Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Ondarroa, Spain, experiences a recorded average high-temperature of an agreeable 21.1°C (70°F) in September, closely aligned with August's 23.1°C (73.6°F). September nights in Ondarroa are marked by an average temperature drop to a refreshing 15.5°C (59.9°F).Humidity
In Ondarroa, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall in Ondarroa. Rain falls for 15.5 days and accumulates 44mm (1.73") of precipitation.Snowfall
In Ondarroa, snow does not fall in April through November.Sea temperature
In Ondarroa, the average seawater temperature in September is 20.8°C (69.4°F).Note: Swimming in 20.8°C (69.4°F) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 21°C (69.8°F).
Daylight
The average length of the day in September in Ondarroa is 12h and 30min.On the first day of September, sunrise is at 07:34 and sunset at 20:44. On the last day of the month, sunrise is at 08:06 and sunset at 19:52 CEST.
Sunshine
In Ondarroa, Spain, the average sunshine in September is 8.3h.UV index
May through September, with an average maximum UV index of 5, are months with the highest UV index in Ondarroa. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 5 during September translates into the following guidance:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What is the temperature in September in Ondarroa?
What is the average humidity in September in Ondarroa?
What is the driest month in Ondarroa?
How much does it rain in Ondarroa in September?
When it does not snow in Ondarroa?
What is the sea water temperature in September in Ondarroa?
How many hours of daylight does Ondarroa have in September?
When is the sunrise / sunset in September in Ondarroa?
How long on average sun shines in September in Ondarroa?
What is the month with the highest UV index in Ondarroa?
What is the UV index reading in September in Ondarroa?
Average temperature in September
Ondarroa, Spain
- Average high temperature in September: 21.1°C
The warmest month (with the highest average high temperature) is August (23.1°C).
The month with the lowest average high temperature is January (9.9°C).
- Average low temperature in September: 15.5°C
The month with the highest average low temperature is August (17°C).
The coldest month (with the lowest average low temperature) is February (6.1°C).
Average pressure in September
Ondarroa, Spain
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.8mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Ondarroa, Spain
- Average wind speed in September: 10.8km/h
The windiest month (with the highest average wind speed) is November (16.8km/h).
The calmest month (with the lowest average wind speed) is August (9.9km/h).
Average humidity in September
Ondarroa, Spain
- Average humidity in September: 76%
The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Ondarroa, Spain
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is November (121mm).
The driest month (with the least rainfall) is September (44mm).
Average rainfall days in September
Ondarroa, Spain
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is May (20.7 days).
The month with the least rainy days is October (14.8 days).
Average snowfall in September
Ondarroa, Spain
- Average snowfall in September: 0mm
The month with the highest snowfall is February (7mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Ondarroa, Spain
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Ondarroa, Spain
- Average sea temperature in September: 20.8°C
The best month for swimming (with the highest average sea temperature) is August (21.3°C).
The coldest month (with the lowest average sea temperature) is February (12.4°C).
Average daylight in September /
Average sunshine in September
Ondarroa, Spain
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 18min).
The month with the least sunshine is November (Average sunshine: 4h and 48min).
Average sunshine days in September
Ondarroa, Spain
- Average sunshine days in September: 11.6 days
The month with the most sunshine days is October (13.6 days).
The month with the least sunshine days is May (6.8 days).
Average UV index in September
Ondarroa, Spain
- Average UV index in September: 5
The months with the highest UV index are May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 3).
Average cloud cover in September
Ondarroa, Spain
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in September
Ondarroa, Spain
- Average visibility in September: 10km
The months with the highest visibility are February, March, June, July, August, September, October and December (10km).
The months with the lowest visibility are January, April, May and November (9km).
Ondarroa, Spain
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