The weather forecast for San Isidro this Monday, September 21, indicates that the maximum temperature will be 16°C and the minimum will be 10°C.
Additionally, according to the National Meteorological Service (SMN), winds of 24 km/h are expected, and average humidity will be 76%.
Weather forecast for San Isidro for the morning of September 21, 2026
The SMN report states that during the early hours of this Monday, September 21, weather will remain dry, humidity will be 76%, and moderate winds of 24 km/h from the west are expected.
Meanwhile, for mid-morning, no rainfall is forecast, humidity will be 45%, and there will be moderate winds of 33 km/h from the southwest.
Weather forecast for the afternoon/evening of September 21, 2026
According to the agency's forecast for San Isidro, no rainfall is expected this afternoon, with moderate winds of 36 km/h from the southwest.
Meanwhile, for tonight, no rainfall is forecast and there will be moderate winds of 28 km/h from the southwest.
What is the National Meteorological Service and how does it work
The National Meteorological Service (SMN) is the official agency responsible for collecting, analyzing, and disseminating meteorological information across the country. Its main function is to predict climate and atmospheric conditions, issue early warnings about dangerous meteorological phenomena, and provide weather information for various activities, such as aviation, agriculture, and navigation.
The SMN operates through a network of meteorological stations distributed throughout the country, in addition to using satellite imagery and numerical prediction models.
What is a meteorological alert in San Isidro
The agency itself refers to an alert as "the possible occurrence of a meteorological threat," which it issues with the aim of supporting decision-making across all sectors of the population. These are generally issued 24, 48, or 72 hours before the event. On the other hand, very short-term advisories (ACP) urge the population to take action quickly, as the phenomenon may occur just minutes after being issued.
An alert can be issued for situations involving rain or storms, or in the face of extreme temperatures or phenomena that deviate from normal conditions.
What is a yellow alert
These involve possible meteorological phenomena with the potential for damage and the risk of momentary disruption to daily activities, according to the SMN.
In the case of high temperatures, the yellow level indicates that they may be dangerous, especially for at-risk groups, such as children, people over 65, and those with chronic illnesses.
What is an orange alert
This warning indicates that meteorological phenomena dangerous to society, life, property, and the environment are expected. In this case, temperatures may be very dangerous, especially for at-risk groups.
What is a red alert
The agency's website warns of "exceptional meteorological phenomena with the potential to cause emergencies or disasters."
In this type of alert, temperatures are "very dangerous and may affect all people, including those in good health."
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