October weather forecast
Merizo, GU

October marks a decline in rainfall volume from the high figures witnessed the previous month. The reduced precipitation, coupled with a gradual drop in temperature, gives an indication of the forthcoming dry season. The transitional weather gets nurtured further by cyclical changes in daylight hours and sunshine duration. Although at the tail end of the monsoons, outdoor conditions remain pleasant with the decrease in rainfall intensity. The relatively calm wind adds to the inviting weather conditions.

Temperature

Upon the onset of October, Merizo witnesses an average high-temperature of a still warm 84.4°F (29.1°C), showing a close resemblance to the prior month. Nighttime temperatures in Merizo record an average of 82.6°F (28.1°C) throughout October.

Heat index

For October, the heat index is evaluated at a sweltering 95°F (35°C). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. 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. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

The months with the highest humidity are January, March through May, October through December, with an average relative humidity of 78%.

Rainfall

In Merizo, in October, it is raining for 28.7 days, with typically 8.46" (215mm) of accumulated precipitation. In Merizo, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

In Merizo, Guam, the average seawater temperature in October is 85.1°F (29.5°C).
Note: For swimming, diving, and various water activities, the temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In October, the average length of the day is 11h and 50min.
On the first day of October, sunrise is at 6:10 am and sunset at 6:11 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 5:54 pm ChST.

Sunshine

In October, the average sunshine in Merizo is 6.9h.

UV index

The months with the highest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 7 in October interprets into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert! The reflection of water and sand augments UV radiation intensity.