Germany Heatwave 2025: Up to 36°C Forecast and Tropical Nights Expected

Introduction

Germany's national weather service, the Deutscher Wetterdienst (DWD), has issued forecasts for a significant heatwave beginning this Wednesday, with temperatures expected to reach between 25°C and 36°C across the country. Some cities are also forecast to experience tropical nights — where temperatures remain above 20°C overnight — making this one of the more challenging heat events of the 2025 summer season. For expats, particularly those living in older German apartments that lack air conditioning or good insulation against heat, knowing how to prepare and respond is genuinely important this week.

What the DWD Is Forecasting

The Deutscher Wetterdienst is Germany's official meteorological authority, and its warnings carry practical weight — local authorities, emergency services, and public health offices use DWD data to activate their own response plans. Temperatures of 25–36°C are forecast from Wednesday, with the highest peaks likely in western and southwestern Germany. The forecast for tropical nights — a term meaning overnight temperatures that stay at or above 20°C — is particularly relevant in dense urban areas like Frankfurt, Cologne, Stuttgart, and parts of Munich and Berlin.

Tropical nights are medically significant because the body relies on cooler night-time temperatures to recover from daytime heat exposure. When that cooling does not happen, cumulative heat stress builds up over several days, increasing health risks especially for the elderly, young children, and people with chronic health conditions.

How Germany Responds to Heatwaves

Germany does not have the same culture of air conditioning that you might find in the southern United States, the Middle East, or Southeast Asia. Fewer than 5% of German households have fixed air conditioning. As a result, the country's approach to heatwaves is primarily behavioural and public-health focused.

During significant heat events, the DWD publishes tiered heat warnings on its website and WarnWetter app. Local Gesundheitsämter (public health offices) may issue specific advice for vulnerable groups. Some cities operate or announce public cooling spaces — typically in municipal buildings, libraries, or dedicated cooling rooms. These are particularly worth knowing about if you live alone, do not have access to a garden, or are caring for an elderly relative.

Workplace rules also apply: under German occupational health regulations, employers are required to take measures to protect workers from heat, including adjusting working hours, providing cool water, or allowing flexible start times. If you work in an environment that becomes dangerously hot, you have the right to raise this with your employer or Betriebsrat.

Practical Tips for This Week

The most effective steps are straightforward. Keep your apartment cool by closing blinds, shutters, or curtains on sun-facing windows during the day and opening windows at night when temperatures fall. Drink water regularly — aim for 1.5 to 2 litres daily, more if you are active outdoors. Avoid heavy meals and alcohol during the hottest hours.

Plan outdoor activities and exercise for early morning or evening. If you commute by public transport, expect underground U-Bahn lines and buses to be hot and potentially crowded. Carry a refillable water bottle and allow extra time for journeys.

If you or someone near you shows signs of heat exhaustion — pale and sweaty skin, dizziness, nausea, weakness — move to a cool location, drink cool water, and seek medical advice via 116 117. If symptoms escalate to heatstroke — hot dry skin, confusion, loss of consciousness — call 112 immediately.

Frequently Asked Questions

Where can I find official DWD heat warnings for my city?

The DWD provides free, real-time warnings through its website (dwd.de) and the WarnWetter app, available on both iOS and Android. Enter your location to receive warnings specific to your district. The app is in German, but its visual warning system (colour-coded levels) is easy to understand regardless of language level.

Do I have any rights at work during a heatwave in Germany?

Yes. German workplace health and safety regulations (Arbeitsstättenverordnung and associated technical rules) require employers to ensure that indoor workplaces do not become dangerous due to heat. While there is no single legally defined maximum temperature that triggers an automatic right to go home, employers must take action — such as providing fans, cool water, flexible hours, or remote work options — when temperatures in the workplace rise significantly. If you feel your workplace is unsafe, speak to your employer, Betriebsrat, or contact your regional Arbeitsschutzbehörde (occupational safety authority).

Conclusion and Next Steps

This week's heatwave is a practical challenge that affects everyone in Germany, expats included. The key actions are simple: monitor DWD warnings, prepare your home for heat retention, stay hydrated, and know who to call if you or someone you know needs medical help. Germany's systems for managing heat are less infrastructure-heavy than some countries, which means individual preparation matters more. Take a few minutes today to download the DWD app and check the forecast for your city.

Source: iamexpat