September Weather in Semnan, Iran

Last updated: August 23, 2025

In September, the average temperature in Semnan, Iran hovers around 25°C (77°F), making it a pleasant time to visit. Temperatures can vary, dipping to a minimum of 12°C (53°F) and soaring to a maximum of 37°C (99°F). With just 2 mm (0.1 in) of precipitation over 0 days, you can expect predominantly dry weather. The average humidity sits at a comfortable 33%, ensuring a refreshing experience in this vibrant locale.

September Temperature in Semnan

In September, in Semnan, the average temperature is 25°C (77°F). Maximum temperatures can reach 37°C (99°F), while minimums can drop to as low as 12°C (53°F). This makes Semnan an ideal destination for travelers seeking warm weather, but it's wise to pack for varying conditions.

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

The chart illustrates September temperature patterns in Semnan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semnan, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (53°F).

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

September Precipitation in Semnan

In Semnan in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Semnan

The chart displays monthly precipitation patterns in Semnan, 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 Semnan, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 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 Semnan

In Semnan in September humidity is 33%. With an average temperature of 25°C (77°F), this humidity feels like a comfortable and pleasant experience for traveling, making outdoor exploration enjoyable without feeling overly sticky or oppressive.

September Average Humidity in Semnan

This chart illustrates the average monthly humidity levels in Semnan, 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 Semnan is approximately 33%, 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 Semnan

In Semnan in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Semnan.

Maximum UV Index Levels in Semnan for September

The chart shows the monthly maximum UV Index (UVI) for Semnan 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 Semnan typically reaches 10, which falls under the very high exposure category.

Data source: Semnan 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 Semnan Compares to Other Months

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

This table compares monthly weather conditions in Semnan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	11 mm (0.4 inches)	63%	moderate
February Weather	6°C (44°F)	21 mm (0.8 inches)	62%	moderate
March Weather	12°C (53°F)	21 mm (0.8 inches)	63%	very high
April Weather	17°C (63°F)	17 mm (0.7 inches)	57%	very high
May Weather	22°C (72°F)	12 mm (0.5 inches)	57%	extreme
June Weather	29°C (84°F)	1 mm (0.0 inches)	47%	extreme
July Weather	31°C (88°F)	0 mm (0.0 inches)	34%	extreme
August Weather	29°C (84°F)	1 mm (0.0 inches)	28%	extreme
September Weather	25°C (77°F)	2 mm (0.1 inches)	33%	very high
October Weather	17°C (63°F)	8 mm (0.3 inches)	51%	high
November Weather	10°C (50°F)	19 mm (0.8 inches)	66%	moderate
December Weather	6°C (43°F)	11 mm (0.4 inches)	65%	moderate