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La Unión Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit La Unión.
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10-day forecastForecast
Climate overview of La Unión
La Unión, in El Salvador's La Unión Department, maintains relatively stable very warm temperatures throughout the year. The area experiences heavy rainfall spread across the seasons, with particularly intense downpours during the wet months. This Pacific port city sits on the Gulf of Fonseca, where ferry connections to Nicaragua and Honduras make it a key transit point for regional travelers. Now, let’s break down all the climate details for a clearer picture.
La Unión Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in La Unión - and find the best time to visit.
Monthly Temperature in La Unión
The temperature in La Unión remains steady throughout the year, providing a consistently very warm climate. Average daytime temperatures reach a very warm 33°C (91°F) in April. In October, the coolest month of the year, temperatures drop to a very warm 31°C (88°F).
At night, temperatures range from around 26°C (79°F) in April to 24°C (75°F) in October.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in La Unión
La Unión has a relatively rainy climate with high precipitation levels, averaging 1695 mm (67 in) of rainfall annually. La Unión can be quite wet during September, receiving approximately 353 mm (14 in) of precipitation over 27 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 1.4 mm (0.1 in) of precipitation spread across 2 rainy days. For more details, please visit our La Unión Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Humidity in La Unión by Month
The relative humidity is high throughout the year in La Unión.
The city experiences its highest humidity in September, reaching 80%. In February, the humidity drops to its lowest level at 57%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: San Miguel, El Salvador (39 KM, 24 Miles).
Best Time to Visit La Unión
For comfortable weather, consider visiting La Unión in January and December. Conditions are usually least favourable in May, June, July, August, September and October.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very good
Feb
good
Mar
good
Apr
mixed
May
very wet
Jun
very wet
Jul
wet
Aug
very wet
Sep
very wet
Oct
very wet
Nov
good
Dec
very good
- Best overall: January and December
- Warmest weather: January, February, March, April, May, June, July, August and December
- Fewest rainy days: January, February and March
- Wettest months: August, September and October, when rainfall is highest.
- Seasonal pattern: Distinct dry (December to April) and wet (August to October) seasons
Frequently asked questions about the climate in La Unión
What is the best time to visit La Unión?
January and December typically offer the most optimal weather in La Unión. In contrast, May, June, July, August, September and October tend to have less optimal conditions. La Unión has distinct dry (December to April) and wet (August to October) seasons.
What temperatures can I expect in La Unión?
Daytime highs range from 31°C (88°F) in October to 33°C (91°F) in April. Nighttime lows range from 24°C (75°F) to 26°C (79°F). Temperatures stay relatively stable year-round.
How much rain does La Unión get?
Annual rainfall is around 1695 mm (67 in). September is the wettest month with 353 mm (14 in), while January is the driest with 1.4 mm (0.1 in).
La Unión 3-Day Forecast
La Unión on the map
La Unión is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
San Miguel
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