September weather forecast
Rusayl, Oman

September marks the decline of the relentless summer characteristics as Rusayl cools down significantly to a high of 35.9°C (96.6°F). The month stands out due to no registered rainfall, highlighting the tail end of the arid summer season. The cloud cover becomes sparse, offering a brilliant view of the expansive sky. However, the decrease in daylight hours and higher recurrence of windy days point to the forthcoming mild winter conditions. With October on the horizon, the transformation towards cooler weather and diverse climatic conditions accelerates rapidly.

Temperature

The transition from August to September brings an average high-temperature of a still very hot 35.9°C (96.6°F), barely different from August's 36.8°C (98.2°F). In Rusayl, September nights witness a steady temperature drop to a warm 27.9°C (82.2°F).

Heat index

Throughout September, the heat index is computed to be a scorching 41°C (105.8°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', ties air temperature with relative humidity to produce the perceived temperature sensation. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In September, the average relative humidity is 45%.

Rainfall

The only month without rainfall is September.

Daylight

In September, the average length of the day is 12h and 17min.
On the first day of September, sunrise is at 05:49 and sunset at 18:25. On the last day of the month, sunrise is at 05:58 and sunset at 17:55 +04.

Sunshine

In Rusayl, the average sunshine in September is 11.8h.

UV index

The average daily maximum UV index in September in Rusayl is 8. A UV Index value of 8 to 10 symbolizes a very high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 8 transforms into these recommendations:
Ensure you're always protected. Unprotected skin can get damaged in moments. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.