La Unión department Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in La Unión department, El Salvador in September.

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La Unión

Are you planning a trip a to La Unión department, El Salvador in September and wondering what kind of weather to expect? This page has all the details you need.

What to Expect in La Unión department in September

La Unión department, El Salvador is a region in El Salvador. September in La Unión department generally has very warm temperatures, with heavy precipitation.

Temperatures

You can expect very warm maximum daytime temperatures of around 31°C (88°F) and nighttime temperatures around 25°C (77°F) in La Unión. The temperatures mentioned for both day and night are typical averages. However some days might get even hotter. It's best to stay prepared by wearing cloths suitable for the warmth.

For specific regional insights in La Unión department, El Salvador, refer to the map provided below.

Precipitation

September is a very rainy month with an average rainfall of around 353 mm (14 in) in La Unión. Looking at the climate data spanning the last 30 years, this month sees the heaviest rainfall of the year in La Unión.

Explore La Unión department by month

Pick a month to see the average temperature, rainfall and sunshine in La Unión department — and find the best time to visit. (based on La Unión)

January32°C (90°F) February33°C (91°F) March33°C (91°F) April33°C (91°F) May33°C (91°F) June32°C (90°F) This monthJuly33°C (91°F) August33°C (91°F) September31°C (88°F) October31°C (88°F) November32°C (90°F) December32°C (90°F)
Best Time to Visit La Unión department →

Best Places to Visit in La Unión department in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across La Unión department.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in La Unión department

What is the weather like in September for the most popular destinonation in La Unión department, El Salvador?

La Unión

In September La Unión generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

« August
September
October »
August
September
October
Max temperature
33°C (91°F)
31°C (88°F)
31°C (88°F)
Min temperature
26°C (79°F)
25°C (77°F)
25°C (77°F)
Monthly rainfall
235 mm (9.3 in)
353 mm (14 in)
317 mm (12 in)
Monthly rainy days
21 days
27 days
22 days
Weather conditions
poor
poor
poor
Climate in La Unión →

Is your destination not in the list? Have a look at all destinations in La Unión department, in El Salvador.

In our records: El Salvador September extremes

Notable September records observed across cities in El Salvador in our climate database (1995 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • From our sources, the wettest September day in El Salvador brought 298 mm (12 in) in Acajutla on September 1, 2005.

La Unión department weather in September: frequently asked questions

What is the weather like in La Unión department, El Salvador in September?

La Unión department, El Salvador typically experiences poor weather in September, part of the season. Daytime highs in La Unión average around 31°C (88°F), and temperatures drop to about 25°C (77°F) at night.

What is the average temperature in La Unión department, El Salvador in September?

Daytime temperatures in La Unión peak at roughly 31°C (88°F) in September, dropping to about 25°C (77°F) overnight.

Does La Unión department, El Salvador get a lot of rain in September?

Expect plenty of rainfall. La Unión records an average of 353 mm (14 in) in September, putting it among the wetter months for La Unión department, El Salvador.

Is September a Good Time to Visit La Unión department, El Salvador?

In our view, September might not be the best time to travel to La Unión department, El Salvador with often poor weather in La Unión.

On average, the best time to visit La Unión department, El Salvador is in January and December with generally pleasant weather in La Unión. The weather in May, June, July, August, September and October, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in La Unión department.

Weather and climate has detailed information for every country in the world. Are you going to El Salvador? Get detailed historical weather averages for many cities in El Salvador.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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