Porto Acre climate — normals and trends
Porto Acre (Brazil) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 25.3 °C and it receives 1,903 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 (26.4 °C on average) and the coldest is June (24.2 °C). Rainfall peaks in March.
Porto Acre averages 0 frost days, 222 hot days (≥ 30 °C) and 236 rainy days per year.
Porto Acre has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.5 °C (on 30 September 2010) and the coldest 9.0 °C (on 19 July 1975).
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 AcreAcre
- coords
- -9.59°, -67.53°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.3°C
Average daily high
30.6°C
Average daily low
21.8°C
Annual rainfall
1,903mm
Sunshine / day
9.0h
Mean relative humidity
85%
Average peak wind
8.7km/h
Seasonal range
2.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
222 d/yr
Rainy days (≥ 1 mm)
236 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.4 °C
Average feels-like low
25.4 °C
Average peak gust
25.9 km/h
Tropical nights (≥ 20 °C)
323 d/yr
Solar radiation
17.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.48 · 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
39.5 °C
30 September 2010
Coldest day
9.0 °C
19 July 1975
Wettest day
162 mm
11 December 2017
Windiest day
24.5 km/h
17 July 1975
Strongest gust
56.5 km/h
21 January 1965
Hottest feels-like
44.5 °C
3 October 2023
Coldest feels-like
5.8 °C
19 July 1975
Sunniest day
12.6 h
13 December 1942
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 | 30.8 °C | +0.8 °C | 244 mm | -17 mm |
| Feb | 30.0 °C | +0.2 °C | 336 mm | +66 mm |
| Mar | 30.6 °C | +0.6 °C | 369 mm | +97 mm |
| Apr | 30.4 °C | +0.8 °C | 247 mm | +56 mm |
| May | 30.9 °C | +1.7 °C | 79 mm | -27 mm |
| Jun | 30.0 °C | +0.5 °C | 43 mm | -3 mm |
| Jul | 32.6 °C | +1.7 °C | 17 mm | -11 mm |
| Aug | 34.5 °C | +1.9 °C | 17 mm | -30 mm |
| Sep | 33.4 °C | +0.8 °C | 93 mm | +5 mm |
| Oct | 32.1 °C | +0.2 °C | 159 mm | +11 mm |
| Nov | 30.7 °C | -0.1 °C | 211 mm | +7 mm |
| Dec | 29.7 °C | -0.5 °C | 299 mm | +56 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 Acre?
Porto Acre has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.3 °C and it receives 1,903 mm of precipitation per year.
What is the hottest day ever recorded in Porto Acre?
The hottest day measured in Porto Acre between 1940 and 2025 was 30 September 2010, reaching 39.5 °C.
What is the coldest day in Porto Acre?
The coldest day measured in Porto Acre between 1940 and 2025 was 19 July 1975, at 9.0 °C.
Does it snow in Porto Acre?
Almost never: Porto Acre sees virtually no snow, with about 0 frost days per year.
Has the climate of Porto Acre warmed?
Yes: Porto Acre warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Porto Acre?
The wettest day measured in Porto Acre between 1940 and 2025 was 11 December 2017, with 162 mm of rain in 24 hours.
What was the windiest day in Porto Acre?
The windiest day measured in Porto Acre between 1940 and 2025 was 17 July 1975, with winds reaching 24.5 km/h.
What is the warmest month in Porto Acre?
The warmest month in Porto Acre is September (26.4 °C on average); the coldest is June (24.2 °C).
How much does it rain in Porto Acre?
Porto Acre receives on average 1,903 mm of precipitation per year, spread over about 236 rainy days.
Is it sunny in Porto Acre?
Porto Acre gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
Are there tropical nights in Porto Acre?
Yes: Porto Acre has on average 323 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Porto Acre?
In Porto Acre, between 1940 and 2025, the highest apparent temperature reached 44.5 °C on 3 October 2023, and the lowest was 5.8 °C on 19 July 1975.
Compare Porto Acre with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Porto Acre