Formoso do Araguaia climate — normals and trends
Formoso do Araguaia (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.8 °C and it receives 1,664 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 (29.5 °C on average) and the coldest is January (25.8 °C). Rainfall peaks in January.
Formoso do Araguaia averages 0 frost days, 272 hot days (≥ 30 °C) and 168 rainy days per year.
Formoso do Araguaia has warmed by +0.4 °C between 1940 and 2025, or +0.05 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.4 °C (on 25 October 1961) and the coldest 12.7 °C (on 20 May 2022).
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
Formoso do AraguaiaTocantins
- coords
- -11.80°, -49.53°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.8°C
Average daily high
32.0°C
Average daily low
22.7°C
Annual rainfall
1,664mm
Sunshine / day
10.1h
Mean relative humidity
68%
Average peak wind
11.6km/h
Seasonal range
3.7°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
272 d/yr
Rainy days (≥ 1 mm)
168 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.0 °C
Average feels-like low
25.1 °C
Average peak gust
28.5 km/h
Tropical nights (≥ 20 °C)
349 d/yr
Solar radiation
18.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.4 °C
since 1940
+0.1 °C per decade · r² = 0.05 · p = 0.038
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
42.4 °C
25 October 1961
Coldest day
12.7 °C
20 May 2022
Wettest day
185 mm
2 February 1983
Windiest day
30.0 km/h
19 December 1953
Strongest gust
60.5 km/h
19 December 1953
Hottest feels-like
45.1 °C
12 November 2015
Coldest feels-like
11.3 °C
19 May 2022
Sunniest day
12.7 h
4 January 1940
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 | 29.7 °C | -0.3 °C | 337 mm | +42 mm |
| Feb | 30.9 °C | +0.9 °C | 149 mm | -115 mm |
| Mar | 31.5 °C | +1.5 °C | 178 mm | -89 mm |
| Apr | 31.7 °C | +1.0 °C | 83 mm | -73 mm |
| May | 32.7 °C | +0.9 °C | 18 mm | -18 mm |
| Jun | 33.4 °C | +0.9 °C | 1 mm | -1 mm |
| Jul | 33.8 °C | +0.7 °C | 0 mm | -1 mm |
| Aug | 35.7 °C | +0.7 °C | 0 mm | -2 mm |
| Sep | 36.7 °C | +0.9 °C | 6 mm | -17 mm |
| Oct | 35.6 °C | +2.1 °C | 21 mm | -102 mm |
| Nov | 32.2 °C | +1.1 °C | 114 mm | -109 mm |
| Dec | 30.9 °C | +0.6 °C | 259 mm | -15 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 Formoso do Araguaia?
Formoso do Araguaia has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.8 °C and it receives 1,664 mm of precipitation per year.
What is the hottest day ever recorded in Formoso do Araguaia?
The hottest day measured in Formoso do Araguaia between 1940 and 2025 was 25 October 1961, reaching 42.4 °C.
What is the coldest day in Formoso do Araguaia?
The coldest day measured in Formoso do Araguaia between 1940 and 2025 was 20 May 2022, at 12.7 °C.
Does it snow in Formoso do Araguaia?
Almost never: Formoso do Araguaia sees virtually no snow, with about 0 frost days per year.
Has the climate of Formoso do Araguaia warmed?
Yes: Formoso do Araguaia warmed by +0.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Formoso do Araguaia?
The wettest day measured in Formoso do Araguaia between 1940 and 2025 was 2 February 1983, with 185 mm of rain in 24 hours.
What was the windiest day in Formoso do Araguaia?
The windiest day measured in Formoso do Araguaia between 1940 and 2025 was 19 December 1953, with winds reaching 30.0 km/h.
What is the warmest month in Formoso do Araguaia?
The warmest month in Formoso do Araguaia is September (29.5 °C on average); the coldest is January (25.8 °C).
How much does it rain in Formoso do Araguaia?
Formoso do Araguaia receives on average 1,664 mm of precipitation per year, spread over about 168 rainy days.
Is it sunny in Formoso do Araguaia?
Formoso do Araguaia gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.
Are there tropical nights in Formoso do Araguaia?
Yes: Formoso do Araguaia has on average 349 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Formoso do Araguaia?
In Formoso do Araguaia, between 1940 and 2025, the highest apparent temperature reached 45.1 °C on 12 November 2015, and the lowest was 11.3 °C on 19 May 2022.
Compare Formoso do Araguaia with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Formoso do Araguaia