September weather forecast
Sydney, FL

September, the first month of the autumn in Sydney, is also a hot month, with temperature in the range of an average low of 73.9°F (23.3°C) and an average high of 88.3°F (31.3°C).

Temperature

Sydney's transition from August to September introduces an average high-temperature of a still hot 88.3°F (31.3°C), marking an insignificant variation from the 90.1°F (32.3°C). September's average low-temperature reading in Sydney settles at a moderately hot 73.9°F (23.3°C).

Heat index

The heat index for September is estimated at a blistering 105.8°F (41°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important 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.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

With an average relative humidity of 78%, September is the most humid month.

Rainfall

In Sydney, in September, it is raining for 23 days, with typically 4.45" (113mm) of accumulated precipitation. Throughout the year, in Sydney, there are 192.2 rainfall days, and 37.91" (963mm) of precipitation is accumulated.

Daylight

The average length of the day in September in Sydney is 12h and 19min.
On the first day of September, sunrise is at 7:07 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:15 pm EDT.

Sunshine

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

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: An average UV index of 7 in September transforms into this advice:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.