San Jose de Mayo climate — normals and trends
San Jose de Mayo (Uruguay) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.7 °C and it receives 1,046 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 (23.6 °C on average) and the coldest is July (10.3 °C). Rainfall peaks in March.
San Jose de Mayo averages 3 frost days, 39 hot days (≥ 30 °C) and 96 rainy days per year.
San Jose de Mayo has warmed by +0.4 °C between 1940 and 2025, or +0.05 °C per decade. This trend is statistically significant.
The number of frost days there went from about 2 to 4 per year over the period.
The hottest day of the period reached 41.2 °C (on 14 January 2022) and the coldest -4.7 °C (on 14 June 1967).
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
San Jose de MayoSan José Department
- coords
- -34.34°, -56.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.7°C
Average daily high
21.9°C
Average daily low
11.9°C
Annual rainfall
1,046mm
Sunshine / day
9.4h
Mean relative humidity
74%
Average peak wind
19.1km/h
Seasonal range
13.3°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
39 d/yr
Rainy days (≥ 1 mm)
96 d/yr
Annual snowfall
0.0 cm
Average feels-like high
21.6 °C
Average feels-like low
10.4 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
22 d/yr
Solar radiation
17.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.4 °C
since 1940
+0.1 °C per decade · r² = 0.07 · p = 0.018
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
41.2 °C
14 January 2022
Coldest day
-4.7 °C
14 June 1967
Wettest day
120 mm
12 April 1959
Windiest day
58.0 km/h
29 May 1984
Strongest gust
101.2 km/h
17 October 1982
Hottest feels-like
42.9 °C
2 February 1947
Coldest feels-like
-9.1 °C
14 June 1967
Sunniest day
14.0 h
18 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 | 29.7 °C | +0.4 °C | 83 mm | -4 mm |
| Feb | 29.7 °C | +1.5 °C | 93 mm | -6 mm |
| Mar | 26.8 °C | +0.8 °C | 109 mm | +4 mm |
| Apr | 21.7 °C | -0.5 °C | 52 mm | -36 mm |
| May | 19.9 °C | +1.4 °C | 93 mm | +14 mm |
| Jun | 14.4 °C | -1.0 °C | 46 mm | -29 mm |
| Jul | 15.2 °C | +0.2 °C | 30 mm | -47 mm |
| Aug | 16.9 °C | +0.4 °C | 87 mm | +2 mm |
| Sep | 18.9 °C | +0.5 °C | 53 mm | -35 mm |
| Oct | 22.6 °C | +1.5 °C | 57 mm | -45 mm |
| Nov | 24.8 °C | +0.4 °C | 71 mm | -17 mm |
| Dec | 30.7 °C | +3.1 °C | 46 mm | -28 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 San Jose de Mayo?
San Jose de Mayo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.7 °C and it receives 1,046 mm of precipitation per year.
What is the hottest day ever recorded in San Jose de Mayo?
The hottest day measured in San Jose de Mayo between 1940 and 2025 was 14 January 2022, reaching 41.2 °C.
What is the coldest day in San Jose de Mayo?
The coldest day measured in San Jose de Mayo between 1940 and 2025 was 14 June 1967, at -4.7 °C.
Does it snow in San Jose de Mayo?
Almost never: San Jose de Mayo sees virtually no snow, with about 3 frost days per year.
Has the climate of San Jose de Mayo warmed?
Yes: San Jose de Mayo warmed by +0.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Jose de Mayo?
The wettest day measured in San Jose de Mayo between 1940 and 2025 was 12 April 1959, with 120 mm of rain in 24 hours.
What was the windiest day in San Jose de Mayo?
The windiest day measured in San Jose de Mayo between 1940 and 2025 was 29 May 1984, with winds reaching 58.0 km/h.
What is the warmest month in San Jose de Mayo?
The warmest month in San Jose de Mayo is January (23.6 °C on average); the coldest is July (10.3 °C).
How much does it rain in San Jose de Mayo?
San Jose de Mayo receives on average 1,046 mm of precipitation per year, spread over about 96 rainy days.
Is it sunny in San Jose de Mayo?
San Jose de Mayo gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
Are there tropical nights in San Jose de Mayo?
Yes: San Jose de Mayo has on average 22 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Jose de Mayo?
In San Jose de Mayo, between 1940 and 2025, the highest apparent temperature reached 42.9 °C on 2 February 1947, and the lowest was -9.1 °C on 14 June 1967.
Compare San Jose de Mayo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Jose de Mayo