September Weather in Nan, Thailand

Last updated: August 27, 2025

In Nan, Thailand, the average temperature in September is a warm 27°C (82°F). Expect minimums around 22°C (71°F) and highs reaching 35°C (95°F). The month brings 185 mm (7.3 in) of precipitation over approximately 22 days, contributing to an average humidity of a balmy 85%. Get ready for an invitingly humid atmosphere!

September Temperature in Nan

In September in Nan, the average temperature is 27°C (82°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 22°C (71°F). This makes it a great time to visit for warm weather activities and outdoor exploration.

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

The chart illustrates September temperature patterns in Nan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nan, September typically has an average temperature of 27°C (82°F), with highs reaching up to 35°C (95°F) and lows dropping to around 22°C (71°F).

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

September Precipitation in Nan

In Nan in September, the precipitation amount is 185 mm (7.3 in) distributed over 22 days.

September Precipitation Trends in Nan

The chart displays monthly precipitation patterns in Nan, 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 Nan, September typically receives around 185 mm (7.3 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 Nan

In Nan in September humidity is 85%. With an average temperature of 27°C (82°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit more challenging and encouraging travelers to seek shade and stay hydrated.

September Average Humidity in Nan

This chart illustrates the average monthly humidity levels in Nan, 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 Nan is approximately 85%, 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 Nan

In Nan in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Nan.

Maximum UV Index Levels in Nan for September

The chart shows the monthly maximum UV Index (UVI) for Nan 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 Nan typically reaches 13, which falls under the extreme exposure category.

Data source: Nan 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 Nan Compares to Other Months

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

This table compares monthly weather conditions in Nan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	25 mm (1.0 inches)	57%	very high
February Weather	24°C (76°F)	11 mm (0.4 inches)	53%	extreme
March Weather	28°C (82°F)	10 mm (0.4 inches)	45%	extreme
April Weather	29°C (84°F)	90 mm (3.5 inches)	39%	extreme
May Weather	29°C (85°F)	123 mm (4.9 inches)	66%	extreme
June Weather	28°C (83°F)	201 mm (7.9 inches)	79%	extreme
July Weather	28°C (82°F)	265 mm (10.4 inches)	90%	extreme
August Weather	27°C (81°F)	312 mm (12.3 inches)	92%	extreme
September Weather	27°C (82°F)	185 mm (7.3 inches)	85%	extreme
October Weather	27°C (81°F)	91 mm (3.6 inches)	72%	extreme
November Weather	26°C (79°F)	14 mm (0.5 inches)	64%	very high
December Weather	23°C (73°F)	15 mm (0.6 inches)	60%	very high