September Weather in Semelhe, Portugal

Last updated: August 27, 2025

In September, the average temperature in Semelhe, Portugal is a pleasant 20°C (68°F). Expect a minimum of 8°C (46°F) on cooler days, while temperatures can peak at a sizzling 34°C (94°F). With an average precipitation of 44 mm (1.7 in) over 6 days, don't forget your umbrella! Additionally, the average humidity hovers around 71%, adding a touch of warmth to the atmosphere.

September Temperature in Semelhe

In September in Semelhe, the average temperature is 20°C (68°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 8°C (46°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while ensuring they are prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Semelhe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semelhe, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 8°C (46°F).

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

September Precipitation in Semelhe

In Semelhe in September, the total precipitation amount is 44 mm (1.7 in) spread over 6 days.

September Precipitation Trends in Semelhe

The chart displays monthly precipitation patterns in Semelhe, 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 Semelhe, September typically receives around 44 mm (1.7 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 Semelhe

In Semelhe in September, humidity is 71%. With an average temperature of 20°C (68°F), this humidity feels like a warm, moist embrace that can quickly lead to discomfort for travelers. The air clings to your skin, making even short walks feel more strenuous, while reaching for a refreshing drink becomes essential to stay hydrated.

September Average Humidity in Semelhe

This chart illustrates the average monthly humidity levels in Semelhe, 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 Semelhe is approximately 71%, 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 Semelhe

In Semelhe 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 Semelhe.

Maximum UV Index Levels in Semelhe for September

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

Data source: Semelhe 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 Semelhe Compares to Other Months

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

This table compares monthly weather conditions in Semelhe, 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 (47°F)	116 mm (4.5 inches)	87%	low
February Weather	11°C (51°F)	169 mm (6.7 inches)	81%	moderate
March Weather	12°C (53°F)	171 mm (6.7 inches)	78%	high
April Weather	14°C (57°F)	162 mm (6.4 inches)	79%	very high
May Weather	17°C (62°F)	95 mm (3.8 inches)	78%	very high
June Weather	18°C (65°F)	54 mm (2.1 inches)	71%	extreme
July Weather	21°C (70°F)	24 mm (1.0 inches)	63%	very high
August Weather	21°C (70°F)	24 mm (1.0 inches)	64%	very high
September Weather	20°C (68°F)	44 mm (1.7 inches)	71%	very high
October Weather	16°C (61°F)	143 mm (5.6 inches)	79%	high
November Weather	12°C (54°F)	189 mm (7.4 inches)	86%	moderate
December Weather	10°C (51°F)	218 mm (8.6 inches)	87%	low