September weather forecast
Klaten, Indonesia

Departing from the peak dry season, September introduces a gradual climb in rainfall. Cloud cover starts to thicken, blocking out some sunshine hours, while temperatures remain relatively constant. Despite the increase in rainfall, relative humidity stays on the lower spectrum. September's wind speeds follow August's trend, ensuring a steady breeze in Klaten. Rainfall climbs marginally to 31mm (1.22"), hinting at the impending monsoon season.

Temperature

Klaten's warmest months, September and October, record an average high-temperature of 33.6°C (92.5°F).

Heat index

For September, the heat index is evaluated at an extremely hot 43°C (109.4°F). Forewarned: Heat cramps and heat exhaustion are anticipated. Ongoing physical activity increases the likelihood of heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

The least humid month is September, with an average relative humidity of 65%.

Rainfall

In September, in Klaten, the rain falls for 10.9 days. Throughout September, 31mm (1.22") of precipitation is accumulated. Throughout the year, there are 256 rainfall days, and 1649mm (64.92") of precipitation is accumulated.

Daylight

In Klaten, the average length of the day in September is 12h and 4min.
On the first day of the month, sunrise is at 05:38 and sunset at 17:36. On the last day of September, sunrise is at 05:22 and sunset at 17:32 WIB.

Sunshine

In Klaten, Indonesia, the average sunshine in September is 9.5h.

UV index

The months with the highest UV index in Klaten are February through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in September interprets into the following advice:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.