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Castanhal Weather by Month
Average temperatures, rainfall and humidity for Castanhal, Brazil, month by month, built from OpenWeather's historical records. Use it to see what a typical Castanhal month looks like before you travel — then check the live Castanhal forecast for the days ahead.
Warmest month
October
33°C average high
Coolest month
July
23°C average low
Wettest month
April
296 mm of rain
Driest month
September
26 mm of rain
Average temperature and rainfall in Castanhal by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 30°C | 23°C | 20°C / 38°C | 115 mm | 85% | 8 km/h |
| February | 29°C | 23°C | 21°C / 37°C | 187 mm | 90% | 7 km/h |
| March | 29°C | 23°C | 21°C / 36°C | 253 mm | 91% | 7 km/h |
| April | 29°C | 23°C | 21°C / 34°C | 296 mm | 90% | 7 km/h |
| May | 30°C | 23°C | 21°C / 33°C | 134 mm | 89% | 7 km/h |
| June | 31°C | 23°C | 20°C / 34°C | 52 mm | 85% | 8 km/h |
| July | 31°C | 23°C | 20°C / 35°C | 51 mm | 81% | 9 km/h |
| August | 32°C | 23°C | 19°C / 38°C | 36 mm | 80% | 10 km/h |
| September | 33°C | 23°C | 20°C / 40°C | 26 mm | 78% | 11 km/h |
| October | 33°C | 23°C | 14°C / 41°C | 36 mm | 77% | 10 km/h |
| November | 33°C | 24°C | 20°C / 41°C | 44 mm | 76% | 10 km/h |
| December | 31°C | 24°C | 14°C / 39°C | 71 mm | 80% | 9 km/h |
Best time to visit Castanhal
The most comfortable time to visit Castanhal is generally July to September, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around April, totalling about 1301 mm a year.
Travellers who prefer heat should aim for October, when highs average 33°C. April is the month to avoid if rain would spoil your plans — it averages 296 mm, roughly 12× the rainfall of September.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Castanhal forecast for what is happening now.