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Quick Answer

Tomorrow (August 28, 2026) in São Paulo, expect overcast conditions with temperatures ranging from +15°C to +23°C. Wind will be light at around 3 km/h, and fog is possible, particularly during the morning and evening hours.

Humidity will be high at approximately 88%, making the air feel damp throughout the day.

Key Facts

• Temperature range: +15°C to +23°C, with the low occurring overnight and the high in the mid-afternoon
• Cloud cover: Overcast for most of the day, with limited direct sunlight
• Wind: Light, approximately 3 km/h from easterly and southerly directions depending on the time of day
• Fog: Possible in the morning and evening, with visibility potentially reduced in low-lying areas
• Humidity: Around 88%, contributing to a damp and heavy feel in the air
• Precipitation: Minimal or no significant rainfall expected during the daytime hours
• The forecast reflects typical late-winter conditions in the Southern Hemisphere, where São Paulo is located

Why São Paulo's Winter Weather Defies Expectations

São Paulo sits at roughly 760 meters above sea level, which is a detail many visitors overlook when packing for a trip to Brazil. The city's elevation, combined with its proximity to the Atlantic Ocean and the Serra do Mar mountain range, creates a microclimate that behaves nothing like the tropical image most people associate with the country.

August is the tail end of the Southern Hemisphere winter, and while Rio de Janeiro might be basking in 28°C sunshine, São Paulo can just as easily be wrapped in fog with temperatures struggling to reach 20°C. The forecast for tomorrow fits this pattern perfectly.

The city is expected to see a temperature range of +15°C to +23°C, which is a swing of 8 degrees — not dramatic by most standards, but noticeable for anyone who has to dress for a full day outside. The overcast sky will act as a thermal blanket, preventing the temperature from dropping too sharply at night while also keeping the afternoon from getting too warm.

This is why the city's winter mornings often start with fog that burns off slowly, if at all, when the cloud cover stays thick. The light wind at 3 km/h is another characteristic feature of São Paulo's winter weather.

During the summer months, the city can experience strong gusts, especially before afternoon thunderstorms. In winter, however, the air tends to be more stagnant.

A wind speed of 3 km/h is barely perceptible — it's the kind of breeze that moves leaves slightly but doesn't provide much relief from humidity. For context, a typical walking pace generates a perceived wind of about 5 km/h.

So tomorrow's wind will feel almost nonexistent. The humidity reading of 88% is the number that deserves the most attention.

Combined with temperatures in the mid-to-high teens, this level of moisture in the air can make 16°C feel colder than the thermometer suggests. The perceived temperature of +16°C matches the actual temperature in the forecast, which indicates that the humidity is not quite high enough to create a significant wind-chill or heat-index effect.

Still, for anyone planning outdoor activities, the dampness will be noticeable, particularly in the morning when the fog is likely to be at its thickest.

What the Day-by-Day Pattern Tells Us About the Week Ahead

Looking at the broader forecast for the week, a clear warming trend is visible. The daily highs progress from the mid-20s early in the week to the low 30s by the weekend.

This is a classic late-winter pattern in São Paulo, where the final weeks of August often deliver a taste of the spring weather that officially begins in late September. The overnight lows tell a similar story.

The forecast shows minimum temperatures climbing from around 16°C to 18°C over the next several days. For residents, this is the signal that the coldest nights of the year are behind them.

For visitors, it means that packing a heavy winter coat is probably unnecessary — a light jacket or sweater will be sufficient for the mornings and evenings. The transition from overcast, foggy conditions to clearer, warmer weather is driven by a gradual shift in atmospheric pressure.

As the high-pressure system that has been sitting over the region begins to move eastward, it allows warmer air from the interior of the continent to flow in. This is the same mechanism that produces São Paulo's famous "veranico" — a brief period of summer-like weather that interrupts the winter pattern, usually lasting three to five days.

What's notable about this week's forecast is the absence of significant rainfall. The precipitation probability sits at zero to ten percent, which means any rain that does fall will be light drizzle at most.

This is good news for anyone with outdoor plans, but it also means the air will stay dry in terms of actual precipitation even as the humidity remains high. The fog that's expected tomorrow is a different phenomenon — it forms when moist air near the ground cools to its dew point, creating tiny water droplets suspended in the air.

Unlike rain, fog doesn't necessarily mean wet ground; it's more of a visibility issue than a precipitation event.

How to Plan Your Day in São Paulo With This Forecast

Morning Hours Fog and Cool Temperatures

The morning will start on the cooler end of the spectrum, with temperatures around +15°C to +16°C. If the fog materializes as expected, visibility could be reduced, especially in neighborhoods at higher elevations or near green spaces like Ibirapuera Park.

Drivers should exercise caution on the city's elevated roadways, where fog can be denser than at street level. For those commuting to work or school, the fog is unlikely to cause major disruptions.

São Paulo's public transportation system operates regardless of visibility conditions. However, anyone with early-morning flights should account for potential delays at Congonhas Airport, which is located in a part of the city that frequently experiences dense fog during winter mornings.

Guarulhos International Airport, located further from the city center, generally experiences less fog but is not immune to it.

