Rosarito climate — normals and trends
Rosarito (Mexico) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 287 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 (20.1 °C on average) and the coldest is January (13.3 °C). Rainfall peaks in February.
Rosarito averages 0 frost days, 0 hot days (≥ 30 °C) and 37 rainy days per year.
Rosarito 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 32.5 °C (on 22 October 1965) and the coldest 3.9 °C (on 4 January 1949).
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
RosaritoBaja California
- coords
- 32.36°, -117.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.2°C
Average daily high
18.3°C
Average daily low
14.4°C
Annual rainfall
287mm
Sunshine / day
11.3h
Mean relative humidity
77%
Average peak wind
18.0km/h
Seasonal range
6.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
37 d/yr
Annual snowfall
0.0 cm
Average feels-like high
18.2 °C
Average feels-like low
13.5 °C
Average peak gust
29.3 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °C
since 1940
+0.1 °C per decade · r² = 0.20 · 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
32.5 °C
22 October 1965
Coldest day
3.9 °C
4 January 1949
Wettest day
73 mm
29 January 1980
Windiest day
55.3 km/h
21 January 2010
Strongest gust
102.2 km/h
7 December 2009
Hottest feels-like
34.6 °C
4 September 1988
Coldest feels-like
-3.9 °C
13 January 1963
Snowiest day
0.2 cm
14 December 1967
Sunniest day
13.9 h
7 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 15.7 °C | -0.1 °C | 12 mm | -42 mm |
| Feb | 16.3 °C | +0.6 °C | 20 mm | -37 mm |
| Mar | 15.1 °C | -0.6 °C | 77 mm | +24 mm |
| Apr | 15.9 °C | -0.6 °C | 11 mm | -11 mm |
| May | 17.5 °C | +0.2 °C | 7 mm | +1 mm |
| Jun | 19.1 °C | +0.3 °C | 2 mm | +1 mm |
| Jul | 20.1 °C | -1.0 °C | 1 mm | +0 mm |
| Aug | 22.1 °C | +0.2 °C | 19 mm | +18 mm |
| Sep | 22.0 °C | +0.1 °C | 12 mm | +8 mm |
| Oct | 20.3 °C | -0.1 °C | 7 mm | -6 mm |
| Nov | 18.8 °C | +0.4 °C | 80 mm | +51 mm |
| Dec | 18.5 °C | +2.2 °C | 30 mm | -15 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 Rosarito?
Rosarito has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 287 mm of precipitation per year.
What is the hottest day ever recorded in Rosarito?
The hottest day measured in Rosarito between 1940 and 2025 was 22 October 1965, reaching 32.5 °C.
What is the coldest day in Rosarito?
The coldest day measured in Rosarito between 1940 and 2025 was 4 January 1949, at 3.9 °C.
Does it snow in Rosarito?
Almost never: Rosarito sees virtually no snow, with about 0 frost days per year.
Has the climate of Rosarito warmed?
Yes: Rosarito warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rosarito?
The wettest day measured in Rosarito between 1940 and 2025 was 29 January 1980, with 73 mm of rain in 24 hours.
What was the windiest day in Rosarito?
The windiest day measured in Rosarito between 1940 and 2025 was 21 January 2010, with winds reaching 55.3 km/h.
What is the warmest month in Rosarito?
The warmest month in Rosarito is August (20.1 °C on average); the coldest is January (13.3 °C).
How much does it rain in Rosarito?
Rosarito receives on average 287 mm of precipitation per year, spread over about 37 rainy days.
Is it sunny in Rosarito?
Rosarito gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rosarito?
The heaviest 24-hour snowfall measured in Rosarito between 1940 and 2025 was 14 December 1967, with 0.2 cm.
Are there tropical nights in Rosarito?
Yes: Rosarito has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rosarito?
In Rosarito, between 1940 and 2025, the highest apparent temperature reached 34.6 °C on 4 September 1988, and the lowest was -3.9 °C on 13 January 1963.
Compare Rosarito with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rosarito