September weather forecast
Lao Cai, Vietnam

The arrival of September in Lao Cai, Vietnam, brings a notable drop in rainfall from the preceding August and the weather pattern begins to shift towards drier conditions. It strikingly receives just over a third of August's rainfall, recording 69mm (2.72") over 20.4 days. Temperature measurements, on the other hand, show only slight changes, upholding the warmth of the tropical region. Sunshine hours begin to rise from the August readings, suggesting a clearer sky in the offing. Progressing into October, there's a further reduction in rainfall and a steady drop in temperature, marking the onset of the cooler period.

Temperature

September in Lao Cai welcomes an average high-temperature of a still hot 30°C (86°F), not much different from the preceding month. During the month of September, Lao Cai's nighttime temperature lowers to an average of 18.7°C (65.7°F).

Heat index

The heat index value for September is estimated at a sweltering 37°C (98.6°F). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Lao Cai, during September, the rain falls for 20.4 days and regularly aggregates up to 69mm (2.72") of precipitation. In Lao Cai, during the entire year, the rain falls for 188.3 days and collects up to 770mm (30.31") of precipitation.

Daylight

In September, the average length of the day is 12h and 17min.
On the first day of the month, sunrise is at 05:46 and sunset at 18:20. On the last day of September, in Lao Cai, sunrise is at 05:54 and sunset at 17:52 +07.

Sunshine

In Lao Cai, Vietnam, the average sunshine in September is 10.2h.

UV index

March through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high daily UV index of 6 during September translates into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Boost your sun resistance with garments that are densely woven yet spacious.