As I've done a few times since 2020, I'm planning to walk a marathon distance this coming Saturday. Last year I got to 42.2 km in 6:41:36; this year I hope to break 6:30. The weather forecast looks incredible for Saturday, which makes me optimistic:
Starting nice and cool with the dewpoint staying below 9°C all day is perfect. Combine that with light winds out of the north (middle panel) and crystal-clear skies (bottom panel) and you've got perfect conditions for a long walk. Last year it got up to 26°C with a dewpoint of 15°C, which we did not enjoy all that much.
And that, of course, is why I moved the walk to October. The trees along the route are near peak foliage, the weather is cooler, the sun is lower in the sky and sets earlier—all things that should help our pace.
This should be fun!