September weather forecastSienna, Philippines
September
Weather in September
September, the first month of the autumn in Sienna, is also a hot month, with an average temperature ranging between max 30.5°C (86.9°F) and min 24.8°C (76.6°F).Temperature
The arrival of September coincides with an average high-temperature of a still hot 30.5°C (86.9°F), indicating a minimal shift from August's 30.3°C (86.5°F). Throughout September, Sienna encounters an average temperature drop to a moderately hot 24.8°C (76.6°F).Heat index
During September, the heat index is appraised at a blisteringly hot 40°C (104°F). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.Always consider that heat index estimations are for light winds and places in the shade. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.
Humidity
The months with the highest humidity in Sienna are August and September, with an average relative humidity of 81%.Rainfall
In Sienna, during September, the rain falls for 21 days and regularly aggregates up to 128mm (5.04") of precipitation. Throughout the year, there are 185 rainfall days, and 830mm (32.68") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 13min.On the first day of September in Sienna, sunrise is at 5:43 am and sunset at 6:08 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 5:46 pm PST.
Sunshine
In Sienna, the average sunshine in September is 8.4h.UV index
February through December, with an average maximum UV index of 7, are months with the highest UV index in Sienna. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 7 during September morphs into the following directions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sienna, Philippines
- Average high temperature in September: 30.5°C
The warmest month (with the highest average high temperature) is May (33.4°C).
The month with the lowest average high temperature is January (28.3°C).
- Average low temperature in September: 24.8°C
The month with the highest average low temperature is May (26.4°C).
The coldest month (with the lowest average low temperature) is January (22.9°C).
Average pressure in September
Sienna, Philippines
- Average pressure in September: 1008.2mbar
The month with the highest atmospheric pressure is February (1013.4mbar).
The month with the lowest atmospheric pressure is August (1007.6mbar).
Average wind speed in September
Sienna, Philippines
- Average wind speed in September: 8.1km/h
The windiest month (with the highest average wind speed) is January (11.4km/h).
The calmest month (with the lowest average wind speed) is May (7.5km/h).
Average humidity in September
Sienna, Philippines
- Average humidity in September: 81%
The months with the highest relative humidity are August and September (81%).
The month with the lowest relative humidity is April (70%).
Average rainfall in September
Sienna, Philippines
- Average rainfall in September: 128mm
The wettest month (with the highest rainfall) is July (163mm).
The driest month (with the least rainfall) is February (11mm).
Average rainfall days in September
Sienna, Philippines
- Average rainfall days in September: 21 days
The month with the highest number of rainy days is July (23.4 days).
The month with the least rainy days is February (7 days).
Average daylight in September /
Average sunshine in September
Sienna, Philippines
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 18min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is April (Average sunshine: 11h and 18min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in September
Sienna, Philippines
- Average sunshine days in September: 7.8 days
The month with the most sunshine days is March (16.9 days).
The month with the least sunshine days is July (7 days).
Average UV index in September
Sienna, Philippines
- Average UV index in September: 7
The months with the highest UV index are February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The month with the lowest UV index is January (UV index 6).
Average cloud cover in September
Sienna, Philippines
- Average cloud cover in September: 44
The month with the most cloud cover is August (Cloud cover 51).
The month with the least cloud cover is April (Cloud cover 25).
Average visibility in September
Sienna, Philippines
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, May, June and December (10km).
The months with the lowest visibility are January, July, August, September, October and November (9km).
