This report describes the typical weather at the El Salvador International Airport (San Salvador, El Salvador) weather station over the course of an average year. It is based on the historical records from 1996 to 2012. Earlier records are either unavailable or unreliable.
San Salvador has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (38%), forests (29%), croplands (24%), and grasslands (5%).
Over the course of a year, the temperature typically varies from 70°F to 93°F and is rarely below 67°F or above 96°F.
The warm season lasts from January 29 to May 10 with an average daily high temperature above 92°F. The hottest day of the year is March 14, with an average high of 93°F and low of 73°F.
The cold season lasts from August 26 to October 24 with an average daily high temperature below 88°F. The coldest day of the year is January 15, with an average low of 70°F and high of 91°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 11:21 hours of daylight; the longest day is June 20 with 12:55 hours of daylight.
The earliest sunrise is at 5:28am on June 3 and the latest sunset is at 6:28pm on July 7. The latest sunrise is at 6:24am on January 25 and the earliest sunset is at 5:26pm on November 19.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 41% (partly cloudy) to 81% (mostly cloudy). The sky is cloudiest on September 20 and clearest on February 20. The clearer part of the year begins around November 12. The cloudier part of the year begins around May 1.
On February 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 30% of the time, and overcast or mostly cloudy 7% of the time.
On September 20, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 62% of the time, and clear or mostly clear 15% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around September 10, occurring in 76% of days. Precipitation is least likely around January 25, occurring in 2% of days.
Over the entire year, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 65% of those days with precipitation. They are most likely around July 31, when it is observed during 57% of all days.
Moderate rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around September 21, when it is observed during 11% of all days.
Light rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around September 22, when it is observed during 9% of all days.
During the warm season, which lasts from January 29 to May 10, there is a 14% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (51% of days with precipitation have at worst thunderstorms), light rain (18%), moderate rain (16%), and drizzle (13%).
During the cold season, which lasts from August 26 to October 24, there is a 70% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (64% of days with precipitation have at worst thunderstorms), moderate rain (14%), light rain (11%), and heavy rain (7%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 36% (comfortable) to 98% (very humid) over the course of the year, rarely dropping below 24% (dry) and reaching as high as 100% (very humid).
The air is driest around February 3, at which time the relative humidity drops below 43% (comfortable) three days out of four; it is most humid around September 20, exceeding 98% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 59°F (comfortable) to 77°F (oppressive) and is rarely below 52°F (very comfortable) or above 79°F (oppressive).
Over the course of the year typical wind speeds vary from 0 mph to 12 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around January 9, at which time the average daily maximum wind speed is 12 mph (moderate breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around September 16, at which time the average daily maximum wind speed is 9 mph (gentle breeze).