September weather forecast
Calcutta, Suriname

September weather in Calcutta witnesses the driest phase of the year with a significant reduction in rainfall to just 34mm (1.34"). The city basks in the prominence of the sun, ensuring optimal daylight conditions. Temperature highs and lows continue to be constant, allowing city dwellers and travelers to adapt quickly. Profuse sunshine enhances the city's radiant atmosphere, making it a perfect time for sightseeing and indulging in outdoor activities. Despite a lesser amount of cloud cover, a moderate gust of wind aids in breaking the monotony of the hot, sultry weather.

Temperature

Calcutta marks the onset of September with an average high-temperature of a still tropical 31.5°C (88.7°F), subtly divergent from August's 31°C (87.8°F). Throughout the September nights, Calcutta encounters a low-temperature of 24.6°C (76.3°F).

Heat index

September's mean heat index is appraised at a blistering 41°C (105.8°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

September and October, with an average relative humidity of 77%, are the least humid months.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.5 days and typically collects 34mm (1.34") of precipitation.

Daylight

In September, the average length of the day is 12h and 9min.
On the first day of September, sunrise is at 06:35 and sunset at 18:49. On the last day of the month, sunrise is at 06:30 and sunset at 18:34 -03.

Sunshine

With an average of 9.6h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index are February, March, June through November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 7 during September translates into the following guidance:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.