September weather forecast
Vanimo, Papua New Guinea

September rings in with slight variations in temperature, while the rainfall observes a decrease compared to August. Precipitation reduces to a low point again, similar to May levels. The sun shines for a nearly constant time, restricting sudden changes in temperature. However, despite diminished rainfall, the ocean remains warm, inviting for water-based activities. Natural scenery captures its best form during this period due to the generous sunshine.

Temperature

The start of September is marked by an average high temperature of a still moderately hot 29.1°C (84.4°F), showing little divergence from August. Vanimo observes an average low-temperature of 24.7°C (76.5°F) during the slightly cooler nights of September.

Heat index

September's heat index is computed to be a fiery hot 35°C (95°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
The standards for the heat index are set for locations in shade and under light breezes. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. 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 quite important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. 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. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

September and October, with an average relative humidity of 79%, are the least humid months.

Rainfall

September is the month with the least rainfall in Vanimo. Rain falls for 19.9 days and accumulates 61mm (2.4") of precipitation.

Sea temperature

In September, the average sea temperature is 29.3°C (84.7°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

In Vanimo, the average length of the day in September is 12h and 6min.
On the first day of September, sunrise is at 06:32 and sunset at 18:36. On the last day of the month, sunrise is at 06:20 and sunset at 18:28 +10.

Sunshine

In Vanimo, the average sunshine in September is 8.5h.

UV index

The months with the highest UV index are February through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be mindful! Sand and water reflections can up the Sun's UV exposure.