União Climate by Month
União, Piauí, Brazil
Hot all year, with a rainy season from January to April.
União is hot all year, with a rainy season from January to April. Expect highs of 99°F (37°C) in October and 89°F (32°C) in April, with the coldest nights (July) near 69°F (20°C). It gets 55 in (1405 mm) of rain a year, 75% of it from January to April. August and September are almost completely dry.
- Warmest month
- 99°F(37°C)
- Average high, October
- Coldest nights
- 69°F(20°C)
- Average low, July
- Rain per year
- 55 in(1405 mm)
- Wettest: March
- Humidity
- 67%
- Sunniest: September
Best and worst months in União
Best for weatherJune and July are the best time for weather in União: highs near 91°F (33°C) and about 1.0 in (26 mm) of rain a month.
Least pleasantMarch is the least pleasant month: it's the wettest, with 13 in (342 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
União weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 92°F(33°C) | 73°F(23°C) | 7.2 in(183 mm) | 72% | 4.6 |
| FebFebruary | 90°F(32°C) | 72°F(22°C) | 9.7 in(246 mm) | 75% | 4.5 |
| MarMarch | 89°F(32°C) | 72°F(22°C) | 13 in(342 mm) | 79% | 4.3 |
| AprApril | 89°F(32°C) | 72°F(22°C) | 11 in(282 mm) | 79% | 4.1 |
| MayMay | 90°F(32°C) | 72°F(22°C) | 5.7 in(144 mm) | 75% | 4.5 |
| JunJuneBest | 90°F(32°C) | 70°F(21°C) | 1.1 in(29 mm) | 68% | 4.6 |
| JulJulyBest | 92°F(33°C) | 69°F(20°C) | 0.9 in(22 mm) | 65% | 5.1 |
| AugAugust | 95°F(35°C) | 69°F(21°C) | 0.2 in(5 mm) | 59% | 5.8 |
| SepSeptember | 98°F(37°C) | 72°F(22°C) | 0.3 in(8 mm) | 54% | 5.9 |
| OctOctober | 99°F(37°C) | 74°F(23°C) | 0.7 in(19 mm) | 56% | 5.7 |
| NovNovember | 97°F(36°C) | 74°F(23°C) | 1.9 in(47 mm) | 60% | 5.3 |
| DecDecember | 95°F(35°C) | 74°F(23°C) | 3.1 in(78 mm) | 62% | 4.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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