September weather forecast
Vallam, India

September, the last month of the rainy (monsoon) season in Vallam, is another hot month, with an average temperature fluctuating between 34.9°C (94.8°F) and 25.8°C (78.4°F).

Temperature

As August turns into September, the average high-temperatures rest at a hot 34.9°C (94.8°F), showing a minor variation from the prior month. September nights are marked by an average low-temperature of 25.8°C (78.4°F).

Heat index

During September, the heat index is calculated to be a blazing hot 46°C (114.8°F). Be cautious: Heat exhaustion along with heat cramps are predicted. Heatstroke is a possible consequence of continuous physical effort.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The average relative humidity in September is 63%.

Rainfall

In Vallam, India, in September, it is raining for 16.5 days, with typically 49mm (1.93") of accumulated precipitation. Throughout the year, there are 145 rainfall days, and 512mm (20.16") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 11min.
On the first day of September, sunrise is at 6:04 am and sunset at 6:23 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 6:04 pm IST.

Sunshine

In Vallam, the average sunshine in September is 8.8h.

UV index

In Vallam, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 7 in September transforms into this advice:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.