Tonantins climate — normals and trends
Tonantins (Brazil) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 25.5 °C and it receives 2,725 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 October (26.1 °C on average) and the coldest is June (24.8 °C). Rainfall peaks in April.
Tonantins averages 0 frost days, 155 hot days (≥ 30 °C) and 320 rainy days per year.
Tonantins has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.6 °C (on 3 October 2023) and the coldest 17.0 °C (on 1 August 1955).
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
TonantinsAmazonas
- coords
- -2.87°, -67.80°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.5°C
Average daily high
29.7°C
Average daily low
22.8°C
Annual rainfall
2,725mm
Sunshine / day
8.9h
Mean relative humidity
90%
Average peak wind
7.3km/h
Seasonal range
1.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
155 d/yr
Rainy days (≥ 1 mm)
320 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.3 °C
Average feels-like low
27.4 °C
Average peak gust
25.5 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
16.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.69 · 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
37.6 °C
3 October 2023
Coldest day
17.0 °C
1 August 1955
Wettest day
156 mm
30 March 2021
Windiest day
19.2 km/h
31 May 1941
Strongest gust
52.6 km/h
5 February 1959
Hottest feels-like
45.3 °C
27 September 2023
Coldest feels-like
16.3 °C
19 July 1975
Sunniest day
12.1 h
17 December 1961
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 30.5 °C | +0.8 °C | 282 mm | +24 mm |
| Feb | 29.9 °C | 0.0 °C | 466 mm | +210 mm |
| Mar | 30.7 °C | +0.9 °C | 309 mm | +5 mm |
| Apr | 30.2 °C | +0.9 °C | 415 mm | +87 mm |
| May | 29.2 °C | +0.4 °C | 348 mm | +47 mm |
| Jun | 29.3 °C | +0.7 °C | 265 mm | +61 mm |
| Jul | 29.3 °C | +0.5 °C | 121 mm | -35 mm |
| Aug | 30.3 °C | +0.5 °C | 147 mm | +15 mm |
| Sep | 31.1 °C | +0.6 °C | 130 mm | -17 mm |
| Oct | 30.5 °C | -0.1 °C | 170 mm | -12 mm |
| Nov | 29.8 °C | -0.4 °C | 271 mm | +59 mm |
| Dec | 29.9 °C | +0.1 °C | 297 mm | +54 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 Tonantins?
Tonantins has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 25.5 °C and it receives 2,725 mm of precipitation per year.
What is the hottest day ever recorded in Tonantins?
The hottest day measured in Tonantins between 1940 and 2025 was 3 October 2023, reaching 37.6 °C.
What is the coldest day in Tonantins?
The coldest day measured in Tonantins between 1940 and 2025 was 1 August 1955, at 17.0 °C.
Does it snow in Tonantins?
Almost never: Tonantins sees virtually no snow, with about 0 frost days per year.
Has the climate of Tonantins warmed?
Yes: Tonantins warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Tonantins?
The wettest day measured in Tonantins between 1940 and 2025 was 30 March 2021, with 156 mm of rain in 24 hours.
What was the windiest day in Tonantins?
The windiest day measured in Tonantins between 1940 and 2025 was 31 May 1941, with winds reaching 19.2 km/h.
What is the warmest month in Tonantins?
The warmest month in Tonantins is October (26.1 °C on average); the coldest is June (24.8 °C).
How much does it rain in Tonantins?
Tonantins receives on average 2,725 mm of precipitation per year, spread over about 320 rainy days.
Is it sunny in Tonantins?
Tonantins gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
Are there tropical nights in Tonantins?
Yes: Tonantins has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Tonantins?
In Tonantins, between 1940 and 2025, the highest apparent temperature reached 45.3 °C on 27 September 2023, and the lowest was 16.3 °C on 19 July 1975.
Compare Tonantins with another city
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Nearby cities
The climate around Tonantins