Climate and monthly weather forecastDumbarton, United Kingdom
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Dumbarton, United Kingdom, with an average temperature ranging between min 1.4°C (34.5°F) and max 4.9°C (40.8°F). With average high temperatures of 4.9°C (40.8°F) and lows of 1.4°C (34.5°F), January is the coldest month. Weather in January »Weather in February
February, the last month of the winter in Dumbarton, is also an icy month, with an average temperature varying between 1.4°C (34.5°F) and 5.6°C (42.1°F). February's onset records a minor alteration in the average high-temperature to a still wintry 5.6°C (42.1°F) from January's 4.9°C (40.8°F). Weather in February »Weather in March
March, the first month of the spring in Dumbarton, is a chilly month, with temperature in the range of an average high of 7.3°C (45.1°F) and an average low of 2°C (35.6°F). Dumbarton records a slight change with March's average high-temperatures adjusting to a chilly 7.3°C (45.1°F) from February's 5.6°C (42.1°F). Weather in March »Weather in April
April in Dumbarton, United Kingdom, is a fresh spring month, with an average temperature fluctuating between 3.8°C (38.8°F) and 10.5°C (50.9°F). Dumbarton in April denotes a subtle temperature transition, adjusting from an average high of a frosty 7.3°C (45.1°F) in March to a fresh 10.5°C (50.9°F). Weather in April »Weather in May
The last month of the spring, May, is also a fresh month in Dumbarton, United Kingdom, with an average temperature ranging between max 12.9°C (55.2°F) and min 5.8°C (42.4°F). Dumbarton, United Kingdom, experiences a transition to a still cool 12.9°C (55.2°F) in average high-temperatures with the arrival of May, not greatly differing from April's 10.5°C (50.9°F). Weather in May »Weather in June
The first month of the summer, June, is a refreshing month in Dumbarton, United Kingdom, with an average temperature fluctuating between 8.1°C (46.6°F) and 15.5°C (59.9°F). The average high-temperature during June is a moderate 15.5°C (59.9°F), almost matching the conditions of the preceding month. Weather in June »Weather in July
July in Dumbarton, United Kingdom, is an enjoyable summer month, with an average temperature fluctuating between 10°C (50°F) and 16.8°C (62.2°F). July brings the highest temperatures, with an average high of 16.8°C (62.2°F) and an average low of 10°C (50°F). Weather in July »Weather in August
The last month of the summer, August, is also an enjoyable month in Dumbarton, United Kingdom, with an average temperature varying between 16.2°C (61.2°F) and 9.7°C (49.5°F). The average high-temperature during August registers at a still enjoyable 16.2°C (61.2°F), maintaining a close resemblance to the previous month. Weather in August »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). 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). Weather in September »Weather in October
October, like September, in Dumbarton, United Kingdom, is a cool autumn month, with an average temperature varying between 6.4°C (43.5°F) and 11.2°C (52.2°F). October sees a slight reduction in average high-temperature, with a shift from a mild 14.2°C (57.6°F) in September to a cool 11.2°C (52.2°F). Weather in October »Weather in November
November, the last month of the autumn in Dumbarton, is also a frosty month, with an average temperature varying between 3.5°C (38.3°F) and 7.5°C (45.5°F). November implies a soft temperature shift, with average high-temperatures reducing from October's fresh 11.2°C (52.2°F) to a chilly 7.5°C (45.5°F). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Dumbarton, United Kingdom, with temperature in the range of an average low of 1.9°C (35.4°F) and an average high of 5.5°C (41.9°F). December brings a marginal elevation to a cold 5.5°C (41.9°F) from November's 7.5°C (45.5°F) in Dumbarton's average high-temperatures. Weather in December »Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Dumbarton, United Kingdom, experiences its average lowest temperatures in January, reaching a peak of 4.9°C (40.8°F) and a minimum of 1.4°C (34.5°F).
In Dumbarton, during the entire year, the rain falls for 242.3 days and collects up to 788mm (31.02") of precipitation.
Months with snowfall are January through April, November and December.
Throughout the year, there are 13 snowfall days, and 127mm (5") of snow is accumulated.
The months with the lowest UV index in Dumbarton are January through April, October through December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 3.9 days and accumulates 49mm (1.93") of snow.
The month with the least sunshine in Dumbarton is February, with an average of 3.4h of sunshine.
The month with the coldest seawater is March, with an average sea temperature of 7.4°C (45.3°F).
The months with the lowest humidity are April and May, with an average relative humidity of 83%.
The month with the least rainfall is April, when the rain falls for 17.8 days and typically collects 37mm (1.46") of precipitation.
In Dumbarton, United Kingdom, snow does not fall in May through October.
