Porto União climate — normals and trends
Porto União (Brazil) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 16.8 °C and it receives 1,336 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 (20.8 °C on average) and the coldest is July (12.3 °C). Rainfall peaks in January.
Porto União averages 4 frost days, 10 hot days (≥ 30 °C) and 155 rainy days per year.
Porto União has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The number of frost days there went from about 3 to 5 per year over the period.
The hottest day of the period reached 35.7 °C (on 16 November 1985) and the coldest -6.1 °C (on 3 August 1991).
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
Porto UniãoSanta Catarina
- coords
- -26.24°, -51.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.8°C
Average daily high
22.4°C
Average daily low
12.6°C
Annual rainfall
1,336mm
Sunshine / day
7.6h
Mean relative humidity
83%
Average peak wind
13.0km/h
Seasonal range
8.5°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
155 d/yr
Annual snowfall
0.0 cm
Average feels-like high
23.6 °C
Average feels-like low
12.3 °C
Average peak gust
31.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
15.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.33 · 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
35.7 °C
16 November 1985
Coldest day
-6.1 °C
3 August 1991
Wettest day
121 mm
26 April 2012
Windiest day
38.5 km/h
10 December 2025
Strongest gust
97.2 km/h
2 July 1983
Hottest feels-like
39.2 °C
1 March 2003
Coldest feels-like
-10.5 °C
18 July 1975
Snowiest day
1.8 cm
21 August 1965
Sunniest day
13.5 h
7 December 2019
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 | 27.0 °C | +0.8 °C | 97 mm | -59 mm |
| Feb | 28.3 °C | +2.3 °C | 113 mm | -24 mm |
| Mar | 27.3 °C | +2.3 °C | 83 mm | -20 mm |
| Apr | 22.4 °C | -0.1 °C | 59 mm | -16 mm |
| May | 20.8 °C | +1.3 °C | 79 mm | -13 mm |
| Jun | 17.0 °C | -1.0 °C | 142 mm | +57 mm |
| Jul | 17.5 °C | -0.5 °C | 41 mm | -38 mm |
| Aug | 18.5 °C | -1.4 °C | 106 mm | +20 mm |
| Sep | 21.1 °C | -0.1 °C | 112 mm | -14 mm |
| Oct | 21.2 °C | -1.4 °C | 151 mm | +1 mm |
| Nov | 24.7 °C | +0.3 °C | 137 mm | +20 mm |
| Dec | 27.5 °C | +1.8 °C | 103 mm | -27 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 Porto União?
Porto União has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 16.8 °C and it receives 1,336 mm of precipitation per year.
What is the hottest day ever recorded in Porto União?
The hottest day measured in Porto União between 1940 and 2025 was 16 November 1985, reaching 35.7 °C.
What is the coldest day in Porto União?
The coldest day measured in Porto União between 1940 and 2025 was 3 August 1991, at -6.1 °C.
Does it snow in Porto União?
Almost never: Porto União sees virtually no snow, with about 4 frost days per year.
Has the climate of Porto União warmed?
Yes: Porto União warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Porto União?
The wettest day measured in Porto União between 1940 and 2025 was 26 April 2012, with 121 mm of rain in 24 hours.
What was the windiest day in Porto União?
The windiest day measured in Porto União between 1940 and 2025 was 10 December 2025, with winds reaching 38.5 km/h.
What is the warmest month in Porto União?
The warmest month in Porto União is January (20.8 °C on average); the coldest is July (12.3 °C).
How much does it rain in Porto União?
Porto União receives on average 1,336 mm of precipitation per year, spread over about 155 rainy days.
Is it sunny in Porto União?
Porto União gets on average 7.6 hours of sunshine per day, roughly 2,774 hours per year over 1940-2025.
What is the biggest single-day snowfall in Porto União?
The heaviest 24-hour snowfall measured in Porto União between 1940 and 2025 was 21 August 1965, with 1.8 cm.
Are there tropical nights in Porto União?
Yes: Porto União has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Porto União?
In Porto União, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 1 March 2003, and the lowest was -10.5 °C on 18 July 1975.
Compare Porto União with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Porto União