Rosário Oeste climate — normals and trends
Rosário Oeste (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.5 °C and it receives 1,394 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 September (27.3 °C on average) and the coldest is June (23.5 °C). Rainfall peaks in January.
Rosário Oeste averages 0 frost days, 240 hot days (≥ 30 °C) and 174 rainy days per year.
Rosário Oeste has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.0 °C (on 14 October 1963) and the coldest 6.6 °C (on 21 August 1965).
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
Rosário OesteMato Grosso
- coords
- -14.84°, -56.43°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.5°C
Average daily high
31.0°C
Average daily low
21.3°C
Annual rainfall
1,394mm
Sunshine / day
10.2h
Mean relative humidity
74%
Average peak wind
10.8km/h
Seasonal range
3.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
240 d/yr
Rainy days (≥ 1 mm)
174 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.3 °C
Average feels-like low
23.8 °C
Average peak gust
27.8 km/h
Tropical nights (≥ 20 °C)
278 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.36 · 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
42.0 °C
14 October 1963
Coldest day
6.6 °C
21 August 1965
Wettest day
143 mm
28 December 1961
Windiest day
29.2 km/h
28 September 1961
Strongest gust
80.3 km/h
12 January 1965
Hottest feels-like
45.9 °C
20 October 1999
Coldest feels-like
2.1 °C
30 July 1955
Sunniest day
12.8 h
1 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 | 30.5 °C | +0.3 °C | 178 mm | -60 mm |
| Feb | 30.3 °C | +0.2 °C | 140 mm | -83 mm |
| Mar | 30.9 °C | +0.6 °C | 107 mm | -95 mm |
| Apr | 30.3 °C | +0.2 °C | 95 mm | -15 mm |
| May | 30.9 °C | +1.4 °C | 27 mm | -14 mm |
| Jun | 30.5 °C | +0.6 °C | 23 mm | +15 mm |
| Jul | 30.8 °C | +0.2 °C | 0 mm | -7 mm |
| Aug | 33.0 °C | +0.2 °C | 1 mm | -10 mm |
| Sep | 36.0 °C | +2.3 °C | 10 mm | -34 mm |
| Oct | 33.8 °C | +1.2 °C | 42 mm | -79 mm |
| Nov | 33.2 °C | +2.0 °C | 78 mm | -96 mm |
| Dec | 30.4 °C | 0.0 °C | 266 mm | +49 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 Rosário Oeste?
Rosário Oeste has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.5 °C and it receives 1,394 mm of precipitation per year.
What is the hottest day ever recorded in Rosário Oeste?
The hottest day measured in Rosário Oeste between 1940 and 2025 was 14 October 1963, reaching 42.0 °C.
What is the coldest day in Rosário Oeste?
The coldest day measured in Rosário Oeste between 1940 and 2025 was 21 August 1965, at 6.6 °C.
Does it snow in Rosário Oeste?
Almost never: Rosário Oeste sees virtually no snow, with about 0 frost days per year.
Has the climate of Rosário Oeste warmed?
Yes: Rosário Oeste warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rosário Oeste?
The wettest day measured in Rosário Oeste between 1940 and 2025 was 28 December 1961, with 143 mm of rain in 24 hours.
What was the windiest day in Rosário Oeste?
The windiest day measured in Rosário Oeste between 1940 and 2025 was 28 September 1961, with winds reaching 29.2 km/h.
What is the warmest month in Rosário Oeste?
The warmest month in Rosário Oeste is September (27.3 °C on average); the coldest is June (23.5 °C).
How much does it rain in Rosário Oeste?
Rosário Oeste receives on average 1,394 mm of precipitation per year, spread over about 174 rainy days.
Is it sunny in Rosário Oeste?
Rosário Oeste gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Rosário Oeste?
Yes: Rosário Oeste has on average 278 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rosário Oeste?
In Rosário Oeste, between 1940 and 2025, the highest apparent temperature reached 45.9 °C on 20 October 1999, and the lowest was 2.1 °C on 30 July 1955.
Compare Rosário Oeste with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rosário Oeste