Jaru climate — normals and trends
Jaru (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.4 °C and it receives 1,703 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 (26.8 °C on average) and the coldest is May (24.5 °C). Rainfall peaks in January.
Jaru averages 0 frost days, 217 hot days (≥ 30 °C) and 219 rainy days per year.
Jaru has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 40.4 °C (on 16 September 1961) and the coldest 10.6 °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
JaruRondônia
- coords
- -10.44°, -62.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.4°C
Average daily high
30.7°C
Average daily low
21.7°C
Annual rainfall
1,703mm
Sunshine / day
9.7h
Mean relative humidity
81%
Average peak wind
9.0km/h
Seasonal range
2.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
217 d/yr
Rainy days (≥ 1 mm)
219 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.8 °C
Average feels-like low
25.1 °C
Average peak gust
26.3 km/h
Tropical nights (≥ 20 °C)
328 d/yr
Solar radiation
18.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.44 · 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
40.4 °C
16 September 1961
Coldest day
10.6 °C
19 July 1975
Wettest day
191 mm
20 January 1965
Windiest day
26.0 km/h
14 August 1978
Strongest gust
60.1 km/h
19 August 2022
Hottest feels-like
44.2 °C
20 October 2016
Coldest feels-like
5.5 °C
18 July 1975
Sunniest day
12.6 h
7 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 | 29.9 °C | +0.5 °C | 237 mm | -30 mm |
| Feb | 29.5 °C | +0.2 °C | 211 mm | -49 mm |
| Mar | 30.2 °C | +0.8 °C | 280 mm | +36 mm |
| Apr | 30.5 °C | +1.1 °C | 191 mm | +31 mm |
| May | 30.6 °C | +1.3 °C | 50 mm | -27 mm |
| Jun | 31.7 °C | +1.3 °C | 12 mm | -9 mm |
| Jul | 33.2 °C | +1.1 °C | 0 mm | -12 mm |
| Aug | 34.1 °C | +0.6 °C | 5 mm | -24 mm |
| Sep | 34.4 °C | +1.2 °C | 51 mm | -25 mm |
| Oct | 33.5 °C | +1.5 °C | 98 mm | -36 mm |
| Nov | 32.3 °C | +1.7 °C | 151 mm | -37 mm |
| Dec | 29.2 °C | -0.5 °C | 346 mm | +107 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 Jaru?
Jaru has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.4 °C and it receives 1,703 mm of precipitation per year.
What is the hottest day ever recorded in Jaru?
The hottest day measured in Jaru between 1940 and 2025 was 16 September 1961, reaching 40.4 °C.
What is the coldest day in Jaru?
The coldest day measured in Jaru between 1940 and 2025 was 19 July 1975, at 10.6 °C.
Does it snow in Jaru?
Almost never: Jaru sees virtually no snow, with about 0 frost days per year.
Has the climate of Jaru warmed?
Yes: Jaru warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Jaru?
The wettest day measured in Jaru between 1940 and 2025 was 20 January 1965, with 191 mm of rain in 24 hours.
What was the windiest day in Jaru?
The windiest day measured in Jaru between 1940 and 2025 was 14 August 1978, with winds reaching 26.0 km/h.
What is the warmest month in Jaru?
The warmest month in Jaru is September (26.8 °C on average); the coldest is May (24.5 °C).
How much does it rain in Jaru?
Jaru receives on average 1,703 mm of precipitation per year, spread over about 219 rainy days.
Is it sunny in Jaru?
Jaru gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.
Are there tropical nights in Jaru?
Yes: Jaru has on average 328 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Jaru?
In Jaru, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 20 October 2016, and the lowest was 5.5 °C on 18 July 1975.
Compare Jaru with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Jaru