Climate averages 1991–2020
Castanhal weather
in October.
A hot, fairly dry month: the warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a hot month in Castanhal: daytime highs average 33.1°C and nights cool to about 23.7°C. By daytime temperature it is the warmest month of the year.
Expect about 34 mm of rain on roughly 8 days, which makes October a fairly dry month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average October day.
The nearest other city in this atlas is Santa Isabel do Pará (26 km away). In October its highs average 32.6°C, 0.5°C cooler than Castanhal, with 40 mm of rain.
Among the 448 cities listed in Brazil, Castanhal ranks 38th of 448 for the warmest October highs and joint 80th of 448 for the driest October (rainfall, lowest first). The mean October high of those 448 cities is 28.3°C; Castanhal is 4.9°C warmer than that mean.
From October to November, average highs fall by 0.2°C to 32.9°C, and monthly rainfall rises from 34 mm to 49 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Santa Isabel do Pará in OctoberBrazil · 26 kmHigh 32.6°C · Low 24.0°C · 40 mm rain
- Marituba in OctoberBrazil · 47 kmHigh 32.9°C · Low 24.2°C · 40 mm rain
- Ananindeua in OctoberBrazil · 50 kmHigh 32.5°C · Low 24.4°C · 40 mm rain
- Belém in OctoberBrazil · 67 kmHigh 32.1°C · Low 24.8°C · 27 mm rain
- Barcarena in OctoberBrazil · 81 kmHigh 32.1°C · Low 25.0°C · 20 mm rain
- Capanema in OctoberBrazil · 84 kmHigh 32.6°C · Low 24.0°C · 25 mm rain
- Moju in OctoberBrazil · 114 kmHigh 33.7°C · Low 24.2°C · 35 mm rain
- Abaetetuba in OctoberBrazil · 116 kmHigh 32.7°C · Low 25.0°C · 21 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.