Azores weather in September

September stays close to midsummer warmth at these stations. Ponta Delgada on São Miguel cools just 1 °C from August's average daily high. It remains 2.4 °C warmer than October. September is its second warmest month.

Ponta Delgada averages 16.2 days reaching at least 25 °C. Average night lows remain near 19 °C across the seven stations. I'd pack light clothes for the day. Add a layer for evenings.

September rainfall exceeds August's at all seven stations. Ponta Delgada's total is about three times July's. It averages 9.4 days with at least 1 mm of rain. Of those, 1.9 days reach 10 mm or more.

A rain day records a daily total. It does not mean rain from morning to night. Rainfall increases with altitude across the Azores. Check the local forecast before a walk. I'd keep the order of outdoor plans flexible.

Santa Maria and Graciosa have the lowest September rainfall totals in this station comparison. Santa Maria Airport comes first. Santa Cruz da Graciosa follows closely. Flores Airport records about twice Santa Maria's monthly rainfall.

Each figure describes its named station. The reference periods differ, as the table shows. I'd choose Santa Maria if low rainfall matters most. The temperature gap between these stations is small. Keep a wet weather plan wherever you stay.

Yes, September is a good month for sea swimming. The regional average sea temperature is about 22 °C. I'd choose a supervised bathing spot. Follow the flags and lifeguards' instructions.

September also falls within the 2026 bathing season at Vila Franca Islet on São Miguel. The boat season ran from 12 June to 11 October. I'd book the crossing after checking the sea forecast.

September suits walks and whale watching. Check the trail status page before choosing a route. We refresh regional alerts twice a day. Match the walk to the forecast and your fitness.

Whale watching runs throughout the year from Ponta Delgada. Futurismo operates in every season. Sperm whales are present all year. Unsafe weather cancels departures. I'd book early in the trip. Leave another possible date free.

September also suits diving. It falls within the June to September period for clearer water and calmer winds. I'd compare diving options when choosing your island.

Pack light clothes and a waterproof jacket for September. Add a layer for evenings or boat trips. Choose walking shoes with good grip. Wear clothes you can add or remove while walking.

Bring a swimsuit and towel for the sea. Pack a hat and suncream. Use sun protection on cloudy days too. I'd carry spare socks in a dry bag. Keep a dry top for after a swim.