September weather forecast
San Marcos, Nicaragua

September in San Marcos experiences a slight dip in high temperatures to 30.2°C (86.4°F), while low temperatures maintain a steady 23.6°C (74.5°F), and relative humidity marginally rises to 82%. The weather exhibits continued rainfall indicating the persistence of the wet season. A tangible reduction in daylight duration accompanies the month, shortening the days. The city endures the lowest wind speed of the year, enhancing the calm tranquillity of the environment. Despite reduced sunshine days and a steady cloud cover percentage, the overall weather condition remains pleasantly serene.

Temperature

San Marcos's weather, upon September's arrival, documents an average high-temperature of a still hot 30.2°C (86.4°F), nearly identical to the prior month. September nights are marked by an average low-temperature of 23.6°C (74.5°F).

Heat index

In September, the heat index is appraised at a torrid 39°C (102.2°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In San Marcos, the average relative humidity in September is 82%.

Rainfall

In September, the rain falls for 27.5 days. Throughout September, 216mm (8.5") of precipitation is accumulated. In San Marcos, Nicaragua, during the entire year, the rain falls for 214.4 days and collects up to 1654mm (65.12") of precipitation.

Daylight

In San Marcos, the average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 05:34 and sunset at 17:54. On the last day of September, sunrise is at 05:33 and sunset at 17:35 CST.

Sunshine

In San Marcos, the average sunshine in September is 8.4h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in San Marcos. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the UV index of 7 transforms into the following advice:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.