the air.

September Temperature in Glasgow

In September, in Glasgow, the average temperature is 20°C (69°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 3°C (37°F). It's advisable to pack a mix of light clothing for the warm days and warmer layers for the cooler evenings.

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 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (37°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 99 mm (3.9 in) spread over a period of 10 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 99 mm (3.9 inches) of precipitation spread over approximately 10 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 75%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel a bit muggy and requiring frequent hydration breaks to stay comfortable while exploring.

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 75%, 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 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.

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	2°C (35°F)	70 mm (2.7 inches)	84%	moderate
February Weather	4°C (40°F)	109 mm (4.3 inches)	84%	high
March Weather	7°C (46°F)	78 mm (3.1 inches)	84%	very high
April Weather	13°C (55°F)	124 mm (4.9 inches)	82%	very high
May Weather	18°C (64°F)	129 mm (5.1 inches)	82%	very high
June Weather	21°C (71°F)	98 mm (3.9 inches)	83%	extreme
July Weather	24°C (76°F)	58 mm (2.3 inches)	79%	very high
August Weather	23°C (74°F)	103 mm (4.0 inches)	77%	very high
September Weather	20°C (69°F)	99 mm (3.9 inches)	75%	very high
October Weather	15°C (59°F)	113 mm (4.4 inches)	81%	high
November Weather	6°C (44°F)	80 mm (3.2 inches)	87%	moderate
December Weather	4°C (39°F)	97 mm (3.8 inches)	85%	moderate