September 2025 Weather Forecast: Heat Waves & 40°C Temperatures
Okay,here’s a breakdown of the key information from the provided text,organized for clarity:
1. Temperature Outlook (Portugal & Europe):
Portugal & Western Europe: La Niña suggests a tendency for milder (mild and dry) autumns.
Northern & Eastern Europe: Cooler temperatures are expected.
Global Temperatures: After 3 months below the 1.5°C pre-industrial average, September is showing a trend back above that limit (currently exceeded by ~0.1°C,potentially up to 0.5°C due to La Niña’s ending influence).
Heatwaves: there’s a possibility of a return to temperatures over 40°C and potential heatwaves. The text suggests this is a forecast for September 2025. (Note the date in the image alt text). Probability of High Temperatures: There’s a 75% probability of maximum temperatures exceeding 35°C for half of the month (based on Ensemble GEFS data – see image).
2. La Niña & Global Climate:
La niña is back: The East Equatorial Pacific has cooled after a period of neutrality. This is expected to continue through fall and winter. La niña’s Impact: La Niña generally contributes to warmer global temperatures (by up to 0.5°C, according to studies).
3. North American Outlook:
Complex Relationship: The connection between La Niña and North American weather is not straightforward.
Potential Trends: Warmer conditions in the west, and occasional cold air outbreaks (“polar raids”) in the east, potentially leading to storms.
4.Tropical Activity (hurricanes/Cyclones):
Current Calm: Tropical activity is predicted to remain relatively calm through the last week of September.
Potential Increase Later: The ECMWF (European Center for Medium-Range Weather Forecasts) is predicting an increase in hurricane activity at the end of the month. This could start a more active phase, though hopefully not a particularly strong one.
Recent Trend: Unlike previous years, the expectation is not for 2-4 active cyclones simultaneously until after September 20th.
Caution: Even a single cyclone can cause important problems, so monitoring is crucial.
5.End of Month Atmospheric Shift:
There are signs of a potential shift in atmospheric patterns at the end of the month that could substantially impact the Northern hemisphere.
Vital Note: The text includes a date of “September 2025” in the alt text of one of the images. This suggests the forecast is for September 2025, not the current year.