September Weather in Siwan, India

Last updated: August 23, 2025

In Siwan, India, the average temperature in September reaches a warm 29°C (85°F), with lows of 23°C (73°F) and highs soaring up to 36°C (98°F). Expect a significant precipitation of 250 mm (9.8 in) spread across 22 days, contributing to a notably high average humidity of 91%. Embrace the tropical climate!

September Temperature in Siwan

In September in Siwan, the average temperature is 29°C (85°F), with maximums reaching up to 36°C (98°F) and minimums dropping as low as 23°C (73°F). This warm climate makes Siwan an ideal destination for travelers seeking sunny days and pleasant evenings.

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

The chart illustrates September temperature patterns in Siwan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siwan, September typically has an average temperature of 29°C (85°F), with highs reaching up to 36°C (98°F) and lows dropping to around 23°C (73°F).

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

September Precipitation in Siwan

In Siwan in September, the total precipitation amount is 250 mm (9.8 in) over the course of 22 days.

September Precipitation Trends in Siwan

The chart displays monthly precipitation patterns in Siwan, 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 Siwan, September typically receives around 250 mm (9.8 inches) of precipitation spread over approximately 22 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 Siwan

In Siwan in September humidity is 91%. With an average temperature of 29°C (85°F), this humidity feels like stepping into a warm, heavy blanket, making travel uncomfortable and leaving you drenched in sweat within moments of stepping outside.

September Average Humidity in Siwan

This chart illustrates the average monthly humidity levels in Siwan, 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 Siwan is approximately 91%, 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 Siwan

In Siwan in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Siwan.

Maximum UV Index Levels in Siwan for September

The chart shows the monthly maximum UV Index (UVI) for Siwan 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 Siwan typically reaches 11, which falls under the extreme exposure category.

Data source: Siwan 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 Siwan Compares to Other Months

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

This table compares monthly weather conditions in Siwan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	15°C (59°F)	10 mm (0.4 inches)	65%	moderate
February Weather	19°C (66°F)	10 mm (0.4 inches)	55%	high
March Weather	25°C (77°F)	10 mm (0.4 inches)	39%	very high
April Weather	30°C (87°F)	14 mm (0.5 inches)	24%	very high
May Weather	31°C (89°F)	69 mm (2.7 inches)	36%	very high
June Weather	32°C (89°F)	183 mm (7.2 inches)	65%	very high
July Weather	30°C (86°F)	439 mm (17.3 inches)	90%	extreme
August Weather	30°C (86°F)	337 mm (13.3 inches)	91%	extreme
September Weather	29°C (85°F)	250 mm (9.8 inches)	91%	extreme
October Weather	27°C (81°F)	56 mm (2.2 inches)	86%	very high
November Weather	22°C (72°F)	0 mm (0.0 inches)	79%	high
December Weather	17°C (63°F)	21 mm (0.8 inches)	75%	moderate