Costa da Caparica (Caparica) weather in September
September in Costa da Caparica: warm, dry, with clean air — an excellent time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#4 of 12 months in Costa da Caparica · #363 of 1413 destinations to visit in September · comfort 87/100 (tier A)
- Days
- 27°C
- Nights
- 18°C
- Wet days
- 3
- Sun
- 10.8 h
- Humidity
- 74%
- Daylight
- 12 h
Traveller notes on Costa da Caparica in September
Notes from nearby Lisbon (12 km away)
Costa da Caparica doesn't have its own notes for September yet — these are about Lisbon, close enough to share the season.
Regulars are specific that mid-September is a genuine turning point for crowds rather than weather: Portuguese and Spanish schools go back around then, so visitor numbers drop noticeably even as the weather itself stays warm and sunny through the month. Our row backs the pleasant, still-summery read, 27.2C reading as a real 27C, over 18.1C nights, with rain minimal at 23.9mm across 3.2 days. Regulars are consistent nights cool down enough that AC isn't really needed, a genuine comfort upside over the peak summer months. The sea sits at 19.1C, on the cool side but manageable. The record: humidity 73 percent, 10.8 hours of sun, a 22.2 kph wind and AQI 38.
Other months in Costa da Caparica
Lisbon-area forum threads describe January as running around 15C in the day and 7-10C at night on average, with real variation depending on the day - a sunny stretch can reach the high teens C, while a grey, rainy one might barely clear 10C with nights near 5C. Posters recommended warm layers and sturdy, non-slip footwear, since wet cobblestones are a genuine hazard on rainy days around the wider Lisbon coast. Costa da Caparica, just across the river, follows this same general Atlantic winter pattern rather than anything milder or wetter.
Forum posters describe a steady, pleasant Atlantic breeze here that keeps July temperatures from feeling too intense, though it also means the ocean itself stays genuinely cold - posters describe water temperatures under 20C even at the height of summer, more suited to surfing (with a wetsuit) than casual swimming. A light jacket for evenings is standard advice despite the warm days. Posters flag a practical logistics point for anyone coming from Lisbon: bus traffic to and from Costa da Caparica gets genuinely heavy in summer, so a trip that normally takes around 30 minutes can run considerably longer during peak July-August crowds.
Add your own note from Costa da Caparica's card on the map.
Costa da Caparica climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Costa da Caparica in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsBeach season, Lisbon weekend crush, Summer holidays in Portugal(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Costa da Caparica's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherCosta da Caparica's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Costa da Caparica in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Nortada afternoons
1 May – 30 SepWind seasonRiskThe summer north wind fills in after midday and blows sand down the whole strand. Morning is the still half of the day here; by three the windbreaks are up and the umbrellas are down. Source ↗
- Season
Beach season
15 Jun – 15 Sep · usuallySummer season opensCrowdedThe bar-restaurants strung down the dune line only open for the declared bathing season, when the beaches are flagged and staffed. Out of it the sand is yours and there is nowhere to buy lunch. Source ↗
- Season
Lisbon weekend crush
15 Jun – 15 SepDay-tripper crushCrowdedThis is the capital's nearest ocean beach and on a hot Saturday the bridge and the Ponte 25 de Abril approaches back up from mid-morning. Weekdays, or the far southern beaches, are the way round it. Source ↗
- Season
Autumn swell
15 Sep – 31 MarSurf seasonThe beach breaks along the Caparica sandbanks work best when the summer wind drops and the Atlantic lows start tracking in. The surf schools stay open through it with wetsuits. Source ↗
Nearby, and something's on
Within 300 km of Costa da Caparica — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Costa da Caparica?
Costa da Caparica in September — FAQ
- Is September a good time to visit Costa da Caparica?
- September in Costa da Caparica: warm, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Costa da Caparica on SeasonMap's comfort score (87/100).
- What is the weather like in Costa da Caparica in September?
- In September, Costa da Caparica averages a daily high of 27°C and a low of 18°C, with about 23.9 mm of rain over roughly 3.2 rainy days.
- What is the air quality in Costa da Caparica in September?
- Costa da Caparica has a mean US Air Quality Index of about 38 in September.
Within 300 km: Lisbon's Grape harvest around 1 Sep – 15 Oct, and Nazaré's Romaria de Nossa Senhora da Nazare on 5–10 Sep.