Costa Rica in September
September is one of Costa Rica's weaker months (rank 10 of 12): its 10 destinations average 59/100, led by Puerto Viejo at 67 — 34°C and 29 rainy days — while Monteverde is cooler at 27°C and scores 59.
#10 of 12 months for Costa Rica · 10 destinations · updated September 2026 · climate normals from ERA5 reanalysis
🇨🇷 Costa Rica, month by month
59/100 in SeptemberWhere in Costa Rica in September
Comfort is SeasonMap's 0–100 score; each place is judged through the lens that suits it — beaches on beach weather, ski resorts on snow. "At its best" means September is one of that place's own top three months. Feels-like highs fold in humidity, wind and sun.
What's on in Costa Rica in September
- Arribada at Ostional · Nosara · 1 Jul – 31 Dec (usually)
- Humpback whales · Jacó · 15 Jul – 15 Nov (usually)
- Olive ridley nesting · Jacó · 15 Aug – 15 Dec (usually)
- Green turtle nesting · Tortuguero · 1 Jul – 31 Oct
- Raptor migration over Kèköldi · Puerto Viejo · 15 Sep – 15 Nov (usually)
- Independence Day · San José · 14–15 Sep
- Humpbacks off the headland · Manuel Antonio · 15 Jul – 31 Oct (usually)