Frankfurt in August: August continues the high summer warmth but often brings the first brief cool spells from Atlantic disturbances and occasional heavy rainfall events. Frankfurt am Main lies in a wind-sheltered valley surrounded by uplands and is one of Germany's warmest and sunniest cities. Climate change is leaving visible traces here too: deviations from the long-term mean reveal how weather extremes in Frankfurt have shifted over the past decades.
August in Frankfurt typically shows persistent summer warmth with the first signs of approaching autumn. Deviations from the 10-year average reveal how the local climate is changing.
Planning around August in Frankfurt? This page shows the average weather in Frankfurt during August 2025, compared against the 10-year climatological mean. The comparison covers daily maximum and minimum temperature, sunshine hours, precipitation, and peak wind speed. Those five variables most reliably describe whether a month felt warmer, sunnier, wetter or windier than usual.
Historical weather data for Frankfurt comes from the ERA5 reanalysis product, a high-resolution dataset maintained by the European Centre for Medium-Range Weather Forecasts (ECMWF) and delivered through Open-Meteo. ERA5 is one of the most accurate publicly available sources for historical Frankfurt climate values, updated daily and covering every month from 1940 to today. That means typical Frankfurt August conditions are grounded in measured values, not a statistical model.
The KPI cards on this page each show two numbers: the current August 2025 value for Frankfurt, and its deviation from the 10-year reference mean. A positive deviation means the month ran warmer, sunnier, wetter or windier than the recent climate normal for Frankfurt in August. Weather in Frankfurt Augusthas shifted measurably over recent decades; to explore Frankfurt August climate year by year, open the climate trend page. To compare Frankfurt weather against another city for the same month, use the weather comparison tool.
This page is a retrospective, not a forecast. If you are planning travel, a garden project, a photo shoot, or an event in Frankfurt in August, use the measured historical values as a realistic baseline and treat them as a distribution, not a guarantee. The 10-year mean smooths over individual extreme years; the current-year values show where this particular August sat against that baseline. For typical Frankfurt August conditions across a longer window, the climate trend page covers every year back to 1940. For day-level detail rather than monthly aggregates, compare arbitrary date ranges for Frankfurt using the period comparison tool on the homepage.
This page compares the daily measured values of the current year against the average of the last ten years, the so-called 10-year mean. The deviation values in the KPI cards show directly whether the current month is warmer, sunnier, wetter, or windier than usual. The reference data comes from Open-Meteo's ERA5 weather archive and includes daily measured maximum and minimum temperatures, sunshine hours, precipitation totals, and wind speeds.
A ten-year average is short enough to reflect current climate trends, yet long enough to statistically balance out individual extreme years. The World Meteorological Organization (WMO) recommends 30-year normals as the official climate reference, our 10-year mean is deliberately more present-focused and therefore shows the climate change of the most recent decade more clearly.
The daily data for the current year comes directly from Open-Meteo in real time. The reference mean is calculated from actual measured values of the last 10 years, no statistical model, but real historical archive data. The basis is ECMWF's ERA5 reanalysis dataset.
The deviation shows the difference between the current monthly average and the 10-year reference value for the same month. A value of +2.3 °C means: the current month is on average 2.3 degrees warmer than the average of the last 10 years.
Weather review pages are available for over 100 cities in Germany, Austria, and Switzerland. Choose your city from the overview page or use the weather comparison tool on the homepage for custom periods.