Imperatriz climate
Imperatriz (Maranhão, Brazil) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 28 °C82 °F, and about 1,315 mm52 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Imperatriz climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3086 | 2373 | 2780 | 1967.7 |
| Feb | 3085 | 2373 | 2679 | 2278.9 |
| Mar | 3085 | 2373 | 2679 | 2339.2 |
| Apr | 3086 | 2373 | 2680 | 1857.3 |
| May | 3187 | 2373 | 2780 | 843.3 |
| Jun | 3289 | 2271 | 2780 | 150.6 |
| Jul | 3493 | 2271 | 2882 | 70.3 |
| Aug | 3697 | 2373 | 2985 | 80.3 |
| Sep | 3799 | 2576 | 3188 | 311.2 |
| Oct | 3697 | 2577 | 3187 | 662.6 |
| Nov | 3493 | 2476 | 2985 | 1084.2 |
| Dec | 3289 | 2475 | 2882 | 1546.1 |
| Year | 3799 | 2271 | 2882 | 1,31552 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 82% | 81% | 4.9 | 12:24 |
| Feb | 85% | 83% | 4.9 | 12:17 |
| Mar | 86% | 84% | 5.0 | 12:09 |
| Apr | 85% | 77% | 5.0 | 11:59 |
| May | 83% | 57% | 5.1 | 11:52 |
| Jun | 73% | 32% | 5.4 | 11:48 |
| Jul | 63% | 24% | 5.7 | 11:50 |
| Aug | 52% | 29% | 6.0 | 11:56 |
| Sep | 49% | 44% | 5.8 | 12:05 |
| Oct | 57% | 63% | 5.3 | 12:14 |
| Nov | 68% | 73% | 5.0 | 12:22 |
| Dec | 76% | 77% | 4.9 | 12:26 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Imperatriz is like
The warmest month is September, with an average high of 37 °C99 °F and a low of 25 °C76 °F. The coldest is February, when highs average 30 °C85 °F and lows 23 °C73 °F. Seasonal differences are small — just 4.9 °C8.8 °F between the warmest and the coolest month.
It is wet, with about 1,315 mm52 in of precipitation per year. The wettest three-month stretch is January–March, which brings 50% of the annual total. Months with less than 20 mm0.8 in on average: June–August. The wettest month is March (233 mm9.2 in), the driest is July (7 mm0.3 in).
Relative humidity ranges from 49% in September to 86% in March. The clearest skies (lowest average cloud amount, 24%) are typical of July. Average wind speed near the ground ranges from 4 km/h (3 mph) in March to 8 km/h (5 mph) in September.
Best time to visit Imperatriz
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June: average highs of 32 °C89 °F to 32 °C89 °F with 15 mm0.6 in to 15 mm0.6 in of precipitation per month.
The most challenging month is March, which is very wet (233 mm9.2 in) and humid (86% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Imperatriz
- Wetter months (December–April) — highs 3085 to 32 °C89 °F, lows 2373 to 24 °C75 °F, about 199 mm7.8 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Drier months (May–November) — highs 3187 to 37 °C99 °F, lows 2271 to 25 °C77 °F, about 46 mm1.8 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Imperatriz compares
Compared with Marabá, about 182 km to the west, Imperatriz has practically the same average temperature and receives 16% less precipitation (1,315 mm52 in vs 1,569 mm62 in). The difference is largest in June (0.8 °C1.4 °F warmer).
Of the 223 places in Brazil covered by World Climates, Imperatriz is the 10th warmest by annual mean temperature and the 109th wettest by annual precipitation. See all of them on the Brazil climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Phnom Penh (Cambodia, Aw), Takeo (Cambodia, Aw) and Tân Châu (Vietnam, Aw).
Nearby places
- Açailândia 64 km · 27 °C80 °F · 1,392 mm55 in
- Marabá 182 km · 28 °C82 °F · 1,569 mm62 in
- Araguaína 201 km · 27 °C81 °F · 1,486 mm58 in
- Parauapebas 273 km · 27 °C81 °F · 1,531 mm60 in
- Balsas 275 km · 28 °C82 °F · 1,207 mm48 in
- Paragominas 282 km · 27 °C80 °F · 1,799 mm71 in
- Tucuruí 312 km · 27 °C81 °F · 1,902 mm75 in
- Bacabal 333 km · 28 °C82 °F · 1,513 mm60 in
Frequently asked questions
What is the warmest month in Imperatriz?
September is the warmest month in Imperatriz, with an average high of 37 °C (99 °F) and an average low of 25 °C (76 °F).
What is the coldest month in Imperatriz?
February is the coldest month, with an average high of 30 °C (85 °F) and an average low of 23 °C (73 °F).
When does it rain the most in Imperatriz?
March is the wettest month with about 233 mm (9.2 in) of precipitation; July is the driest with about 7 mm (0.3 in).
What is the best time to visit Imperatriz?
Judging by long-term averages, the most comfortable months are June.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.