September weather forecast
Bengaluru, India

September marks the retreating monsoon with rainfall levels classically descending. The weather moves back from the monsoon peak while maintaining a comfortable coolness during evenings. The decline in rainfall is gradual throughout the month, yet Bengaluru's ambiance remains vibrant. It's a month of transition, with the city shifting from the rain-cooled days of monsoon to the mild warmth of the post-monsoon period.

Temperature

The advent of September brings an average high-temperature of a still warm 28.3°C (82.9°F), almost identical to the preceding month. Throughout September, Bengaluru's nights cool down to an average of 19.7°C (67.5°F).

Heat index

Throughout September, the heat index is calculated to be a hot 32°C (89.6°F). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', measures the perceived warmth when incorporating the humidity present in the air. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.

Humidity

In September, the average relative humidity in Bengaluru is 76%.

Rainfall

September is the month with the most rainfall. Rain falls for 10.3 days and accumulates 241mm (9.49") of precipitation.

Daylight

In September, the average length of the day is 12h and 12min.
On the first day of September, sunrise is at 6:08 am and sunset at 6:30 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 6:10 pm IST.

Sunshine

The average sunshine in September is 4.8h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: An average UV index of 12 in September transforms into this advice:
Employ all critical precautions. Guarding against sun damage is essential. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Ward off sunburn by liberally using sunscreen with 30 SPF or more. This also diminishes the Sun's damaging radiation effects on your health.