Merca climate — normals and trends
Merca (Somalia) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 26.3 °C and it receives 503 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 (27.8 °C on average) and the coldest is August (24.9 °C). Rainfall peaks in May.
Merca averages 0 frost days, 97 hot days (≥ 30 °C) and 139 rainy days per year.
Merca has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.9 °C (on 20 March 1941) and the coldest 20.8 °C (on 19 August 1984).
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
MercaLower Shabeelle
- coords
- 1.72°, 44.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.3°C
Average daily high
29.0°C
Average daily low
24.5°C
Annual rainfall
503mm
Sunshine / day
11.7h
Mean relative humidity
78%
Average peak wind
23.5km/h
Seasonal range
2.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
97 d/yr
Rainy days (≥ 1 mm)
139 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.1 °C
Average feels-like low
27.0 °C
Average peak gust
42.1 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
22.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °C
since 1940
+0.1 °C per decade · r² = 0.62 · 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
33.9 °C
20 March 1941
Coldest day
20.8 °C
19 August 1984
Wettest day
125 mm
4 July 1995
Windiest day
39.2 km/h
25 July 1942
Strongest gust
66.2 km/h
8 August 1955
Hottest feels-like
40.1 °C
21 April 2023
Coldest feels-like
21.5 °C
4 January 1949
Sunniest day
12.0 h
6 April 1940
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 | 28.9 °C | -1.0 °C | 1 mm | -5 mm |
| Feb | 29.0 °C | -1.0 °C | 1 mm | -1 mm |
| Mar | 30.0 °C | -0.3 °C | 24 mm | +8 mm |
| Apr | 30.9 °C | +0.4 °C | 54 mm | -19 mm |
| May | 30.0 °C | +0.8 °C | 64 mm | -31 mm |
| Jun | 28.6 °C | +0.6 °C | 56 mm | -1 mm |
| Jul | 27.9 °C | +0.8 °C | 36 mm | -19 mm |
| Aug | 27.7 °C | +0.5 °C | 32 mm | -9 mm |
| Sep | 28.2 °C | +0.3 °C | 25 mm | -4 mm |
| Oct | 28.8 °C | +0.1 °C | 11 mm | -30 mm |
| Nov | 29.3 °C | +0.1 °C | 18 mm | -43 mm |
| Dec | 29.5 °C | -0.2 °C | 7 mm | -23 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 Merca?
Merca has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 503 mm of precipitation per year.
What is the hottest day ever recorded in Merca?
The hottest day measured in Merca between 1940 and 2025 was 20 March 1941, reaching 33.9 °C.
What is the coldest day in Merca?
The coldest day measured in Merca between 1940 and 2025 was 19 August 1984, at 20.8 °C.
Does it snow in Merca?
Almost never: Merca sees virtually no snow, with about 0 frost days per year.
Has the climate of Merca warmed?
Yes: Merca warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Merca?
The wettest day measured in Merca between 1940 and 2025 was 4 July 1995, with 125 mm of rain in 24 hours.
What was the windiest day in Merca?
The windiest day measured in Merca between 1940 and 2025 was 25 July 1942, with winds reaching 39.2 km/h.
What is the warmest month in Merca?
The warmest month in Merca is April (27.8 °C on average); the coldest is August (24.9 °C).
How much does it rain in Merca?
Merca receives on average 503 mm of precipitation per year, spread over about 139 rainy days.
Is it sunny in Merca?
Merca gets on average 11.7 hours of sunshine per day, roughly 4,271 hours per year over 1940-2025.
Are there tropical nights in Merca?
Yes: Merca has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Merca?
In Merca, between 1940 and 2025, the highest apparent temperature reached 40.1 °C on 21 April 2023, and the lowest was 21.5 °C on 4 January 1949.
Compare Merca with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Merca