Climate averages 1991–2020
São Cristóvão weather
in September.
A warm, moderately wet month: the joint 9th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in São Cristóvão: daytime highs average 26.0°C and nights cool to about 22.3°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 64 mm of rain on roughly 17 days, which makes September a moderately wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average September day.
The nearest other city in this atlas is Aracaju (19 km away). In September its highs average 26.2°C, about as warm as São Cristóvão, with 67 mm of rain.
Among the 448 cities listed in Brazil, São Cristóvão ranks joint 293rd of 448 for the warmest September highs and joint 225th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; São Cristóvão is 1.5°C cooler than that mean.
From September to October, average highs rise by 1.1°C to 27.2°C, and monthly rainfall falls from 64 mm to 52 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
São Cristóvão climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C24.4°C | 24.4°C | 56 | 15.1 | 12.713 h |
| February | 29.0°C24.6°C | 24.6°C | 64 | 16.6 | 12.512 h |
| March | 29.2°C24.7°C | 24.7°C | 71 | 18.1 | 12.212 h |
| April | 28.4°C24.3°C | 24.3°C | 112 | 20.3 | 11.912 h |
| May | 27.2°C23.6°C | 23.6°C | 157 | 22.9 | 11.612 h |
| June | 26.0°C22.7°C | 22.7°C | 148 | 24.0 | 11.511 h |
| July | 25.3°C22.0°C | 22.0°C | 125 | 23.9 | 11.512 h |
| August | 25.2°C21.8°C | 21.8°C | 98 | 22.1 | 11.712 h |
| September, selected | 26.0°C22.3°C | 22.3°C | 64 | 17.2 | 12.012 h |
| October | 27.2°C23.2°C | 23.2°C | 52 | 13.9 | 12.312 h |
| November | 28.1°C23.8°C | 23.8°C | 41 | 11.1 | 12.613 h |
| December | 28.8°C24.3°C | 24.3°C | 33 | 10.1 | 12.813 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
- Aracaju in SeptemberBrazil · 19 kmHigh 26.2°C · Low 22.5°C · 67 mm rain
- Itabaiana in SeptemberBrazil · 44 kmHigh 26.9°C · Low 19.9°C · 43 mm rain
- Lagarto in SeptemberBrazil · 50 kmHigh 27.2°C · Low 20.0°C · 44 mm rain
- Arapiraca in SeptemberBrazil · 152 kmHigh 27.4°C · Low 19.9°C · 29 mm rain
- Alagoinhas in SeptemberBrazil · 182 kmHigh 27.9°C · Low 19.9°C · 37 mm rain
- Serrinha in SeptemberBrazil · 209 kmHigh 28.5°C · Low 18.8°C · 21 mm rain
- Paulo Afonso in SeptemberBrazil · 210 kmHigh 30.4°C · Low 20.0°C · 10 mm rain
- Dias d'Ávila in SeptemberBrazil · 214 kmHigh 27.5°C · Low 20.9°C · 49 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 São Cristóvão) is explained once on the São Cristóvão year overview and on the Sources, method and limits page.