Buin climate — normals and trends
Buin (Chile) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 15.0 °C and it receives 536 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 January (21.7 °C on average) and the coldest is July (8.1 °C). Rainfall peaks in June.
Buin averages 20 frost days, 26 hot days (≥ 30 °C) and 52 rainy days per year.
The mean temperature of Buin has changed by -0.4 °C between 1940 and 2025, or -0.05 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.5 °C (on 12 January 1941) and the coldest -10.6 °C (on 18 June 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
BuinSantiago Metropolitan
- coords
- -33.73°, -70.74°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.0°C
Average daily high
21.8°C
Average daily low
8.6°C
Annual rainfall
536mm
Sunshine / day
10.7h
Mean relative humidity
59%
Average peak wind
9.2km/h
Seasonal range
13.6°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
52 d/yr
Annual snowfall
2.2 cm
Average feels-like high
21.6 °C
Average feels-like low
6.5 °C
Average peak gust
27.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
20.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
-0.4 °C
since 1940
-0.1 °C per decade · r² = 0.05 · p = 0.032
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
38.5 °C
12 January 1941
Coldest day
-10.6 °C
18 June 1945
Wettest day
121 mm
3 June 2002
Windiest day
21.1 km/h
10 November 1947
Strongest gust
87.1 km/h
11 June 1940
Hottest feels-like
37.4 °C
2 February 1973
Coldest feels-like
-15.3 °C
18 June 1945
Snowiest day
9.0 cm
15 July 2017
Sunniest day
14.2 h
16 December 2022
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 | 30.6 °C | +1.9 °C | 0 mm | -4 mm |
| Feb | 30.8 °C | +2.5 °C | 0 mm | -4 mm |
| Mar | 27.3 °C | +0.9 °C | 9 mm | +4 mm |
| Apr | 22.9 °C | +0.4 °C | 6 mm | -17 mm |
| May | 19.3 °C | +0.9 °C | 71 mm | -0 mm |
| Jun | 15.2 °C | 0.0 °C | 79 mm | -42 mm |
| Jul | 17.4 °C | +2.5 °C | 26 mm | -82 mm |
| Aug | 16.5 °C | +0.2 °C | 146 mm | +61 mm |
| Sep | 20.0 °C | +1.8 °C | 59 mm | -1 mm |
| Oct | 23.4 °C | +2.5 °C | 22 mm | -13 mm |
| Nov | 25.3 °C | +0.8 °C | 4 mm | -10 mm |
| Dec | 28.4 °C | +1.1 °C | 11 mm | +5 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 Buin?
Buin has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 15.0 °C and it receives 536 mm of precipitation per year.
What is the hottest day ever recorded in Buin?
The hottest day measured in Buin between 1940 and 2025 was 12 January 1941, reaching 38.5 °C.
What is the coldest day in Buin?
The coldest day measured in Buin between 1940 and 2025 was 18 June 1945, at -10.6 °C.
Does it snow in Buin?
Yes. Buin gets on average 2.2 cm of snow per year and has around 20 frost days.
Has the climate of Buin warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Buin.
What is the wettest day in Buin?
The wettest day measured in Buin between 1940 and 2025 was 3 June 2002, with 121 mm of rain in 24 hours.
What was the windiest day in Buin?
The windiest day measured in Buin between 1940 and 2025 was 10 November 1947, with winds reaching 21.1 km/h.
What is the warmest month in Buin?
The warmest month in Buin is January (21.7 °C on average); the coldest is July (8.1 °C).
How much does it rain in Buin?
Buin receives on average 536 mm of precipitation per year, spread over about 52 rainy days.
Is it sunny in Buin?
Buin gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Buin?
The heaviest 24-hour snowfall measured in Buin between 1940 and 2025 was 15 July 2017, with 9.0 cm.
Are there tropical nights in Buin?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Buin.
What was the most extreme apparent temperature in Buin?
In Buin, between 1940 and 2025, the highest apparent temperature reached 37.4 °C on 2 February 1973, and the lowest was -15.3 °C on 18 June 1945.
Compare Buin with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Buin