Climate averages 1991–2020
Santana de Parnaíba weather
in September.
A warm, moderately wet month: the joint 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Santana de Parnaíba: daytime highs average 25.0°C and nights cool to about 14.8°C. By daytime temperature it is the joint 7th warmest of the 12 months.
Expect about 86 mm of rain on roughly 9 days, which makes September a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 56 min on an average September day.
The nearest other city in this atlas is Barueri (9 km away). In September its highs average 24.8°C, about as warm as Santana de Parnaíba, with 86 mm of rain.
Among the 448 cities listed in Brazil, Santana de Parnaíba ranks joint 337th of 448 for the warmest September highs and joint 312th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Santana de Parnaíba is 2.6°C cooler than that mean.
From September to October, average highs rise by 0.9°C to 25.8°C, and monthly rainfall rises from 86 mm to 114 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
Santana de Parnaíba climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.8°C19.2°C | 19.2°C | 230 | 22.7 | 13.413 h |
| February | 27.1°C19.2°C | 19.2°C | 168 | 19.4 | 12.913 h |
| March | 26.2°C18.5°C | 18.5°C | 136 | 18.5 | 12.212 h |
| April | 25.0°C16.9°C | 16.9°C | 63 | 9.0 | 11.612 h |
| May | 22.4°C14.1°C | 14.1°C | 60 | 7.0 | 11.011 h |
| June | 21.8°C12.8°C | 12.8°C | 48 | 5.1 | 10.711 h |
| July | 21.9°C12.1°C | 12.1°C | 48 | 5.1 | 10.811 h |
| August | 23.5°C12.9°C | 12.9°C | 38 | 4.8 | 11.311 h |
| September, selected | 25.0°C14.8°C | 14.8°C | 86 | 9.2 | 11.912 h |
| October | 25.8°C16.3°C | 16.3°C | 114 | 13.5 | 12.613 h |
| November | 25.5°C16.9°C | 16.9°C | 150 | 16.1 | 13.213 h |
| December | 26.5°C18.4°C | 18.4°C | 181 | 20.5 | 13.514 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
- Barueri in SeptemberBrazil · 9 kmHigh 24.8°C · Low 14.7°C · 86 mm rain
- Osasco in SeptemberBrazil · 16 kmHigh 24.5°C · Low 14.4°C · 84 mm rain
- Caieiras in SeptemberBrazil · 20 kmHigh 24.4°C · Low 14.4°C · 91 mm rain
- Embu das Artes in SeptemberBrazil · 24 kmHigh 24.0°C · Low 14.4°C · 108 mm rain
- Taboão da Serra in SeptemberBrazil · 24 kmHigh 23.7°C · Low 14.1°C · 108 mm rain
- São Roque in SeptemberBrazil · 24 kmHigh 24.6°C · Low 14.6°C · 82 mm rain
- Francisco Morato in SeptemberBrazil · 25 kmHigh 24.7°C · Low 14.3°C · 91 mm rain
- Várzea Paulista in SeptemberBrazil · 27 kmHigh 25.3°C · Low 14.4°C · 91 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 Santana de Parnaíba) is explained once on the Santana de Parnaíba year overview and on the Sources, method and limits page.
Barueri lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.