September weather forecast
Chesham, United Kingdom

September

Weather in September

September, the first month of the autumn in Chesham, is also an enjoyable month, with an average temperature ranging between min 10.7°C (51.3°F) and max 18.5°C (65.3°F).

Temperature

Chesham notes an average high-temperature of a refreshing 18.5°C (65.3°F) in September, hardly diverging from August. September nights are marked by an average low-temperature of 10.7°C (51.3°F).

Humidity

In September, the average relative humidity in Chesham is 79%.

Rainfall

In Chesham, during September, the rain falls for 9.3 days and regularly aggregates up to 14mm (0.55") of precipitation. Throughout the year, there are 140.9 rainfall days, and 239mm (9.41") of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Chesham.

Daylight

In September, the average length of the day is 12h and 38min.
On the first day of the month, sunrise is at 6:15 am and sunset at 7:48 pm. On the last day of September, in Chesham, United Kingdom, sunrise is at 7:02 am and sunset at 6:42 pm BST.

Sunshine

In Chesham, United Kingdom, the average sunshine in September is 7.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.

Frequently asked questions

What is the temperature in September in Chesham?
In Chesham, in September, the average high-temperature is 18.5°C (65.3°F), and the average low-temperature is 10.7°C (51.3°F).
What is the average humidity in September in Chesham?
In September, the average relative humidity in Chesham is 79%.
How much does it rain in Chesham in September?
In Chesham, during September, the rain falls for 9.3 days and regularly aggregates up to 14mm (0.55") of precipitation.
When it does not snow in Chesham?
In Chesham, United Kingdom, snow does not fall in April through November.
What is the average length of the day in September in Chesham?
The average day length in September is 12h and 38min.
When are sunrise and sunset in September in Chesham?
In September, on the first day of the month, sunrise is at 6:15 am and sunset at 7:48 pm. On the last day of the month, in Chesham, sunrise is at 7:02 am and sunset at 6:42 pm BST.
How long on average sun shines in September in Chesham?
In September, the average sunshine duration in Chesham is 7.2h.
How high is the UV index in September in Chesham?
In Chesham, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Chesham, United Kingdom
Average temperature in September
Chesham, United Kingdom
  • Average high temperature in September: 18.5°C

The warmest month (with the highest average high temperature) is July (21.6°C).
The month with the lowest average high temperature is January (6.4°C).

  • Average low temperature in September: 10.7°C

The month with the highest average low temperature is August (13.1°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).

Average pressure in September - Chesham, United Kingdom
Average pressure in September
Chesham, United Kingdom
  • Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1010.4mbar).

Average wind speed in September - Chesham, United Kingdom
Average wind speed in September
Chesham, United Kingdom
  • Average wind speed in September: 13km/h

The windiest month (with the highest average wind speed) is February (18.1km/h).
The calmest month (with the lowest average wind speed) is July (12.8km/h).

Average humidity in September - Chesham, United Kingdom
Average humidity in September
Chesham, United Kingdom
  • Average humidity in September: 79%

The month with the highest relative humidity is December (90%).
The months with the lowest relative humidity are July and August (77%).

Average rainfall in September - Chesham, United Kingdom
Average rainfall in September
Chesham, United Kingdom
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is June (31mm).
The driest month (with the least rainfall) is April (13mm).

Average rainfall days in September - Chesham, United Kingdom
Average rainfall days in September
Chesham, United Kingdom
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is July (14.2 days).
The months with the least rainy days are February and September (9.3 days).

Average snowfall in September - Chesham, United Kingdom
Average snowfall in September
Chesham, United Kingdom
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in September - Chesham, United Kingdom
Average snowfall days in September
Chesham, United Kingdom
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.3 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 - Chesham, United Kingdom
Average daylight in September /
Average sunshine in September
Chesham, 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: 7h and 1min

The month with the most sunshine is July (Average sunshine: 8h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).

Average sunshine days in September - Chesham, United Kingdom
Average sunshine days in September
Chesham, United Kingdom
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is September (17.4 days).
The month with the least sunshine days is August (12.7 days).

Average UV index in September - Chesham, United Kingdom
Average UV index in September
Chesham, 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 - Chesham, United Kingdom
Average cloud cover in September
Chesham, United Kingdom
  • Average cloud cover in September: 49

The month with the most cloud cover is November (Cloud cover 61).
The months with the least cloud cover are April and September (Cloud cover 49).

Average visibility in September - Chesham, United Kingdom
Average visibility in September
Chesham, United Kingdom
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).

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