São Luís in August
In August, São Luís averages 31°C (88°F) during the day and 25°C (77°F) at night, with frequent rain — about 27 days of the month see precipitation (39 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
August is one of the wetter and less comfortable months in São Luís. If your dates are flexible, consider a different time of year.
How August compares to the rest of the year in São Luís
August is in the middle of the year for warmth in São Luís (4th of 12) and moderately rainy compared to the rest of the year (8th of 12). Daytime temperature runs 1°C above the annual average (30°C). August runs 1°C warmer than July (30°C) and warms a further 1°C into September (32°C).
August sunrise & sunset in São Luís
Times shown for São Luís local time (America/Fortaleza), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in São Luís — August
Golden-hour and blue-hour windows for the 15th of August, in São Luís's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — São Luís in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (Shoulder) and São Luís's popularity.
Crowds & pricing — August in São Luís
São Luís is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — August in São Luís
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
São Luís in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 30°C / 85°F | 25°C / 76°F | 238 mm | 30 | — |
| February | 29°C / 84°F | 24°C / 76°F | 327 mm | 28 | — |
| March | 29°C / 84°F | 24°C / 75°F | 473 mm | 31 | — |
| April | 29°C / 85°F | 24°C / 76°F | 370 mm | 30 | — |
| May | 30°C / 85°F | 24°C / 76°F | 249 mm | 31 | — |
| June | 30°C / 85°F | 24°C / 76°F | 126 mm | 29 | — |
| July | 30°C / 86°F | 24°C / 76°F | 74 mm | 29 | — |
| August | 31°C / 88°F | 25°C / 77°F | 39 mm | 27 | — |
| September | 32°C / 89°F | 25°C / 78°F | 29 mm | 25 | — |
| October | 32°C / 89°F | 26°C / 78°F | 33 mm | 23 | — |
| November | 32°C / 89°F | 26°C / 78°F | 73 mm | 22 | — |
| December | 31°C / 88°F | 26°C / 78°F | 117 mm | 26 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for São Luís in August →
Frequently asked questions
How hot is São Luís in August?
In August, São Luís averages a high of 31°C (88°F) and a low of 25°C (77°F) — generally hot.
Does it rain a lot in São Luís in August?
August is quite rainy in São Luís, with about 27 rainy days on average.
Is August a good time to visit São Luís?
August is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for São Luís in August?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full August packing list for São Luís for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.