Grajaú, Brazil Climate
The warmest month is September, with an average high of 37°C; the coldest is June, with an average low of 21°C. A normal year brings 1081 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 24
- Normal high
- 37°C
- Normal low
- 25°C
- Reanalysis high
- 40°Cin 2020
- Reanalysis low
- 21°Cin 2006
- Chance of a wet day
- 19%
- Daylight
- 12 h 07 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 30°C | 22°C | 37°C (1992) | 19°C (2014) | 183 mm | 24.8 |
| February | 30°C | 22°C | 38°C (2016) | 19°C (1997) | 170 mm | 22.6 |
| March | 29°C | 22°C | 36°C (2005) | 19°C (1998) | 189 mm | 24.8 |
| April | 30°C | 22°C | 37°C (1998) | 19°C (2001) | 141 mm | 21.0 |
| May | 31°C | 22°C | 38°C (1998) | 18°C (2000) | 71 mm | 12.4 |
| June | 33°C | 21°C | 38°C (2015) | 16°C (2008) | 12 mm | 3.0 |
| July | 34°C | 21°C | 39°C (1998) | 16°C (1996) | 6 mm | 0.0 |
| August | 36°C | 22°C | 41°C (2016) | 17°C (2006) | 6 mm | 0.0 |
| September | 37°C | 24°C | 41°C (2015) | 19°C (2006) | 24 mm | 3.0 |
| October | 37°C | 25°C | 42°C (2015) | 19°C (1999) | 59 mm | 9.3 |
| November | 34°C | 24°C | 42°C (2015) | 19°C (1998) | 93 mm | 15.0 |
| December | 32°C | 23°C | 41°C (2015) | 19°C (1991) | 127 mm | 18.6 |
| Year | 33°C | 23°C | 1081 mm | 155 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1081 mm in a normal year, most in March.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Grajaú.
The muggiest month is January, when 100 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 22°C | 81% | 0% | 0% | 0% | 16% | 84% | 0% |
| February | 22°C | 84% | 0% | 0% | 0% | 5% | 95% | 0% |
| March | 23°C | 85% | 0% | 0% | 0% | 1% | 98% | 0% |
| April | 23°C | 85% | 0% | 0% | 0% | 3% | 96% | 1% |
| May | 22°C | 80% | 0% | 0% | 1% | 24% | 75% | 0% |
| June | 19°C | 68% | 1% | 9% | 21% | 51% | 18% | 0% |
| July | 16°C | 56% | 10% | 28% | 33% | 26% | 2% | 0% |
| August | 15°C | 46% | 26% | 38% | 22% | 12% | 0% | 0% |
| September | 16°C | 45% | 15% | 32% | 35% | 16% | 2% | 0% |
| October | 18°C | 52% | 2% | 13% | 33% | 38% | 14% | 0% |
| November | 20°C | 64% | 0% | 1% | 12% | 48% | 39% | 0% |
| December | 21°C | 72% | 0% | 0% | 3% | 36% | 61% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is July, with the sky 26 percent covered on average; the cloudiest is March, at 82 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is August, averaging 14.0 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jan 1, with 12 h 28 min of daylight; the shortest is Jun 7, with 11 h 47 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Grajaú in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.