September weather forecastGrimsby, United Kingdom
September
Weather in September
September, the first month of the autumn in Grimsby, is still a refreshing month, with an average temperature fluctuating between 12.1°C (53.8°F) and 17.2°C (63°F).Temperature
Grimsby observes an average high-temperature of a still refreshing 17.2°C (63°F) in September, barely different from 19.5°C (67.1°F) in August. The average low-temperature in Grimsby during September nights is a fresh 12.1°C (53.8°F).Humidity
In Grimsby, the average relative humidity in September is 79%.Rainfall
In Grimsby, in September, during 9.8 rainfall days, 24mm (0.94") of precipitation is typically accumulated. Throughout the year, there are 153.7 rainfall days, and 377mm (14.84") of precipitation is accumulated.Snowfall
In Grimsby, snow does not fall in April through October.Sea temperature
In Grimsby, United Kingdom, in September, the average water temperature is 15.1°C (59.2°F).Note: In water of 15.1°C (59.2°F), the majority of people do not enjoy swimming. Breathing becomes increasingly hard to manage as the temperature drops from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day is 12h and 41min.On the first day of the month, sunrise is at 6:10 am and sunset at 7:49 pm. On the last day of September, in Grimsby, sunrise is at 7:01 am and sunset at 6:39 pm BST.
Sunshine
The average sunshine in September is 7h.UV index
In September, the average daily maximum UV index in Grimsby, United Kingdom, is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Undertake precautions - Obligation exists to protect against skin and eye damage. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grimsby, United Kingdom
- Average high temperature in September: 17.2°C
The warmest month (with the highest average high temperature) is August (19.5°C).
The month with the lowest average high temperature is January (6.4°C).
- Average low temperature in September: 12.1°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).
Average pressure in September
Grimsby, United Kingdom
- Average pressure in September: 1015.6mbar
The month with the highest atmospheric pressure is May (1016.3mbar).
The month with the lowest atmospheric pressure is November (1009.2mbar).
Average wind speed in September
Grimsby, United Kingdom
- Average wind speed in September: 17.2km/h
The windiest month (with the highest average wind speed) is December (23.4km/h).
The calmest month (with the lowest average wind speed) is July (15.3km/h).
Average humidity in September
Grimsby, United Kingdom
- Average humidity in September: 79%
The month with the highest relative humidity is December (86%).
The month with the lowest relative humidity is August (76%).
Average rainfall in September
Grimsby, United Kingdom
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is October (45mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in September
Grimsby, United Kingdom
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is September (9.8 days).
Average snowfall in September
Grimsby, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (16mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Grimsby, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Grimsby, United Kingdom
- Average sea temperature in September: 15.1°C
The best month for swimming (with the highest average sea temperature) is August (15.7°C).
The coldest months (with the lowest average sea temperature) are February and March (6.6°C).
Average daylight in September /
Average sunshine in September
Grimsby, United Kingdom
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 7h and 0min
The month with the most sunshine is August (Average sunshine: 7h and 48min).
The months with the least sunshine are February and November (Average sunshine: 3h and 42min).
Average sunshine days in September
Grimsby, United Kingdom
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is September (17.3 days).
The month with the least sunshine days is July (12.4 days).
Average UV index in September
Grimsby, 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
Grimsby, United Kingdom
- Average cloud cover in September: 49
The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are April, August and September (Cloud cover 49).
Average visibility in September
Grimsby, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, August, September and October (10km).
The months with the lowest visibility are January, May, June, July, November and December (9km).
