# Extreme heatwaves in Greece and the United States

> Live situation record from CLSTR: https://clstr.news/situations/extreme-heatwaves-in-greece-and-the-united-states
> Updated: 2026-08-24T00:29:41.000Z. Sources: 61. Developments: 2.

Severe heatwaves continue to impact Greece and various regions of the United States. In Greece, temperatures have exceeded 40 degrees Celsius in several areas, with 155 meteorological stations recording at least 37 degrees Celsius. Forecasters warn of a new, intense heat spell arriving around August 28 that could last into early September, increasing the risk of wildfires due to high winds and dryness.

In Greece, the National Meteorological Service (EMY) has issued warnings for high temperatures, noting that 155 out of 580 stations recorded values of 37°C or higher. In Agrinio, temperatures are forecast to hit 40°C. While the Meltemi winds may provide slight reprieve to northern and eastern areas, Western Greece and the Peloponnese are expected to remain under intense heat. Extreme temperature fluctuations were also observed in Crete, where a nearly 29°C difference was recorded between coastal and mountainous areas within a few hours. To mitigate the impact, Athens has made air-conditioned halls available to the public and established water stations for animals.

In the United States, a dangerous heat dome is driving temperatures into triple digits across the Southern Plains, the Lower Mississippi Valley, and the Southwest. The National Weather Service has issued extreme heat warnings and advisories for Louisiana, Mississippi, Oklahoma, Texas, and southern Arkansas. In north-central Texas, including Dallas, temperatures were expected to reach 109 degrees. Additionally, extreme heat warnings remain in effect for parts of Southern California, southern Nevada, and central and southwestern Arizona, where temperatures are expected to exceed 110 degrees.

## Claims

- In Greece, temperatures have exceeded 40 degrees Celsius in several areas, with 155 out of 580 meteorological stations recording temperatures of 37 degrees Celsius or higher. (corroborated by 3 sources)
- Southern California is experiencing a heat wave with temperatures exceeding 100 degrees in the San Fernando, Santa Clarita, and Antelope valleys. (corroborated by 2 sources)
- A heat wave may persist until the early days of September. (corroborated by 2 sources)
- Authorities have warned of a high risk of forest fires due to heat and wind. (corroborated by 2 sources)
- The National Weather Service issued extreme heat warnings and advisories for parts of the Southern United States, including Louisiana, Mississippi, Oklahoma, Texas, and southern Arkansas. (single source)
- Extreme heat warnings were issued for portions of Southern California, southern Nevada, and central and southwestern Arizona. (single source)
- Temperatures in north-central Texas, including Dallas, were expected to reach 109 degrees on Sunday. (single source)
- The heat wave in Southern California has created an elevated wildfire danger. (single source)
- A new heat spell is forecast to arrive in Greece around August 28, potentially lasting into early September. (single source)
- The National Meteorological Service issued a yellow warning for high temperatures in 12 Greek regions. (single source)
- Temperatures in Agrinio are expected to reach 40°C. (single source)

## Timeline

### 2026-08-24: Extreme heat and storms forecast for US regions

Extreme heat and storms are impacting various US regions, including the Alabama Gulf Coast and Santa Barbara, with heat indices reaching triple digits and temperatures rising well above seasonal norms.

2 sources. https://clstr.news/cluster/extreme-heat-and-storms-forecast-for-us-regions

### 2026-08-22: Greece heat wave brings temperatures up to 40°C

Greece is facing its first major summer heat wave, with temperatures reaching 40°C in some areas. Experts warn the heat may persist into early September, increasing forest fire risks across the country.

59 sources. https://clstr.news/cluster/greece-weather-high-temperatures-and-localized-mountain-showers

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Cite as: Extreme heatwaves in Greece and the United States. CLSTR, https://clstr.news/situations/extreme-heatwaves-in-greece-and-the-united-states