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
September
Weather in September
Temperature
September's advent presents an average high-temperature of a comfortable 17.7°C (63.9°F), indicating a slight variation from the conditions of the previous month. The nighttime temperature demonstrates a marginal decline, averaging at a mild 13.8°C (56.8°F) during September.Humidity
In Harwich, the average relative humidity in September is 77%.Rainfall
In Harwich, in September, it is raining for 11.8 days, with typically 26mm (1.02") of accumulated precipitation. In Harwich, during the entire year, the rain falls for 168.5 days and collects up to 389mm (15.31") of precipitation.Snowfall
April through October are months without snowfall.Sea temperature
September is the month with the warmest seawater, with an average sea temperature of 17.7°C (63.9°F).Note: In 17.7°C (63.9°F), swimming is not an enjoyable activity for most. As the temperature decreases from 21°C (69.8°F) to 15°C (59°F), it becomes harder to control breathing.
Daylight
In September, the average length of the day is 12h and 39min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:41 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:34 pm BST.
Sunshine
In Harwich, the average sunshine in September is 8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Guard yourself - Precautionary measures against sun damage are advocated. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
When is the sea warmest?
What is the sea temperature in September?
What is the average length of the day in September?
What time are sunrise and sunset in September in Harwich?
How many hours of sunshine does Harwich have in September?
What is the UV index intensity in September in Harwich?
Average temperature in September
Harwich, United Kingdom
- Average high temperature in September: 17.7°C
The warmest month (with the highest average high temperature) is August (20°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 13.8°C
The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (4°C).
Average pressure in September
Harwich, United Kingdom
- Average pressure in September: 1016.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1010.5mbar).
Average wind speed in September
Harwich, United Kingdom
- Average wind speed in September: 19.6km/h
The windiest month (with the highest average wind speed) is December (26.4km/h).
The calmest month (with the lowest average wind speed) is July (17.2km/h).
Average humidity in September
Harwich, United Kingdom
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (84%).
The month with the lowest relative humidity is August (76%).
Average rainfall in September
Harwich, United Kingdom
- Average rainfall in September: 26mm
The wettest month (with the highest rainfall) is October (46mm).
The driest month (with the least rainfall) is April (16mm).
Average rainfall days in September
Harwich, United Kingdom
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is September (11.8 days).
Average snowfall in September
Harwich, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (22mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Harwich, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Harwich, United Kingdom
- Average sea temperature in September: 17.7°C
The best month for swimming (with the highest average sea temperature) is September (17.7°C).
The coldest month (with the lowest average sea temperature) is March (7.2°C).
Average daylight in September /
Average sunshine in September
Harwich, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is August (Average sunshine: 9h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Harwich, United Kingdom
- Average sunshine days in September: 15.1 days
The months with the most sunshine days are April and September (15.1 days).
The month with the least sunshine days is February (11.1 days).
Average UV index in September
Harwich, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June and 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
Harwich, United Kingdom
- Average cloud cover in September: 41
The month with the most cloud cover is February (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 41).
Average visibility in September
Harwich, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
