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
September
Weather in September
Temperature
Portbail's weather in September displays an average high-temperature of a still refreshing 17.5°C (63.5°F), showing minor disparity from August's 18.2°C (64.8°F). During September, the nighttime temperatures in Portbail align closely with the daytime averages, measuring a still refreshing 15.3°C (59.5°F).Humidity
In September, the average relative humidity is 79%.Rainfall
In Portbail, in September, it is raining for 13.3 days, with typically 31mm (1.22") of accumulated precipitation. In Portbail, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.Snowfall
April through October are months without snowfall.Sea temperature
September is the month with the warmest seawater, with an average sea temperature of 17.9°C (64.2°F).Note: For most, swimming in 17.9°C (64.2°F) is not a pleasant activity. Breathing becomes increasingly challenging as water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Portbail, the average length of the day in September is 12h and 36min.On the first day of the month, sunrise is at 07:23 and sunset at 20:49. On the last day of September, in Portbail, sunrise is at 08:05 and sunset at 19:47 CEST.
Sunshine
The average sunshine in September in Portbail is 8.6h.UV index
June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In September, the UV index of 5 transforms into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Portbail in September?
What is the average humidity in September in Portbail?
How many days does it rain in September in Portbail?
When it does not snow in Portbail?
What month is the sea warmest in Portbail?
What is the sea temperature in September in Portbail?
What is the average length of the day in September in Portbail?
When are sunrise and sunset in September in Portbail?
How many hours of sunshine does Portbail have in September?
What are the months with the highest UV index in Portbail?
What is the UV index reading in September in Portbail?
Average temperature in September
Portbail, France
- Average high temperature in September: 17.5°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in September: 15.3°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in September
Portbail, France
- Average pressure in September: 1018mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in September
Portbail, France
- Average wind speed in September: 23.5km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in September
Portbail, France
- Average humidity in September: 79%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in September
Portbail, France
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in September
Portbail, France
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in September
Portbail, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Portbail, France
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Portbail, France
- Average sea temperature in September: 17.9°C
The best month for swimming (with the highest average sea temperature) is September (17.9°C).
The coldest month (with the lowest average sea temperature) is March (8.7°C).
Average daylight in September /
Average sunshine in September
Portbail, France
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in September
Portbail, France
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in September
Portbail, France
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in September
Portbail, France
- Average cloud cover in September: 39
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Portbail, France
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
