São Marcos climate — normals and trends
São Marcos (Brazil) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 1,811 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 (20.7 °C on average) and the coldest is July (11.4 °C). Rainfall peaks in January.
São Marcos averages 6 frost days, 6 hot days (≥ 30 °C) and 162 rainy days per year.
São Marcos has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.8 °C (on 16 November 1985) and the coldest -5.9 °C (on 25 July 2009).
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
São MarcosRio Grande do Sul
- coords
- -28.97°, -51.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.2°C
Average daily high
21.4°C
Average daily low
11.9°C
Annual rainfall
1,811mm
Sunshine / day
8.7h
Mean relative humidity
82%
Average peak wind
14.4km/h
Seasonal range
9.3°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
162 d/yr
Annual snowfall
0.4 cm
Average feels-like high
22.2 °C
Average feels-like low
10.9 °C
Average peak gust
34.7 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
16.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.21 · 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
34.8 °C
16 November 1985
Coldest day
-5.9 °C
25 July 2009
Wettest day
198 mm
24 January 1980
Windiest day
48.8 km/h
15 September 1956
Strongest gust
123.5 km/h
29 April 1992
Hottest feels-like
39.3 °C
6 February 2014
Coldest feels-like
-9.7 °C
25 July 2009
Snowiest day
3.2 cm
24 August 1984
Sunniest day
13.6 h
14 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 | 25.9 °C | 0.0 °C | 159 mm | -31 mm |
| Feb | 28.0 °C | +2.5 °C | 133 mm | -21 mm |
| Mar | 26.1 °C | +1.8 °C | 49 mm | -92 mm |
| Apr | 21.1 °C | -0.4 °C | 114 mm | -4 mm |
| May | 19.3 °C | +1.0 °C | 153 mm | +22 mm |
| Jun | 14.3 °C | -2.3 °C | 306 mm | +171 mm |
| Jul | 16.4 °C | -0.3 °C | 82 mm | -51 mm |
| Aug | 17.7 °C | -0.6 °C | 124 mm | -16 mm |
| Sep | 19.3 °C | -0.3 °C | 253 mm | +77 mm |
| Oct | 20.5 °C | -0.9 °C | 174 mm | -15 mm |
| Nov | 23.2 °C | -0.1 °C | 133 mm | -19 mm |
| Dec | 26.4 °C | +1.3 °C | 272 mm | +120 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 São Marcos?
São Marcos has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 1,811 mm of precipitation per year.
What is the hottest day ever recorded in São Marcos?
The hottest day measured in São Marcos between 1940 and 2025 was 16 November 1985, reaching 34.8 °C.
What is the coldest day in São Marcos?
The coldest day measured in São Marcos between 1940 and 2025 was 25 July 2009, at -5.9 °C.
Does it snow in São Marcos?
Almost never: São Marcos sees virtually no snow, with about 6 frost days per year.
Has the climate of São Marcos warmed?
Yes: São Marcos warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São Marcos?
The wettest day measured in São Marcos between 1940 and 2025 was 24 January 1980, with 198 mm of rain in 24 hours.
What was the windiest day in São Marcos?
The windiest day measured in São Marcos between 1940 and 2025 was 15 September 1956, with winds reaching 48.8 km/h.
What is the warmest month in São Marcos?
The warmest month in São Marcos is January (20.7 °C on average); the coldest is July (11.4 °C).
How much does it rain in São Marcos?
São Marcos receives on average 1,811 mm of precipitation per year, spread over about 162 rainy days.
Is it sunny in São Marcos?
São Marcos gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in São Marcos?
The heaviest 24-hour snowfall measured in São Marcos between 1940 and 2025 was 24 August 1984, with 3.2 cm.
Are there tropical nights in São Marcos?
Yes: São Marcos has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São Marcos?
In São Marcos, between 1940 and 2025, the highest apparent temperature reached 39.3 °C on 6 February 2014, and the lowest was -9.7 °C on 25 July 2009.
Compare São Marcos with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around São Marcos