September weather forecastDumbarton, United Kingdom
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Dumbarton, United Kingdom, with temperature in the range of an average high of 14.2°C (57.6°F) and an average low of 8.5°C (47.3°F).Temperature
Dumbarton's shift into September sets the average high-temperature at a mild 14.2°C (57.6°F), a figure that deviates only slightly from August's 16.2°C (61.2°F). Dumbarton's average low-temperature in the month of September is recorded at a chilly 8.5°C (47.3°F).Humidity
In Dumbarton, the average relative humidity in September is 89%.Rainfall
In Dumbarton, in September, during 20 rainfall days, 54mm (2.13") of precipitation is typically accumulated. In Dumbarton, United Kingdom, during the entire year, the rain falls for 242.3 days and collects up to 788mm (31.02") of precipitation.Snowfall
May through October are months without snowfall in Dumbarton, United Kingdom.Sea temperature
In Dumbarton, in September, the average water temperature is 14°C (57.2°F).Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
Daylight
The average length of the day in September is 12h and 44min.On the first day of September in Dumbarton, sunrise is at 6:23 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 6:55 pm BST.
Sunshine
The average sunshine in September is 5.5h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dumbarton, United Kingdom
- Average high temperature in September: 14.2°C
The warmest month (with the highest average high temperature) is July (16.8°C).
The month with the lowest average high temperature is January (4.9°C).
- Average low temperature in September: 8.5°C
The month with the highest average low temperature is July (10°C).
The coldest months (with the lowest average low temperature) are January and February (1.4°C).
Average pressure in September
Dumbarton, United Kingdom
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is May (1015.3mbar).
The month with the lowest atmospheric pressure is November (1006.7mbar).
Average wind speed in September
Dumbarton, United Kingdom
- Average wind speed in September: 14.1km/h
The windiest month (with the highest average wind speed) is January (18.6km/h).
The calmest month (with the lowest average wind speed) is July (12km/h).
Average humidity in September
Dumbarton, United Kingdom
- Average humidity in September: 89%
The months with the highest relative humidity are November and December (90%).
The months with the lowest relative humidity are April and May (83%).
Average rainfall in September
Dumbarton, United Kingdom
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is December (88mm).
The driest month (with the least rainfall) is April (37mm).
Average rainfall days in September
Dumbarton, United Kingdom
- Average rainfall days in September: 20 days
The months with the highest number of rainy days are July and August (23 days).
The month with the least rainy days is February (17.3 days).
Average snowfall in September
Dumbarton, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (49mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Dumbarton, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Dumbarton, United Kingdom
- Average sea temperature in September: 14°C
The best month for swimming (with the highest average sea temperature) is August (14.3°C).
The coldest month (with the lowest average sea temperature) is March (7.4°C).
Average daylight in September /
Average sunshine in September
Dumbarton, United Kingdom
- Average daylight in September: 12h and 42min
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: 5h and 30min
The month with the most sunshine is June (Average sunshine: 7h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in September
Dumbarton, United Kingdom
- Average sunshine days in September: 7.5 days
The month with the most sunshine days is March (9.4 days).
The month with the least sunshine days is July (5.3 days).
Average UV index in September
Dumbarton, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are May, June and July (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Dumbarton, United Kingdom
- Average cloud cover in September: 64
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 56).
Average visibility in September
Dumbarton, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are February, March, April and May (9km).
The months with the lowest visibility are January, June, July, August, September, October, November and December (8km).
