September weather forecast
Nan, Thailand

As September rolls in, the weather begins to transition once again in Nan. The first cues of autumn are subtle, seen in the less crowded streets and cooler evenings. The city morphs sunset after sunset, leaving behind the lush monsoon months. Noticeably, September rainfall measures total 204mm (8.03"), a significant decline from August's record, and this downward trend marks the start of the harvest season. September culminates in the enchanting balance between receding rains and the incoming dry spell.

Temperature

September's presence marks an average high-temperature of a still tropical 32.7°C (90.9°F), subtly varied from August's 32.2°C (90°F). Nan's average low-temperature during September nights is observed to be a warm 23.3°C (73.9°F).

Heat index

During September, the heat index is estimated at a burning hot 49°C (120.2°F). Remain cautious: Heat cramps along with heat exhaustion are foreseeable. Ongoing activity may precipitate heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The months with the highest humidity in Nan, Thailand, are August and September, with an average relative humidity of 84%.

Rainfall

In September, the rain falls for 18 days. Throughout September, 204mm (8.03") of precipitation is accumulated. In Nan, during the entire year, the rain falls for 124 days and collects up to 1234mm (48.58") of precipitation.

Daylight

In Nan, Thailand, the average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:31. On the last day of September, sunrise is at 06:07 and sunset at 18:06 +07.

Sunshine

In Nan, the average sunshine in September is 6h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 12 in September interprets into the following recommendations:
Enforce every vital precaution. Those with light skin could endure burns in a matter of minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise.