Ariquemes climate — normals and trends
Ariquemes (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.6 °C and it receives 1,815 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 (26.9 °C on average) and the coldest is May (24.8 °C). Rainfall peaks in January.
Ariquemes averages 0 frost days, 239 hot days (≥ 30 °C) and 222 rainy days per year.
Ariquemes 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 40.0 °C (on 15 October 1963) and the coldest 11.0 °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
AriquemesRondônia
- coords
- -9.91°, -63.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.6°C
Average daily high
31.1°C
Average daily low
21.9°C
Annual rainfall
1,815mm
Sunshine / day
9.5h
Mean relative humidity
83%
Average peak wind
8.5km/h
Seasonal range
2.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
239 d/yr
Rainy days (≥ 1 mm)
222 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.5 °C
Average feels-like low
25.6 °C
Average peak gust
25.8 km/h
Tropical nights (≥ 20 °C)
332 d/yr
Solar radiation
17.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.49 · 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
40.0 °C
15 October 1963
Coldest day
11.0 °C
19 July 1975
Wettest day
181 mm
20 January 1965
Windiest day
23.9 km/h
18 February 1965
Strongest gust
58.7 km/h
19 August 2022
Hottest feels-like
45.8 °C
24 October 2015
Coldest feels-like
6.4 °C
18 July 1975
Sunniest day
12.6 h
4 January 1949
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 | 30.4 °C | +0.6 °C | 222 mm | -56 mm |
| Feb | 30.3 °C | +0.6 °C | 181 mm | -86 mm |
| Mar | 30.4 °C | +0.6 °C | 295 mm | +33 mm |
| Apr | 30.9 °C | +1.2 °C | 206 mm | +25 mm |
| May | 31.2 °C | +1.5 °C | 63 mm | -30 mm |
| Jun | 32.1 °C | +1.3 °C | 24 mm | +0 mm |
| Jul | 33.8 °C | +1.3 °C | 0 mm | -14 mm |
| Aug | 34.7 °C | +0.8 °C | 12 mm | -21 mm |
| Sep | 34.7 °C | +1.3 °C | 56 mm | -27 mm |
| Oct | 33.5 °C | +1.1 °C | 90 mm | -47 mm |
| Nov | 32.1 °C | +1.2 °C | 212 mm | +15 mm |
| Dec | 29.8 °C | -0.3 °C | 345 mm | +100 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 Ariquemes?
Ariquemes has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.6 °C and it receives 1,815 mm of precipitation per year.
What is the hottest day ever recorded in Ariquemes?
The hottest day measured in Ariquemes between 1940 and 2025 was 15 October 1963, reaching 40.0 °C.
What is the coldest day in Ariquemes?
The coldest day measured in Ariquemes between 1940 and 2025 was 19 July 1975, at 11.0 °C.
Does it snow in Ariquemes?
Almost never: Ariquemes sees virtually no snow, with about 0 frost days per year.
Has the climate of Ariquemes warmed?
Yes: Ariquemes warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ariquemes?
The wettest day measured in Ariquemes between 1940 and 2025 was 20 January 1965, with 181 mm of rain in 24 hours.
What was the windiest day in Ariquemes?
The windiest day measured in Ariquemes between 1940 and 2025 was 18 February 1965, with winds reaching 23.9 km/h.
What is the warmest month in Ariquemes?
The warmest month in Ariquemes is September (26.9 °C on average); the coldest is May (24.8 °C).
How much does it rain in Ariquemes?
Ariquemes receives on average 1,815 mm of precipitation per year, spread over about 222 rainy days.
Is it sunny in Ariquemes?
Ariquemes gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
Are there tropical nights in Ariquemes?
Yes: Ariquemes has on average 332 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ariquemes?
In Ariquemes, between 1940 and 2025, the highest apparent temperature reached 45.8 °C on 24 October 2015, and the lowest was 6.4 °C on 18 July 1975.
Compare Ariquemes with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ariquemes