Lisbon's curated shortlist covers 66 activities across 6 interest lenses. Five of those carry 12 picks each. Adventure, Family & Kids, Food & Drink, History & Heritage, and Rainy-Day & Indoor all hit the cap. Nightlife & Evening holds 6. The 12-deep Rainy-Day & Indoor shortlist does the most work between seasons. August averages 29°C with 0 rain days, so the indoor 12 sit idle. September brings 6 rain days at 26°C, and the indoor 12 come off the bench.
Pair the lenses rather than exhausting one before you start the next. A Food & Drink morning and a History & Heritage afternoon make a full day without repeating a category. Family & Kids at 12 picks carries a household through 3 or 4 days in Lisbon. Nightlife & Evening's 6 selections suit a long weekend. Treat Rainy-Day & Indoor as an unscheduled swap list during August's 0-rain-day stretch. September's 6 rain days move it into active rotation.
The drop from August's 29°C and 0 rain days to September's 26°C and 6 feels sharper in practice than on paper. A September visitor with 3 full days in Lisbon will likely see rain on at least 1 of them. The 12 Rainy-Day & Indoor picks are sized for that swap.
September's average of 26°C and 6 rain days, against August's 29°C and 0, shifts the 12 Rainy-Day & Indoor selections from backup to regular rotation.