Climate averages 1991–2020
Castanhal weather
in August.
A hot, moderately wet month: the 5th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Castanhal: daytime highs average 31.2°C and nights cool to about 23.0°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 51 mm of rain on roughly 13 days, which makes August a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 04 min on an average August day.
The nearest other city in this atlas is Santa Isabel do Pará (26 km away). In August its highs average 31.1°C, about as warm as Castanhal, with 56 mm of rain.
Among the 448 cities listed in Brazil, Castanhal ranks joint 60th of 448 for the warmest August highs and joint 308th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Castanhal is 5.0°C warmer than that mean.
From August to September, average highs rise by 1.1°C to 32.3°C, and monthly rainfall falls from 51 mm to 34 mm.
The annual picture
August 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
Castanhal climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.8°C23.3°C | 23.3°C | 269 | 27.0 | 12.212 h |
| February | 29.0°C23.0°C | 23.0°C | 357 | 27.2 | 12.212 h |
| March | 28.9°C22.9°C | 22.9°C | 456 | 30.5 | 12.112 h |
| April | 28.9°C23.0°C | 23.0°C | 427 | 29.6 | 12.112 h |
| May | 29.4°C23.0°C | 23.0°C | 278 | 27.7 | 12.112 h |
| June | 29.7°C22.7°C | 22.7°C | 120 | 21.4 | 12.012 h |
| July | 30.0°C22.6°C | 22.6°C | 91 | 18.1 | 12.112 h |
| August, selected | 31.2°C23.0°C | 23.0°C | 51 | 12.7 | 12.112 h |
| September | 32.3°C23.4°C | 23.4°C | 34 | 8.6 | 12.112 h |
| October | 33.1°C23.7°C | 23.7°C | 34 | 8.0 | 12.112 h |
| November | 32.9°C24.0°C | 24.0°C | 49 | 8.7 | 12.212 h |
| December | 31.8°C24.0°C | 24.0°C | 118 | 17.2 | 12.212 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
August in nearby cities
- Santa Isabel do Pará in AugustBrazil · 26 kmHigh 31.1°C · Low 23.4°C · 56 mm rain
- Marituba in AugustBrazil · 47 kmHigh 31.4°C · Low 23.6°C · 56 mm rain
- Ananindeua in AugustBrazil · 50 kmHigh 31.2°C · Low 23.9°C · 56 mm rain
- Belém in AugustBrazil · 67 kmHigh 30.9°C · Low 24.4°C · 36 mm rain
- Barcarena in AugustBrazil · 81 kmHigh 31.0°C · Low 24.6°C · 34 mm rain
- Capanema in AugustBrazil · 84 kmHigh 30.7°C · Low 23.1°C · 46 mm rain
- Moju in AugustBrazil · 114 kmHigh 32.4°C · Low 23.7°C · 34 mm rain
- Abaetetuba in AugustBrazil · 116 kmHigh 31.5°C · Low 24.6°C · 30 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 Castanhal) is explained once on the Castanhal year overview and on the Sources, method and limits page.