September weather forecast
Manado, Indonesia

In September, conditions evolve further in Manado, Indonesia, recording the highest average temperatures for the year with the thermometers reading 30.4°C (86.7°F). The dry conditions continue from August with the reduced rainfall at 69mm (2.72") falling over 19.5 days. This period sees the least number of rainy days and the lowest cloud coverage enhancing the city's daylight hours. The wind speed slows down, bringing about balanced weather for the month.

Temperature

An average high-temperature of a still tropical 30.4°C (86.7°F) marks September in Manado, exhibiting a close resemblance to the conditions in August. An average nighttime temperature of 24°C (75.2°F) is observed during September.

Heat index

The heat index value during September is appraised at a very hot 38°C (100.4°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. 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 exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The least humid month in Manado is September, with an average relative humidity of 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 19.5 days and accumulates 69mm (2.72") of precipitation.

Sea temperature

The month with the coldest seawater in Manado is September, with an average sea temperature of 28.6°C (83.5°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

In September, the average length of the day is 12h and 7min.
On the first day of September in Manado, sunrise is at 05:36 and sunset at 17:44. On the last day of the month, sunrise is at 05:27 and sunset at 17:33 WITA.

Sunshine

With an average of 9.3h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index in Manado are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: A maximum high UV index of 7 in September translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.