September weather forecast
Cẩm Phả, Vietnam

September services as a bridge between the hot, rainy season and the gradually cooling climate in Cẩm Phả, Vietnam. The major climate shift is the drop in rainfall from 270mm (10.63") in August to 137mm (5.39") in September. Reduced precipitation and temperature fluctuation offer a respite from the preceding months' intense heat and humidity. The slow transition from summer to fall ensures comfortable weather and gives tourists a chance to enjoy less crowded attractions. Despite the declining rainfall, it's a wonderful month for the exploration of Cẩm Phả's natural beauty.

Temperature

September brings an average high-temperature of a moderately hot 29.8°C (85.6°F), showing a slight difference from August's 30.2°C (86.4°F). Cẩm Phả maintains a minor drop in temperature during September nights, with averages of 26.1°C (79°F).

Heat index

The heat index in September is computed to be a torrid 36°C (96.8°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Cẩm Phả, Vietnam, in September, during 18.3 rainfall days, 137mm (5.39") of precipitation is typically accumulated. In Cẩm Phả, during the entire year, the rain falls for 209.3 days and collects up to 1269mm (49.96") of precipitation.

Sea temperature

In Cẩm Phả, in September, the average water temperature is 28.9°C (84°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of September, sunrise is at 05:34 and sunset at 18:06. On the last day of the month, sunrise is at 05:41 and sunset at 17:39 +07.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 7 in September translates into these instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.