September Weather in Gap, United States

Last updated: June 24, 2025

In Gap, United States, the average temperature during September is a comfortable 21°C (70°F). However, temperatures can fluctuate, with a minimum of 5°C (41°F) and soaring up to 33°C (92°F). Expect about 112 mm (4.4 in) of precipitation spread over 10 days, contributing to an average humidity of 75%. Prepare for a mix of pleasant warmth and refreshing rain!

September Temperature in Gap

In September in Gap, the average temperature is 21°C (70°F). The maximum can reach 33°C (92°F), while the minimum can dip as low as 5°C (41°F). This climate makes Gap an ideal destination for travelers looking to enjoy pleasant weather with a good range of temperatures.

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

The chart illustrates September temperature patterns in Gap, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gap, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Gap

In Gap in September, the total precipitation amount is 112 mm (4.4 in) over the course of 10 days.

September Precipitation Trends in Gap

The chart displays monthly precipitation patterns in Gap, 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 Gap, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Gap

In Gap in September, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

September Average Humidity in Gap

This chart illustrates the average monthly humidity levels in Gap, 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 Gap 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 Gap

In Gap in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Gap.

Maximum UV Index Levels in Gap for September

The chart shows the monthly maximum UV Index (UVI) for Gap 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 Gap typically reaches 8, which falls under the very high exposure category.

Data source: Gap 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 Gap Compares to Other Months

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

This table compares monthly weather conditions in Gap, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	65 mm (2.6 inches)	84%	moderate
February Weather	3°C (38°F)	106 mm (4.2 inches)	83%	moderate
March Weather	6°C (43°F)	105 mm (4.1 inches)	83%	high
April Weather	12°C (54°F)	102 mm (4.0 inches)	81%	very high
May Weather	17°C (64°F)	139 mm (5.5 inches)	78%	very high
June Weather	22°C (73°F)	119 mm (4.7 inches)	79%	very high
July Weather	25°C (78°F)	156 mm (6.1 inches)	74%	very high
August Weather	24°C (75°F)	160 mm (6.3 inches)	72%	very high
September Weather	21°C (70°F)	112 mm (4.4 inches)	75%	very high
October Weather	15°C (60°F)	100 mm (3.9 inches)	81%	high
November Weather	7°C (45°F)	90 mm (3.5 inches)	85%	moderate
December Weather	3°C (38°F)	101 mm (4.0 inches)	84%	low