Ilo climate — normals and trends
Ilo (Peru) has a cold desert climate (BWk) under the Köppen-Geiger classification. Its mean annual temperature is 17.4 °C and it receives 17 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 February (20.8 °C on average) and the coldest is August (14.6 °C). Rainfall peaks in February.
Ilo averages 0 frost days, 0 hot days (≥ 30 °C) and 4 rainy days per year.
Ilo has warmed by +0.5 °C between 1940 and 2025, or +0.06 °C per decade. This trend is statistically significant.
The hottest day of the period reached 25.6 °C (on 20 January 1998) and the coldest 10.2 °C (on 27 August 2007).
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
IloMoquegua Department
- coords
- -17.63°, -71.34°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.4°C
Average daily high
19.1°C
Average daily low
16.1°C
Annual rainfall
17mm
Sunshine / day
11.2h
Mean relative humidity
85%
Average peak wind
15.6km/h
Seasonal range
6.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
4 d/yr
Annual snowfall
0.0 cm
Average feels-like high
20.2 °C
Average feels-like low
16.2 °C
Average peak gust
27.2 km/h
Tropical nights (≥ 20 °C)
23 d/yr
Solar radiation
22.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.5 °C
since 1940
+0.1 °C per decade · r² = 0.07 · p = 0.011
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
25.6 °C
20 January 1998
Coldest day
10.2 °C
27 August 2007
Wettest day
26 mm
10 February 1942
Windiest day
29.5 km/h
19 July 2018
Strongest gust
45.7 km/h
19 July 2018
Hottest feels-like
29.4 °C
20 January 1983
Coldest feels-like
7.7 °C
27 August 2007
Sunniest day
12.9 h
3 December 2025
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 | 21.6 °C | -0.1 °C | 5 mm | +1 mm |
| Feb | 23.0 °C | +0.8 °C | 3 mm | -1 mm |
| Mar | 21.4 °C | -0.3 °C | 0 mm | -1 mm |
| Apr | 19.5 °C | -0.8 °C | 0 mm | -1 mm |
| May | 19.0 °C | +0.1 °C | 0 mm | -1 mm |
| Jun | 17.6 °C | +0.1 °C | 1 mm | -0 mm |
| Jul | 16.9 °C | +0.2 °C | 0 mm | -1 mm |
| Aug | 16.7 °C | +0.3 °C | 5 mm | +4 mm |
| Sep | 17.1 °C | +0.3 °C | 0 mm | -1 mm |
| Oct | 18.0 °C | +0.5 °C | 0 mm | -0 mm |
| Nov | 18.8 °C | 0.0 °C | 0 mm | -1 mm |
| Dec | 19.9 °C | -0.5 °C | 0 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 Ilo?
Ilo has a cold desert climate (Köppen BWk). Over 1940-2025, the average annual temperature is 17.4 °C and it receives 17 mm of precipitation per year.
What is the hottest day ever recorded in Ilo?
The hottest day measured in Ilo between 1940 and 2025 was 20 January 1998, reaching 25.6 °C.
What is the coldest day in Ilo?
The coldest day measured in Ilo between 1940 and 2025 was 27 August 2007, at 10.2 °C.
Does it snow in Ilo?
Almost never: Ilo sees virtually no snow, with about 0 frost days per year.
Has the climate of Ilo warmed?
Yes: Ilo warmed by +0.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ilo?
The wettest day measured in Ilo between 1940 and 2025 was 10 February 1942, with 26 mm of rain in 24 hours.
What was the windiest day in Ilo?
The windiest day measured in Ilo between 1940 and 2025 was 19 July 2018, with winds reaching 29.5 km/h.
What is the warmest month in Ilo?
The warmest month in Ilo is February (20.8 °C on average); the coldest is August (14.6 °C).
How much does it rain in Ilo?
Ilo receives on average 17 mm of precipitation per year, spread over about 4 rainy days.
Is it sunny in Ilo?
Ilo gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
Are there tropical nights in Ilo?
Yes: Ilo has on average 23 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ilo?
In Ilo, between 1940 and 2025, the highest apparent temperature reached 29.4 °C on 20 January 1983, and the lowest was 7.7 °C on 27 August 2007.
Compare Ilo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ilo