Usulutan climate — normals and trends
Usulutan (El Salvador) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.0 °C and it receives 1,764 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is April (28.2 °C on average) and the coldest is October (26.3 °C). Rainfall peaks in September.
Usulutan averages 0 frost days, 253 hot days (≥ 30 °C) and 168 rainy days per year.
Usulutan has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.8 °C (on 12 April 2024) and the coldest 17.3 °C (on 6 December 1945).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
UsulutanUsulutan
- coords
- 13.34°, -88.44°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.0°C
Average daily high
30.8°C
Average daily low
24.2°C
Annual rainfall
1,764mm
Sunshine / day
11.0h
Mean relative humidity
77%
Average peak wind
12.3km/h
Seasonal range
1.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
253 d/yr
Rainy days (≥ 1 mm)
168 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.0 °C
Average feels-like low
28.3 °C
Average peak gust
27.9 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
21.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.69 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.8 °C
12 April 2024
Coldest day
17.3 °C
6 December 1945
Wettest day
160 mm
17 November 2024
Windiest day
34.6 km/h
28 July 1996
Strongest gust
74.9 km/h
28 July 1996
Hottest feels-like
42.0 °C
15 July 2024
Coldest feels-like
16.3 °C
6 December 1945
Sunniest day
12.2 h
29 May 1999
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 32.6 °C | +1.3 °C | 6 mm | +4 mm |
| Feb | 32.9 °C | +1.2 °C | 3 mm | +1 mm |
| Mar | 32.6 °C | +0.6 °C | 12 mm | +3 mm |
| Apr | 33.4 °C | +1.2 °C | 16 mm | -16 mm |
| May | 33.1 °C | +1.9 °C | 58 mm | -129 mm |
| Jun | 31.4 °C | +1.3 °C | 430 mm | +117 mm |
| Jul | 32.0 °C | +1.1 °C | 147 mm | -70 mm |
| Aug | 31.1 °C | +0.7 °C | 155 mm | -103 mm |
| Sep | 30.6 °C | +1.2 °C | 277 mm | -76 mm |
| Oct | 30.1 °C | +0.8 °C | 304 mm | -11 mm |
| Nov | 31.1 °C | +1.2 °C | 8 mm | -62 mm |
| Dec | 31.5 °C | +0.8 °C | 17 mm | +10 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Usulutan?
Usulutan has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.0 °C and it receives 1,764 mm of precipitation per year.
What is the hottest day ever recorded in Usulutan?
The hottest day measured in Usulutan between 1940 and 2025 was 12 April 2024, reaching 37.8 °C.
What is the coldest day in Usulutan?
The coldest day measured in Usulutan between 1940 and 2025 was 6 December 1945, at 17.3 °C.
Does it snow in Usulutan?
Almost never: Usulutan sees virtually no snow, with about 0 frost days per year.
Has the climate of Usulutan warmed?
Yes: Usulutan warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Usulutan?
The wettest day measured in Usulutan between 1940 and 2025 was 17 November 2024, with 160 mm of rain in 24 hours.
What was the windiest day in Usulutan?
The windiest day measured in Usulutan between 1940 and 2025 was 28 July 1996, with winds reaching 34.6 km/h.
What is the warmest month in Usulutan?
The warmest month in Usulutan is April (28.2 °C on average); the coldest is October (26.3 °C).
How much does it rain in Usulutan?
Usulutan receives on average 1,764 mm of precipitation per year, spread over about 168 rainy days.
Is it sunny in Usulutan?
Usulutan gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
Are there tropical nights in Usulutan?
Yes: Usulutan has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Usulutan?
In Usulutan, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 15 July 2024, and the lowest was 16.3 °C on 6 December 1945.
Compare Usulutan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Usulutan