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
With the advent of September, Helensburgh's high-temperatures adjust to a still refreshing 13.9°C (57°F), closely aligning with the preceding month. Helensburgh encounters an average low-temperature of 8.7°C (47.7°F) during September nights.Humidity
January, August through December, with an average relative humidity of 89%, are the most humid months in Helensburgh.Rainfall
In Helensburgh, United Kingdom, in September, during 21.5 rainfall days, 80mm (3.15") of precipitation is typically accumulated. Throughout the year, in Helensburgh, United Kingdom, there are 249.9 rainfall days, and 1079mm (42.48") of precipitation is accumulated.Snowfall
In Helensburgh, snow does not fall in May through October.Sea temperature
In Helensburgh, in September, the average water temperature is 13.7°C (56.7°F).Note: You can swim in 13.7°C (56.7°F) below 10°C (50°F) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 13°C (55.4°F) without it is tough.
Daylight
In Helensburgh, the average length of the day in September is 12h and 44min.On the first day of September, sunrise is at 6:24 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 6:56 pm BST.
Sunshine
The average sunshine in September is 4.9h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 3 transforms into the following instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What are September temperatures in Helensburgh?
What are the most humid months in Helensburgh?
What is the average humidity in September in Helensburgh?
How many days does it rain in September in Helensburgh?
When it does not snow in Helensburgh?
What is the water temperature in September in Helensburgh?
What is the average length of the day in September in Helensburgh?
When are sunrise and sunset in September in Helensburgh?
How many hours of sunshine does Helensburgh have in September?
What is the UV index intensity in September in Helensburgh?
Average temperature in September
Helensburgh, United Kingdom
- Average high temperature in September: 13.9°C
The warmest month (with the highest average high temperature) is July (16.3°C).
The month with the lowest average high temperature is January (5°C).
- Average low temperature in September: 8.7°C
The month with the highest average low temperature is July (9.8°C).
The coldest month (with the lowest average low temperature) is February (1.4°C).
Average pressure in September
Helensburgh, United Kingdom
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.6mbar).
Average wind speed in September
Helensburgh, United Kingdom
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is January (19.3km/h).
The calmest months (with the lowest average wind speed) are June and July (11.9km/h).
Average humidity in September
Helensburgh, United Kingdom
- Average humidity in September: 89%
The months with the highest relative humidity are January, August, September, October, November and December (89%).
The months with the lowest relative humidity are April and May (83%).
Average rainfall in September
Helensburgh, United Kingdom
- Average rainfall in September: 80mm
The wettest month (with the highest rainfall) is December (116mm).
The driest month (with the least rainfall) is April (48mm).
Average rainfall days in September
Helensburgh, United Kingdom
- Average rainfall days in September: 21.5 days
The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is February (17.8 days).
Average snowfall in September
Helensburgh, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (53mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Helensburgh, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
Helensburgh, United Kingdom
- Average sea temperature in September: 13.7°C
The best month for swimming (with the highest average sea temperature) is August (13.8°C).
The coldest month (with the lowest average sea temperature) is March (7.2°C).
Average daylight in September /
Average sunshine in September
Helensburgh, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 30min).
The month with the shortest days is December (Average daylight: 7h and 6min).
- Average sunshine in September: 4h and 5min
The month with the most sunshine is June (Average sunshine: 6h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 0min).
Average sunshine days in September
Helensburgh, United Kingdom
- Average sunshine days in September: 6.8 days
The month with the most sunshine days is April (8.8 days).
The months with the least sunshine days are July and August (5.4 days).
Average UV index in September
Helensburgh, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are May and June (UV index 4).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Helensburgh, United Kingdom
- Average cloud cover in September: 68
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is April (Cloud cover 59).
Average visibility in September
Helensburgh, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May and November (9km).
The months with the lowest visibility are June, July, August, September, October and December (8km).
Helensburgh, United Kingdom
Weather forecast for your location
2. Allow the app to use your location
