Monthly climate guide
Ondarroa weather in September
September in Ondarroa is typically warm, with average daytime highs around 22°C (72°F) and night-time lows near 18°C (65°F). The month usually brings about 55 mm of rain (some rain) and is often cloudy. Daytime highs are about the same as August and 3°C warmer than October.
What stands out in September
- September brings early autumn to Ondarroa.
- It's one of the sunniest months here, with cloud cover around 63%.
- September is Ondarroa's third warmest month.
- Days and nights are close, only about 4°C apart.
Avg high
22°C
72°F
Avg low
18°C
65°F
Rainfall
55 mm
some rain
Humidity
73%
relative
Sky
63%
cloud · often cloudy
Ondarroa weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 12°C / 53°F | 9°C / 47°F | 147 mm | 80% | 83% |
| February | 12°C / 53°F | 8°C / 46°F | 126 mm | 79% | 79% |
| March | 13°C / 56°F | 9°C / 49°F | 101 mm | 79% | 74% |
| April | 15°C / 59°F | 11°C / 52°F | 93 mm | 79% | 72% |
| May | 17°C / 63°F | 13°C / 56°F | 76 mm | 80% | 72% |
| June | 20°C / 68°F | 16°C / 61°F | 71 mm | 80% | 69% |
| July | 23°C / 73°F | 19°C / 66°F | 50 mm | 78% | 64% |
| August | 24°C / 74°F | 19°C / 67°F | 37 mm | 74% | 63% |
| September | 22°C / 72°F | 18°C / 65°F | 55 mm | 73% | 63% |
| October | 20°C / 67°F | 15°C / 60°F | 88 mm | 74% | 70% |
| November | 16°C / 60°F | 12°C / 53°F | 156 mm | 78% | 79% |
| December | 13°C / 56°F | 10°C / 49°F | 128 mm | 79% | 80% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Ondarroa?
Compare the months in the chart above to find your ideal window.
Best time to visit Ondarroa →Other Spain cities in September
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Ondarroa weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/spain/ondarroa/september
<a href="https://weathercompare.eu/weather/spain/ondarroa/september">Ondarroa weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/spain/ondarroa" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Ondarroa weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/spain/ondarroa/september">Ondarroa weather in September</a> – WeatherCompare</p>
Ondarroa in September: quick answers
Is September a good time to visit Ondarroa?
Yes. September is one of the best months for Ondarroa, with highs around 22°C and about 55 mm of rain.
How warm is Ondarroa in September?
Average highs are about 22°C (72°F) and average lows about 18°C (65°F), based on 10 years of daily data.
Does it rain a lot in Ondarroa in September?
Ondarroa typically gets around 55 mm of rain in September — some rain.
Figures are long-term averages for the area around Ondarroa (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.