Bou Ismaïl climate — normals and trends
Bou Ismaïl (Algeria) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 18.2 °C and it receives 609 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 August (24.9 °C on average) and the coldest is January (13.1 °C). Rainfall peaks in December.
Bou Ismaïl averages 0 frost days, 2 hot days (≥ 30 °C) and 81 rainy days per year.
Bou Ismaïl has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.1 °C (on 18 July 2023) and the coldest 2.6 °C (on 26 January 2005).
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
Bou IsmaïlTipaza Province
- coords
- 36.64°, 2.69°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.2°C
Average daily high
19.6°C
Average daily low
16.9°C
Annual rainfall
609mm
Sunshine / day
10.8h
Mean relative humidity
79%
Average peak wind
23.7km/h
Seasonal range
11.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
81 d/yr
Annual snowfall
0.0 cm
Average feels-like high
19.8 °C
Average feels-like low
16.0 °C
Average peak gust
33.0 km/h
Tropical nights (≥ 20 °C)
114 d/yr
Solar radiation
17.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.40 · 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
38.1 °C
18 July 2023
Coldest day
2.6 °C
26 January 2005
Wettest day
114 mm
10 October 1984
Windiest day
75.6 km/h
10 January 1987
Strongest gust
112.7 km/h
10 January 1987
Hottest feels-like
40.3 °C
9 July 1968
Coldest feels-like
-4.3 °C
3 January 1941
Snowiest day
1.1 cm
26 January 2005
Sunniest day
14.0 h
1 June 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 | 16.2 °C | +1.7 °C | 110 mm | +15 mm |
| Feb | 15.8 °C | +1.2 °C | 72 mm | -3 mm |
| Mar | 17.4 °C | +1.8 °C | 34 mm | -27 mm |
| Apr | 18.9 °C | +1.9 °C | 31 mm | -24 mm |
| May | 20.7 °C | +1.4 °C | 54 mm | +18 mm |
| Jun | 25.2 °C | +2.8 °C | 0 mm | -8 mm |
| Jul | 26.9 °C | +1.7 °C | 6 mm | +4 mm |
| Aug | 27.3 °C | +1.1 °C | 0 mm | -4 mm |
| Sep | 25.8 °C | +1.2 °C | 49 mm | +26 mm |
| Oct | 23.1 °C | +1.4 °C | 12 mm | -49 mm |
| Nov | 19.4 °C | +1.1 °C | 60 mm | -29 mm |
| Dec | 16.4 °C | +0.8 °C | 99 mm | -1 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 Bou Ismaïl?
Bou Ismaïl has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 18.2 °C and it receives 609 mm of precipitation per year.
What is the hottest day ever recorded in Bou Ismaïl?
The hottest day measured in Bou Ismaïl between 1940 and 2025 was 18 July 2023, reaching 38.1 °C.
What is the coldest day in Bou Ismaïl?
The coldest day measured in Bou Ismaïl between 1940 and 2025 was 26 January 2005, at 2.6 °C.
Does it snow in Bou Ismaïl?
Almost never: Bou Ismaïl sees virtually no snow, with about 0 frost days per year.
Has the climate of Bou Ismaïl warmed?
Yes: Bou Ismaïl warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bou Ismaïl?
The wettest day measured in Bou Ismaïl between 1940 and 2025 was 10 October 1984, with 114 mm of rain in 24 hours.
What was the windiest day in Bou Ismaïl?
The windiest day measured in Bou Ismaïl between 1940 and 2025 was 10 January 1987, with winds reaching 75.6 km/h.
What is the warmest month in Bou Ismaïl?
The warmest month in Bou Ismaïl is August (24.9 °C on average); the coldest is January (13.1 °C).
How much does it rain in Bou Ismaïl?
Bou Ismaïl receives on average 609 mm of precipitation per year, spread over about 81 rainy days.
Is it sunny in Bou Ismaïl?
Bou Ismaïl gets on average 10.8 hours of sunshine per day, roughly 3,942 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bou Ismaïl?
The heaviest 24-hour snowfall measured in Bou Ismaïl between 1940 and 2025 was 26 January 2005, with 1.1 cm.
Are there tropical nights in Bou Ismaïl?
Yes: Bou Ismaïl has on average 114 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bou Ismaïl?
In Bou Ismaïl, between 1940 and 2025, the highest apparent temperature reached 40.3 °C on 9 July 1968, and the lowest was -4.3 °C on 3 January 1941.
Compare Bou Ismaïl with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bou Ismaïl