Climate averages 1991–2020
Castanhal weather
in January.
A hot, very wet month: the 7th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Castanhal: daytime highs average 29.8°C and nights cool to about 23.3°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 269 mm of rain on roughly 27 days, which makes January a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average January day.
The nearest other city in this atlas is Santa Isabel do Pará (26 km away). In January its highs average 29.6°C, about as warm as Castanhal, with 306 mm of rain.
Among the 448 cities listed in Brazil, Castanhal ranks joint 97th of 448 for the warmest January highs and 358th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Castanhal is 1.3°C warmer than that mean.
From January to February, average highs fall by 0.8°C to 29.0°C, and monthly rainfall rises from 269 mm to 357 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Santa Isabel do Pará in JanuaryBrazil · 26 kmHigh 29.6°C · Low 23.4°C · 306 mm rain
- Marituba in JanuaryBrazil · 47 kmHigh 29.8°C · Low 23.8°C · 306 mm rain
- Ananindeua in JanuaryBrazil · 50 kmHigh 29.5°C · Low 24.0°C · 306 mm rain
- Belém in JanuaryBrazil · 67 kmHigh 29.1°C · Low 24.3°C · 232 mm rain
- Barcarena in JanuaryBrazil · 81 kmHigh 29.0°C · Low 24.3°C · 228 mm rain
- Capanema in JanuaryBrazil · 84 kmHigh 29.7°C · Low 23.5°C · 221 mm rain
- Moju in JanuaryBrazil · 114 kmHigh 30.0°C · Low 23.4°C · 285 mm rain
- Abaetetuba in JanuaryBrazil · 116 kmHigh 29.4°C · Low 24.1°C · 235 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.