What changed & when
Onset through peak
Baseline 2026-09-24 · onset 2026-10-08 · peak 2026-10-08 · latest 2026-10-08. Thermal heatwave anomaly (+54% above 30d baseline).
São Paulo, Brazil
12 Million Citizens· Americas Metropolitan Baseline1 Noticeable Anomaly: Thermal heatwave anomaly (+54% above 30d baseline)1/p = 100 in ~30 daily samples · p=0.0002Statistical flag plus WHO guideline exceedance
Gemini AI Synthesis & Plain-Language Summary
In plain English: São Paulo is 54% above its 30-day Temperature baseline (29.1 vs 18.9). Unusual does not automatically mean unsafe; this is a statistical departure from recent local weather, not an emergency siren.
Gemini may only interpret numbers already on this page. Chart annotations below are computed from the dated series (onset, peak, duration, latest vs baseline). Hypotheses are labeled and are not verified causes.
Conversational Telemetry Questions (8 Indicators)
Open-Meteo · CAMS · NASA FIRMS · click a chart for 30/60/90-day investigationWHO 24h guideline: 15 µg/m³. EPA band: Moderate. 30-day baseline 18 µg/m³. Statistical anomaly: no. CAMS ozone on this page is 229 µg/m³ CAMS O₃ (mass concentration, not station AQI). · Click for dated trend
30-day baseline 18.9°C · q=0.0333 · Click for dated trend
High today: 29.1°C. 30-day baseline 18.9°C. · Click for dated trend
Dry spell does not automatically mean drought. Baseline 8.2 mm. · Click for dated trend
Wind helps disperse ground-level pollutants. Click for the humidity trend versus other atmospheric measurements. · Click for dated trend
Sun protection recommended during midday hours.
Standard clear atmospheric line of sight.
Is soil moisture balanced?Root Zone
31%Saturation
Optimal range for local urban vegetation.
See This Change From Space
Travel through satellite observations to discover how this area has changed.
2026-10-08
Temperature 29.1 °C · MODIS land surface temperature (day)
Current · T−1 · T−7 · T−14 · T−30 · NASA GIBS · five snapshots, not a 90-day scrub
Magnitude & spatial extent
Not measured yet
Open the What changed tab to compare baseline and peak pixels. This is a visual aid, not a land-cover map.
Scientific uncertainty
Unusual ≠ unsafe
NASA GIBS true-color is typically about one UTC day behind. Clouds, smoke, and missing tiles can hide the surface; they are not evidence that conditions are typical or safe. Pixel differencing is an unvalidated visual comparison (fixed 15% RGB delta and a brightness cloud heuristic). It is not environmental detection. Onset and peak dates come from the city's modeled Open-Meteo / CAMS series, not from the satellite pixels.
Observed: São Paulo has an active heat statistical flag (Thermal heatwave anomaly (+54% above 30d baseline)). Satellite lookback compares a pre-onset baseline on 2026-09-24 with peak 2026-10-08 and latest 2026-10-08. NASA GIBS layer: MODIS_Terra_Land_Surface_Temp_Day. Unusual ≠ unsafe — a radar flag is not a health classification, and a visual delta is not a verified land-cover change product.
In the local news · Ground-Truthing via SerpApi
Real-time web corroborationIQAirIQAirNature
Sao Bernardo do Campo Air Quality Index (AQI) and Brazil Air Pollution
06/23/2026, 10:17 AM, +0000 UTC
Sao Jose do Rio Preto Air Quality Index (AQI) and Brazil Air Pollution
06/24/2026, 11:05 AM, +0000 UTC
Modifying effects of PM2.5 and O3 on heat-related cardiorespiratory hospitalizations in Brazil | Scientific Reports
10/10/2025, 07:00 AM, +0000 UTC
Modeled weather: Open-Meteo (ECMWF IFS / GFS blend). Modeled air: Open-Meteo Air Quality (Copernicus CAMS). Observed fire: NASA FIRMS VIIRS 375 m. Observation 2026-10-08T00:00:00Z. Pillar Thermal Heatwave.