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
September brings an average high-temperature of a moderate 15.1°C (59.2°F), nearly identical to the preceding month. In Gretna, an average temperature of 8.8°C (47.8°F) is noted during September nights.Humidity
In Gretna, United Kingdom, the average relative humidity in September is 88%.Rainfall
In Gretna, in September, during 16.3 rainfall days, 37mm (1.46") of precipitation is typically accumulated. In Gretna, during the entire year, the rain falls for 204.6 days and collects up to 478mm (18.82") of precipitation.Snowfall
May through November are months without snowfall.Sea temperature
In September, the average sea temperature is 15.4°C (59.7°F).Note: For most individuals, swimming in 15.4°C (59.7°F) is not a pleasurable activity. Breathing becomes progressively more difficult as water temperature declines below 21°C (69.8°F).
Daylight
In Gretna, the average length of the day in September is 12h and 43min.On the first day of September in Gretna, sunrise is at 6:19 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:50 pm BST.
Sunshine
The average sunshine in September is 6.4h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, an average UV index of 3 transforms into the following instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
What are September temperatures in Gretna?
What is the average humidity in September in Gretna?
How much does it rain in Gretna in September?
When it does not snow in Gretna?
What is the sea temperature in September in Gretna?
How many hours of daylight does Gretna have in September?
When are sunrise and sunset in September in Gretna?
How long on average sun shines in September in Gretna?
What is the UV index reading in September in Gretna?
Average temperature in September
Gretna, United Kingdom
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (17.5°C).
The month with the lowest average high temperature is January (5.2°C).
- Average low temperature in September: 8.8°C
The month with the highest average low temperature is August (10.3°C).
The coldest months (with the lowest average low temperature) are January and February (1.3°C).
Average pressure in September
Gretna, United Kingdom
- Average pressure in September: 1014.3mbar
The month with the highest atmospheric pressure is May (1015.8mbar).
The month with the lowest atmospheric pressure is November (1007.7mbar).
Average wind speed in September
Gretna, United Kingdom
- Average wind speed in September: 14km/h
The windiest month (with the highest average wind speed) is December (18.4km/h).
The calmest months (with the lowest average wind speed) are June and July (12.5km/h).
Average humidity in September
Gretna, United Kingdom
- Average humidity in September: 88%
The months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is April (82%).
Average rainfall in September
Gretna, United Kingdom
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is December (55mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in September
Gretna, United Kingdom
- Average rainfall days in September: 16.3 days
The month with the highest number of rainy days is August (19.9 days).
The month with the least rainy days is April (13.3 days).
Average snowfall in September
Gretna, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (22mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Gretna, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.7 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Gretna, United Kingdom
- Average sea temperature in September: 15.4°C
The best month for swimming (with the highest average sea temperature) is August (15.8°C).
The coldest month (with the lowest average sea temperature) is February (7.1°C).
Average daylight in September /
Average sunshine in September
Gretna, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 18min).
The month with the shortest days is December (Average daylight: 7h and 18min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is May (Average sunshine: 7h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Gretna, United Kingdom
- Average sunshine days in September: 9.4 days
The month with the most sunshine days is April (13 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in September
Gretna, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Gretna, United Kingdom
- Average cloud cover in September: 58
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 51).
Average visibility in September
Gretna, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, October, November and December (9km).
The months with the lowest visibility are June, July, August and September (8km).
Gretna, United Kingdom
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