Late Summer Weather Germany to Hungary?

Check climate tables for towns along your route at Time & Date website. They use the newest 30-year period.

Example Vienna: https://www.timeanddate.com/weather/austria/vienna/climate

Be aware that what they show as high temperature is NOT the max. temperature of days in this period. So day max temperatures can be much higher than shown there.

I use timeanddate.com for this sort of information, but not the monthly averages. I look at the actual, historical, day-by-day weather data so I can see how hot or how cold it might be at the time of my trip. I check the most recent five years, because there can be considerable year-to-year variation.

Here's where to look: https://www.timeanddate.com/weather/hungary/budapest/historic?month=8&year=2025

Use the pull-down box at the right, just above the graph, to see statistics for other months/years. Use the Search box near the upper right if you want to look at weather in other cities.

As you can see, August can be quite grim. Your odds will be better in September, but there could still be some rather hot days. The central European capitals can swelter in the summer, but they will probably not be super-hot every day, which is what you could run into in southern Italy or much of Spain.

Someone here mentioned Weatherspark, which I had never heard of. I was curious and checked it out and now I'm a convert. Very comprehensive, including humidity graphs and ratings from comfortable to oppressive, ability to compare different cities and years, days of rain, percentage of cloud cover, etc. Even moon cycles, if that is a concern.

I had a look at Weatherspark. They seem to fake data. When you click on a year above climate diagram they switch to the "next" airport weather data which can be very far away and very different to the place you look for. They use a good visualization engine but not the correct measurement data available for the chosen place.

I had a look at Weatherspark. They seem to fake data. When you click on a year above climate diagram they switch to the "next" airport weather data which can be very far away and very different to the place you look for. They use a good visualization engine but not the correct measurement data available for the chosen place.

Oh wow, I guess I hadn't used that feature. I liked their "comfort" graphs with cloud and rain % estimates. I guess I should take a deeper look.

(btw, your town looks lovely, I hope to visit it someday.)

Thank you, Wanderbug.

Actually I catch myself smiling sometimes when just driving through my little town. Although we have also the not nice parts of GDR mass building initiatives. The Schelfmarkt is one nice place with some old half-timbered houses around. The highlight is the castle of course. So, feel welcome to visit Schwerin in the future.

And I made the trial with Schwerin and got Hamburg data which were in Jan and Feb this year a difference of a few degrees Celsius. Schwerin had colder temperatures (lowest -11.5 °C) but the towns close to Polish border had the hardest times with temperatures around -14°C measured and -20°C as windchill.

rhallva, one more info: The forecasts in mid Europe are reliable / likely 3-5 days in advance, not longer.

Besides national / local reports also Windy is a very good source. Avoid US-based apps for Europe, they use US weather forecasting models which are less usable for Europe or they just copy data from somewhere.

My uncle was a studied meteo guy.

The quick answer is to go in September as its less crowded and cooler and maybe a little bit less expensive.

The long answer is that I have never been able to accurately, within a few degrees, predict the temperature in a holiday location on a specific day, 5 months in advance. I do good with a range of temperatures, and I do good with planning how to deal with the possibility of warm afternoons.

I tend to use WeatherSpark. I have checked the averages they publish against Accuweather and NOAA and the three reports are within 1°F (0.56C). So, I am good with that. Among the good stuff on WeatherSpark is the ease of looking at months and days individually and comparing different locations.

• So for your trip, here is start of the trip:
  https://weatherspark.com/m/75484/9/Average-Weather-in-September-in-Vilshofen-Bavaria-Germany
• And here is the end of the trip: https://weatherspark.com/m/84771/9/Average-Weather-in-September-in-Budapest-Hungary
• Then it’s always fun to lay one over the other: https://weatherspark.com/compare/m/9/75484~84771/Comparison-of-the-Average-Weather-in-Vilshofen-and-Budapest-in-September

But the world is changing and I think it’s a amazing the process that Acraven goes through and it gives her great peace of mind, so absolutely correct for her. I am not as well edutated. Heck to this day you can still see students on horseback on my college campus.

Weatherspark does provide an average and two probability bands that if you use them in your considerations should cover the global warming issue to a large degree. The bands are described as:

The daily average high (red line) and low (blue line) temperature,
with 25th to 75th and 10th to 90th percentile bands.

I use the 25th to 75th band as that’s the middle half of the data set. So while the average temperature in Budapest on 6 August is 81°F (hottest average temperature of the year) a realistic range to plan for is going to be 76°F to 87°F because odds are G-d will pick a temperature in that range.

Okay then, “81°F too hot,” well, would 78°F be okay? Because if you click on 6 August at WeatherSpark you will note that prior to 2pm and after 6pm the temperatures are 78°F and below. So, spend that period in an air-conditioned restaurant for lunch and a museum before lunch and the basilica after lunch.

But comfort is about more than just temperature and WeatherSpark provides a little dotted line for that. The difference is that humidity can make a substantial difference in how hot it feels. 81°F in Houston for instance is substantially hotter than 81°F in any of your route.

Finally, air movement. The windspeed can extend the comfort range quite a bit. On a hot day, I go down to the river. I think it’s part of the river channeling the air through the valley and part a sort of sea breeze effect because of the evaporation off the water in the river; but it’s substantially more comfortable along the river on a hot day because there is a constant breeze.

I'd pick September. August is hot and busy. September has milder temperatures and less people.