As Europe recovers from an exceptional heatwave and meteorologists continue to monitor the potential for more heat, the PET map helps cities identify heat stress before it becomes a public health emergency.
Heatwaves are among Europe's most significant weather hazards, affecting millions of people as well as infrastructure, agriculture, and energy systems. But what actually causes a heatwave? Why do some persist for days or even weeks? And how do meteorologists forecast them?
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Icon
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°F
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83°
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80°
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79°
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78°
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77°
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76°
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74°
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73°
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°F
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83°
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80°
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79°
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77°
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75°
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73°
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72°
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71°
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WNW |
NW |
NW |
NW |
NNW |
NW |
NW |
WNW |
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mph
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11-20
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9-16
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8-13
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9-15
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10-18
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10-18
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8-13
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7-12
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in
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-
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-
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-
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< 0.04
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< 0.04
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-
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-
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%
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0%
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0%
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0%
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0%
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65%
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65%
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5%
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5%
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in
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12.4 mi
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Overnight into Wednesday a few clouds are expected, and some more clouds roll across in the morning. In the afternoon there is a chance of thunderstorms and local showers. The sun will not be visible. Temperature highs are likely to reach 85 °F. The UV-Index climbs up to 7, don't forget to use sunscreen when spending the day outside. The whole day a gentle breeze is expected (8 to 12 mph). Gusts to 21 mph are possible. Winds blowing overnight from West and by day from Northwest. The weather forecast for Downtown Toronto for Wednesday can be accurate in parts but deviations are expected. Check again for latest updates.
Pressure: 1013 hPa
Timezone: EDT (UTC -04:00h)
The location marker is placed on Downtown Toronto. This animation shows the precipitation radar for the selected time range, as well as a 2h forecast. Orange crosses indicate lightning. Data provided by nowcast.de (available in USA, Europe, Australia). Drizzle or light snow fall might be invisible for the radar. Precipitation intensity is colour coded, ranging from turquoise to red.
You can embed this meteogram into your own website. Customize it here.
The real-time satellite image combines visible light during daytime with infrared radiation during nighttime. At night, the image is not dark as infrared radiation can detect temperature differences. Unfortunately, low clouds and fog are difficult to distinguish from ground temperatures and thus can be almost invisible during the night. Meteosat satellite images for Europe are updated in real-time every 5 minutes. GOES-16/GOES-17 (North & South America) and Himawari (Asia) images update every 10 minutes.
Precipitation is estimated from radar and satellites. Precipitation estimates from satellites are less accurate at night than during daytime.
© 2026 meteoblue, NOAA Satellites GOES-16 and EUMETSAT. Lightning data provided by nowcast.
As Europe recovers from an exceptional heatwave and meteorologists continue to monitor the potential for more heat, the PET map helps cities identify heat stress before it becomes a public health emergency.
Heatwaves are among Europe's most significant weather hazards, affecting millions of people as well as infrastructure, agriculture, and energy systems. But what actually causes a heatwave? Why do some persist for days or even weeks? And how do meteorologists forecast them?
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Milton 
Lockport 
