Climate averages 1991–2020
Cacoal weather
in May.
A hot, moderately wet month: the joint 8th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Cacoal: daytime highs average 29.3°C and nights cool to about 21.6°C. By daytime temperature it is the joint 8th warmest of the 12 months.
Expect about 77 mm of rain on roughly 13 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 36 min on an average May day.
The nearest other city in this atlas is Ji Paraná (83 km away). In May its highs average 29.2°C, about as warm as Cacoal, with 78 mm of rain.
Among the 448 cities listed in Brazil, Cacoal ranks joint 57th of 448 for the warmest May highs and joint 255th of 448 for the driest May (rainfall, lowest first). The mean May high of those 448 cities is 25.3°C; Cacoal is 4.0°C warmer than that mean.
From May to June, average highs rise by 1.4°C to 30.7°C, and monthly rainfall falls from 77 mm to 17 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Cacoal climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C22.7°C | 22.7°C | 308 | 29.3 | 12.713 h |
| February | 28.9°C22.6°C | 22.6°C | 299 | 26.6 | 12.512 h |
| March | 29.2°C22.6°C | 22.6°C | 270 | 28.2 | 12.212 h |
| April | 29.3°C22.4°C | 22.4°C | 151 | 22.3 | 11.912 h |
| May, selected | 29.3°C21.6°C | 21.6°C | 77 | 13.4 | 11.612 h |
| June | 30.7°C20.5°C | 20.5°C | 17 | 3.5 | 11.511 h |
| July | 32.2°C20.3°C | 20.3°C | 11 | 2.1 | 11.512 h |
| August | 33.7°C21.5°C | 21.5°C | 26 | 4.7 | 11.712 h |
| September | 33.3°C23.0°C | 23.0°C | 90 | 14.1 | 12.012 h |
| October | 32.0°C23.2°C | 23.2°C | 156 | 21.7 | 12.312 h |
| November | 30.3°C22.9°C | 22.9°C | 239 | 24.9 | 12.613 h |
| December | 29.4°C22.8°C | 22.8°C | 284 | 27.9 | 12.813 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Ji Paraná in MayBrazil · 83 kmHigh 29.2°C · Low 21.8°C · 78 mm rain
- Vilhena in MayBrazil · 202 kmHigh 27.5°C · Low 19.4°C · 57 mm rain
- Ariquemes in MayBrazil · 243 kmHigh 29.3°C · Low 22.2°C · 91 mm rain
- Porto Velho in MayBrazil · 401 kmHigh 29.1°C · Low 22.9°C · 133 mm rain
- Riberalta in MayBolivia · 505 kmHigh 28.5°C · Low 22.0°C · 81 mm rain
- Trinidad in MayBolivia · 531 kmHigh 27.6°C · Low 20.9°C · 84 mm rain
- Tangará da Serra in MayBrazil · 556 kmHigh 27.9°C · Low 19.4°C · 41 mm rain
- Lucas do Rio Verde in MayBrazil · 628 kmHigh 30.1°C · Low 20.7°C · 24 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Cacoal) is explained once on the Cacoal year overview and on the Sources, method and limits page.