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 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
The advent of September reveals an average high-temperature of an enjoyable 17.9°C (64.2°F), showing minimal difference from the prior month. An average low-temperature of 10.6°C (51.1°F) is anticipated throughout the nights during September.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, in Grantham, the rain falls for 10.3 days. Throughout September, 18mm (0.71") of precipitation is accumulated. In Grantham, during the entire year, the rain falls for 152.3 days and collects up to 262mm (10.31") of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 40min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:41 pm BST.
Sunshine
The average sunshine in September is 6.9h.UV index
In September, the average daily maximum UV index in Grantham, United Kingdom, is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 in September translates into these instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
What is the temperature in September in Grantham?
What is the average humidity in September in Grantham?
How many days does it rain in September in Grantham?
When it does not snow in Grantham?
What is the average length of the day in September in Grantham?
What time are sunrise and sunset in September in Grantham?
How many hours of sunshine does Grantham have in September?
How high is the UV index in September in Grantham?
Average temperature in September
Grantham, United Kingdom
- Average high temperature in September: 17.9°C
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is January (5.8°C).
- Average low temperature in September: 10.6°C
The month with the highest average low temperature is August (12.8°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure in September
Grantham, United Kingdom
- Average pressure in September: 1016.1mbar
The month with the highest atmospheric pressure is May (1016.4mbar).
The month with the lowest atmospheric pressure is November (1009.7mbar).
Average wind speed in September
Grantham, United Kingdom
- Average wind speed in September: 13.4km/h
The windiest month (with the highest average wind speed) is December (18.5km/h).
The calmest month (with the lowest average wind speed) is July (12.7km/h).
Average humidity in September
Grantham, United Kingdom
- Average humidity in September: 79%
The month with the highest relative humidity is December (90%).
The month with the lowest relative humidity is August (77%).
Average rainfall in September
Grantham, United Kingdom
- Average rainfall in September: 18mm
The wettest month (with the highest rainfall) is June (37mm).
The driest months (with the least rainfall) are March and April (15mm).
Average rainfall days in September
Grantham, United Kingdom
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is February (8.9 days).
Average snowfall in September
Grantham, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (17mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Grantham, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grantham, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in September: 6h and 5min
The months with the most sunshine are July and August (Average sunshine: 7h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Grantham, United Kingdom
- Average sunshine days in September: 15.8 days
The months with the most sunshine days are October and December (15.9 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Grantham, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grantham, United Kingdom
- Average cloud cover in September: 49
The month with the most cloud cover is November (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).
Average visibility in September
Grantham, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, July, August, September, October and December (9km).
The months with the lowest visibility are June and November (8km).
Grantham, United Kingdom
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