The months with the highest UV index in Dumbarton are May through July, with an average maximum UV index of 4.
With an average of 17h and 30min of daylight, June has the longest days of the year in Dumbarton, United Kingdom.
With an average of 7.1h of sunshine, June has the most sunshine of the year in Dumbarton, United Kingdom.
July is the month when Dumbarton's temperatures reach their peak, with averages of 16.8°C (62.2°F) and lows of 10°C (50°F).
With an average sea temperature of 14.3°C (57.7°F), August is the month with the warmest seawater.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Dumbarton, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
November and December, with an average relative humidity of 90%, are most humid months in Dumbarton.
The month with the most rainfall in Dumbarton is December, when the rain falls for 21.8 days and typically aggregates up to 88mm (3.46") of precipitation.
The month with the shortest days in Dumbarton is December, with an average of 7h and 6min of daylight.
Average temperature
Dumbarton, United Kingdom
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).
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
Dumbarton, United Kingdom
- Average pressure in January:
1008.8mbar - Average pressure in February:
1009mbar - Average pressure in March:
1012.4mbar - Average pressure in April:
1014.5mbar - Average pressure in May:
1015.3mbar - Average pressure in June:
1014.6mbar
- Average pressure in July:
1012.6mbar - Average pressure in August:
1011.2mbar - Average pressure in September:
1013.3mbar - Average pressure in October:
1011.4mbar - Average pressure in November:
1006.7mbar - Average pressure in December:
1007.9mbar
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
Dumbarton, United Kingdom
- Average wind speed in January:
18.6km/h - Average wind speed in February:
17.9km/h - Average wind speed in March:
17.5km/h - Average wind speed in April:
15km/h - Average wind speed in May:
14.4km/h - Average wind speed in June:
12.1km/h
- Average wind speed in July:
12km/h - Average wind speed in August:
12.9km/h - Average wind speed in September:
14.1km/h - Average wind speed in October:
15.2km/h - Average wind speed in November:
15.8km/h - Average wind speed in December:
18.2km/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
Dumbarton, United Kingdom
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
Dumbarton, United Kingdom
The wettest month (with the highest rainfall) is December (88mm).
The driest month (with the least rainfall) is April (37mm).
Average rainfall days
Dumbarton, United Kingdom
- Average rainfall days in January:
20.2 days - Average rainfall days in February:
17.3 days - Average rainfall days in March:
18.9 days - Average rainfall days in April:
17.8 days - Average rainfall days in May:
19.6 days - Average rainfall days in June:
20.8 days
- Average rainfall days in July:
23 days - Average rainfall days in August:
23 days - Average rainfall days in September:
20 days - Average rainfall days in October:
20.5 days - Average rainfall days in November:
19.4 days - Average rainfall days in December:
21.8 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
Dumbarton, United Kingdom
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
Dumbarton, United Kingdom
- Average snowfall days in January:
3.8 days - Average snowfall days in February:
3.9 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.3 days - Average snowfall days in December:
2.5 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
Dumbarton, United Kingdom
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 / Average sunshine
Dumbarton, United Kingdom
- Average daylight in January:
7h and 42min - Average daylight in February:
9h and 36min - Average daylight in March:
11h and 54min - Average daylight in April:
14h and 12min - Average daylight in May:
16h and 18min - Average daylight in June:
17h and 30min
- Average daylight in July:
16h and 54min - Average daylight in August:
15h and 0min - Average daylight in September:
12h and 42min - Average daylight in October:
10h and 24min - Average daylight in November:
8h and 18min - Average daylight in December:
7h and 6min
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 January:
3h and 30min - Average sunshine in February:
3h and 24min - Average sunshine in March:
4h and 36min - Average sunshine in April:
6h and 36min - Average sunshine in May:
6h and 36min - Average sunshine in June:
7h and 6min
- Average sunshine in July:
6h and 24min - Average sunshine in August:
5h and 42min - Average sunshine in September:
5h and 30min - Average sunshine in October:
3h and 36min - Average sunshine in November:
4h and 0min - Average sunshine in December:
3h and 36min
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
Dumbarton, United Kingdom
- Average sunshine days in January:
6.9 days - Average sunshine days in February:
8.1 days - Average sunshine days in March:
9.4 days - Average sunshine days in April:
8.9 days - Average sunshine days in May:
8.4 days - Average sunshine days in June:
6.1 days
- Average sunshine days in July:
5.3 days - Average sunshine days in August:
5.4 days - Average sunshine days in September:
7.5 days - Average sunshine days in October:
8.7 days - Average sunshine days in November:
8 days - Average sunshine days in December:
6.3 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
Dumbarton, United Kingdom
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
Dumbarton, United Kingdom
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
Dumbarton, United Kingdom
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).
