Climate averages 1991–2020
Santarém weather
in September.
A hot, moderately wet month: the 2nd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Santarém: daytime highs average 31.2°C and nights cool to about 26.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 68 mm of rain on roughly 11 days, which makes September a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 06 min on an average September day.
The nearest other city in this atlas is Oriximiná (149 km away). In September its highs average 31.9°C, 0.8°C warmer than Santarém, with 71 mm of rain.
Among the 448 cities listed in Brazil, Santarém ranks joint 88th of 448 for the warmest September highs and joint 247th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Santarém is 3.6°C warmer than that mean.
From September to October, average highs rise by 0.2°C to 31.4°C, and monthly rainfall rises from 68 mm to 107 mm.
The annual picture
September 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
Santarém climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.6°C24.7°C | 24.7°C | 409 | 28.2 | 12.212 h |
| February | 28.3°C24.5°C | 24.5°C | 391 | 26.1 | 12.212 h |
| March | 28.3°C24.5°C | 24.5°C | 488 | 29.3 | 12.112 h |
| April | 28.2°C24.5°C | 24.5°C | 450 | 29.2 | 12.112 h |
| May | 28.3°C24.6°C | 24.6°C | 365 | 29.6 | 12.012 h |
| June | 28.5°C24.8°C | 24.8°C | 187 | 24.8 | 12.012 h |
| July | 28.9°C25.0°C | 25.0°C | 114 | 19.2 | 12.012 h |
| August | 30.2°C25.7°C | 25.7°C | 74 | 13.0 | 12.012 h |
| September, selected | 31.2°C26.2°C | 26.2°C | 68 | 10.5 | 12.112 h |
| October | 31.4°C26.5°C | 26.5°C | 107 | 11.9 | 12.212 h |
| November | 30.7°C26.2°C | 26.2°C | 149 | 16.6 | 12.212 h |
| December | 29.9°C25.7°C | 25.7°C | 233 | 21.7 | 12.312 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
September in nearby cities
- Oriximiná in SeptemberBrazil · 149 kmHigh 31.9°C · Low 25.5°C · 71 mm rain
- Parintins in SeptemberBrazil · 226 kmHigh 31.7°C · Low 24.9°C · 94 mm rain
- Itaituba in SeptemberBrazil · 248 kmHigh 32.9°C · Low 24.1°C · 78 mm rain
- Altamira in SeptemberBrazil · 290 kmHigh 33.1°C · Low 24.2°C · 34 mm rain
- Itacoatiara in SeptemberBrazil · 422 kmHigh 31.2°C · Low 25.2°C · 109 mm rain
- Santana in SeptemberBrazil · 475 kmHigh 31.5°C · Low 24.7°C · 24 mm rain
- Breves in SeptemberBrazil · 477 kmHigh 33.4°C · Low 24.5°C · 25 mm rain
- Macapá in SeptemberBrazil · 490 kmHigh 31.2°C · Low 24.8°C · 26 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 Santarém) is explained once on the Santarém year overview and on the Sources, method and limits page.