I'm a paid user, using the web UI (Firefox). The forecast is always using 1 hour, regardless of whether or not the "1h forecast" box is checked.
I'd like (and expect) that the previous / unpaid 3 hour is enabled when the checkbox is off. I still want to jump through the week at 3 hour increments, without pressing 24 times per day for each day. I'd even sort of like a setting to pick 1 vs 3 vs 6 hour steps or something. But at least 1 vs 3.