Midday The Warmest Window

Temperatures will climb gradually through the morning, reaching their peak around 2:00 to 3:00 PM. The +23°C high will feel pleasant, especially if the cloud cover breaks slightly to allow some filtered sunlight through.

The perceived temperature of +16°C in the early part of the day will rise as the actual temperature climbs, and by mid-afternoon, it should feel comfortable for short-sleeved shirts or light layers. This is the best window for outdoor activities.

A walk through Parque Ibirapuera, a visit to the Mercado Municipal, or a stroll through the Jardins neighborhood will all be manageable without heavy clothing. The light wind at 3 km/h won't interfere with outdoor dining or photography.

Evening Cooling Down With Possible Fog

As the sun sets, temperatures will begin their descent back toward the overnight low of +15°C. The fog is expected to return during the evening hours, particularly after 9:00 PM.

Anyone planning late-night activities should bring a light jacket and be prepared for reduced visibility on the roads. The fog's return in the evening is a classic pattern in São Paulo's winter.

The ground cools quickly after sunset, and the moist air near the surface condenses into fog. This process is accelerated by the lack of wind — with air movement at just 3 km/h, there's nothing to disperse the fog once it forms.

What to Wear

The 8-degree temperature swing between the overnight low and the afternoon high creates a layering challenge. The practical approach is to start the day with a light sweater or jacket over a long-sleeved shirt, then shed the outer layer during the warmest part of the afternoon.

A thin scarf can serve double duty — keeping the neck warm in the morning fog and protecting against the slight chill of the evening. For footwear, waterproof shoes are worth considering.

The 88% humidity means surfaces will be damp, even if it doesn't rain. Sidewalks and walkways in shaded areas may retain moisture well into the afternoon.

Regional Variations Within São Paulo

São Paulo is a vast metropolis, and weather conditions can vary noticeably between different districts. The reference forecast data applies to the city center, but residents and visitors should be aware of localized differences.

Higher Elevation Areas

Neighborhoods like Jardins, Pinheiros, and parts of the Zona Sul sit at elevations above the city center. These areas tend to be cooler and foggier, especially in the morning.

Temperatures in these districts could run 1-2 degrees cooler than the city-center forecast, and fog may take longer to dissipate.

The Marginal Tietê and River Valleys

Areas along the Tietê River, including the Marginal Tietê highway corridor, are prone to denser fog formation due to the combination of river moisture and cooler nighttime temperatures. Visibility issues are more likely in these areas during the early morning commute.

Western and Eastern Zones

The western zone of the city, including districts like Butantã and Morumbi, tends to be slightly warmer than the eastern zone, which is more exposed to the cooler Atlantic air masses. The eastern zone, including districts like Tatuapé and Itaquera, may see temperatures at the lower end of the forecast range.

Frequently Asked Questions

Is the +23°C high temperature accurate for São Paulo in August?

Yes, this is consistent with typical late-winter conditions in São Paulo. August is the transition month between the cooler winter and the warmer spring.

While the city can experience days where the high stays below 20°C, it's also common to see highs in the low 20s during the final weeks of winter. The key factor is the cloud cover — overcast days tend to have lower highs, while clear days can push temperatures higher.

Why does the perceived temperature match the actual temperature if humidity is 88%?

The perceived temperature calculation accounts for multiple factors, including humidity, wind speed, and solar radiation. At 88% humidity with a temperature of +16°C and a wind speed of 3 km/h, the conditions are close enough to neutral that the perceived temperature matches the actual reading.

The humidity effect becomes more pronounced at higher temperatures, where high moisture content makes the air feel warmer than it actually is.

Should visitors be concerned about the fog affecting their travel plans?

For most activities, no. The fog expected tomorrow is moderate, not the dense kind that brings traffic to a standstill.

However, travelers with early flights out of Congonhas Airport should check with their airline for potential delays. Fog at Congonhas is a known issue during winter mornings, and airlines operating from this airport have experience managing these conditions.

If your flight is scheduled before 10:00 AM, consider arriving a bit earlier than usual.

Is the temperature forecast likely to change between now and tomorrow?

Forecasts within 24 hours of the date in question are generally reliable, but they can shift slightly. The reference data shows a high degree of agreement among different weather services regarding the temperature range of +15°C to +23°C.

The most uncertain element is the fog — its timing and intensity can vary based on small changes in wind direction and cloud cover. Checking the forecast again in the evening for any updates is a reasonable practice.

What does the +15°C overnight low mean for the rest of the week?

The overnight lows are expected to climb over the coming days, reaching around +18°C by the weekend. This indicates a warming trend that will bring daytime highs into the high 20s or low 30s.

For anyone in São Paulo for an extended stay, this means progressively warmer weather is on the way, and the coldest nights of this winter period are likely behind us.

Reference Notes

Information in this article is based on publicly available sources. Some details may change over time.

Verify with official sources before acting. The forecast data referenced includes temperature ranges, wind speed, humidity, and precipitation probability for São Paulo as provided by multiple weather services.

The comparison of conditions across different city districts is based on general knowledge of São Paulo's geography and microclimate patterns rather than specific forecast data for those individual areas.