Parnaíba climate
Parnaíba (Piauí, Brazil) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 28 °C82 °F, and about 1,102 mm43 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Parnaíba climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3188 | 2475 | 2882 | 1465.7 |
| Feb | 3086 | 2475 | 2781 | 1987.8 |
| Mar | 2985 | 2475 | 2780 | 2409.5 |
| Apr | 2985 | 2475 | 2780 | 2409.5 |
| May | 3086 | 2475 | 2781 | 1345.3 |
| Jun | 3188 | 2373 | 2781 | 562.2 |
| Jul | 3391 | 2373 | 2882 | 361.4 |
| Aug | 3594 | 2373 | 2984 | 70.3 |
| Sep | 3596 | 2374 | 2985 | 40.2 |
| Oct | 3596 | 2475 | 3085 | 50.2 |
| Nov | 3595 | 2475 | 3085 | 70.3 |
| Dec | 3493 | 2476 | 2984 | 291.1 |
| Year | 3596 | 2373 | 2882 | 1,10243 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 71% | 5.6 | 12:16 |
| Feb | 84% | 79% | 5.2 | 12:12 |
| Mar | 86% | 82% | 5.2 | 12:08 |
| Apr | 88% | 82% | 5.0 | 12:03 |
| May | 85% | 64% | 5.3 | 11:59 |
| Jun | 78% | 47% | 5.5 | 11:57 |
| Jul | 72% | 38% | 5.8 | 11:58 |
| Aug | 65% | 25% | 6.4 | 12:01 |
| Sep | 62% | 23% | 6.8 | 12:06 |
| Oct | 62% | 33% | 6.8 | 12:11 |
| Nov | 64% | 43% | 6.6 | 12:15 |
| Dec | 68% | 56% | 6.1 | 12:17 |
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 Parnaíba is like
The warmest month is October, with an average high of 35 °C96 °F and a low of 24 °C75 °F. The coldest is April, when highs average 29 °C85 °F and lows 24 °C75 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.9 °C5.3 °F.
It is wet, with about 1,102 mm43 in of precipitation per year. The wettest three-month stretch is February–April, which brings 62% of the annual total. Months with less than 20 mm0.8 in on average: August–November. The wettest month is March (240 mm9.5 in), the driest is September (4 mm0.2 in).
Relative humidity ranges from 62% in September to 88% in April. The clearest skies (lowest average cloud amount, 23%) are typical of September. Average wind speed near the ground ranges from 8 km/h (5 mph) in April to 17 km/h (10 mph) in October.
Best time to visit Parnaíba
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June and July: average highs of 31 °C88 °F to 33 °C91 °F with 36 mm1.4 in to 56 mm2.2 in of precipitation per month.
The most challenging month is April, which is very wet (240 mm9.5 in) and humid (88% 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 Parnaíba
- Wetter months (January–May) — highs 2985 to 31 °C88 °F, lows around 24 °C75 °F, about 192 mm7.5 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 (June–December) — highs 3188 to 35 °C96 °F, lows 2373 to 24 °C76 °F, about 21 mm0.8 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Parnaíba compares
Compared with Sobral, about 181 km to the southeast, Parnaíba has practically the same average temperature and receives 15% more precipitation (1,102 mm43 in vs 958 mm38 in). The difference is largest in June (1 °C1.7 °F warmer).
Of the 223 places in Brazil covered by World Climates, Parnaíba is the 6th warmest by annual mean temperature and the 194th 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: Milagro (Ecuador, Aw), Quevedo (Ecuador, Aw) and Guayaquil (Ecuador, BSh).
Nearby places
- Sobral 181 km · 28 °C82 °F · 958 mm38 in
- Itapipoca 253 km · 27 °C81 °F · 950 mm37 in
- São José de Ribamar 257 km · 27 °C81 °F · 1,511 mm60 in
- Teresina 268 km · 29 °C83 °F · 1,201 mm47 in
- Timon 270 km · 28 °C83 °F · 1,278 mm50 in
- Caxias 279 km · 28 °C83 °F · 1,278 mm50 in
- São Luís 284 km · 27 °C81 °F · 1,717 mm68 in
- Codó 291 km · 28 °C82 °F · 1,381 mm54 in
Frequently asked questions
What is the warmest month in Parnaíba?
October is the warmest month in Parnaíba, with an average high of 35 °C (96 °F) and an average low of 24 °C (75 °F).
What is the coldest month in Parnaíba?
April is the coldest month, with an average high of 29 °C (85 °F) and an average low of 24 °C (75 °F).
When does it rain the most in Parnaíba?
March is the wettest month with about 240 mm (9.5 in) of precipitation; September is the driest with about 4 mm (0.2 in).
What is the best time to visit Parnaíba?
Judging by long-term averages, the most comfortable months are June and July.
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.