Castanhal weather in August
In August, Castanhal has daytime highs averaging 31 °C, nights around 23 °C, with 13 wet days. Figures are 1991–2020 climate normals.
- 31.2°C Average high
- 23.0°C Average low
- 13days Wet days
- 52mm Rainfall
- 12h Daylight
Daily temperatures through August
How August develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 August | 30.9 °C | 22.9 °C | 41 % |
| 11–20 August | 31.2 °C | 22.9 °C | 41 % |
| 21–31 August | 31.6 °C | 23.1 °C | 39 % |
What to expect
| Measure | Typical August | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 28 of 31 | 92 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 13 of 31 | 41 % |
Conditions in August
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 35 °C |
| Record low (1991–2020) | 21 °C |
| Relative humidity | 79 % |
| Wind speed | 13 km/h |
| Cloud cover | 37 % |
Where Castanhal ranks in August
| Ranking | Position | Value |
|---|---|---|
| The warmest places in South America in August | 43rdof 50 | 31 °C |
August compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| June | 29.8 °C | 124 mm | 53 % |
| July | 30.1 °C | 93 mm | 44 % |
| August | 31.2 °C | 52 mm | 37 % |
| September | 32.3 °C | 35 mm | 38 % |
| October | 33.1 °C | 34 mm | 46 % |
See all twelve months for Castanhal
- August is the 5th warmest month here.
- It is the 3rd driest month of the year.
- It ranks 1st for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 13 of 31 days — 41 % of the month.
- Nights are about 8.2 °C cooler than the middle of the day.
- The hottest August day on record since 1991 reached 35 °C, 3.9 °C above the usual daytime high.
Nearby destinations in August
| Destination | Avg high | Wet days | Sea |
|---|---|---|---|
| Castanhal | 31 °C | 13 | – |
| Ananindeua | 31 °C | 14 | 29 |
| Belém | 31 °C | 10 | 29 |
| Abaetetuba | 32 °C | 9 | – |
QuestionsAugust in Castanhal, answered
How warm is Castanhal in August?
Daily highs average 31 °C and nights fall to about 23 °C, a spread of 8.2 °C between afternoon and dawn. That makes August the 5th warmest month of the year here.
Does it rain much in Castanhal in August?
August averages 52 mm of rain, spread over about 13 of the 31 days — 41 % of the month. Cloud cover averages 37 % of the sky.
How long are the days in August?
Castanhal averages 12 hours between sunrise and sunset in August. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.