September weather forecastDereham, United Kingdom
September
Weather in September
September, the first month of the autumn in Dereham, is still a comfortable month, with an average temperature fluctuating between 12.6°C (54.7°F) and 17.3°C (63.1°F).Temperature
September records an average high-temperature of a still comfortable 17.3°C (63.1°F), indicating a minor variation from the preceding month. Dereham's nighttime average temperature in September subtly descends to a cool 12.6°C (54.7°F) from the daily highs.Humidity
The average relative humidity in September is 79%.Rainfall
In September, the rain falls for 12.2 days. Throughout September, 31mm (1.22") of precipitation is accumulated. In Dereham, during the entire year, the rain falls for 169.2 days and collects up to 430mm (16.93") of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Dereham, the average length of the day in September is 12h and 40min.On the first day of September in Dereham, United Kingdom, sunrise is at 6:07 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:35 pm BST.
Sunshine
In Dereham, the average sunshine in September is 7.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dereham, United Kingdom
- Average high temperature in September: 17.3°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 (6.3°C).
- Average low temperature in September: 12.6°C
The month with the highest average low temperature is August (14.5°C).
The coldest month (with the lowest average low temperature) is February (3.4°C).
Average pressure in September
Dereham, United Kingdom
- Average pressure in September: 1016.1mbar
The month with the highest atmospheric pressure is May (1016.5mbar).
The month with the lowest atmospheric pressure is November (1009.7mbar).
Average wind speed in September
Dereham, United Kingdom
- Average wind speed in September: 18km/h
The windiest month (with the highest average wind speed) is December (24.8km/h).
The calmest month (with the lowest average wind speed) is July (15.3km/h).
Average humidity in September
Dereham, 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 (78%).
Average rainfall in September
Dereham, United Kingdom
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is June (53mm).
The driest month (with the least rainfall) is April (20mm).
Average rainfall days in September
Dereham, United Kingdom
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (11.3 days).
Average snowfall in September
Dereham, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (16mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Dereham, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 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
Dereham, United Kingdom
- Average daylight in September: 12h and 42min
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: 7h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Dereham, United Kingdom
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is March (15.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Dereham, 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
Dereham, United Kingdom
- Average cloud cover in September: 44
The months with the most cloud cover are January and February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 43).
Average visibility in September
Dereham, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
