September weather forecast
Slough, United Kingdom

September

Weather in September

The first month of the autumn, September, is also an enjoyable month in Slough, United Kingdom, with an average temperature varying between 10.5°C (50.9°F) and 18.5°C (65.3°F).

Temperature

The dawn of September sees an average high-temperature of a refreshing 18.5°C (65.3°F), subtly contrasting with August's 21.2°C (70.2°F). The average temperature during September nights dips to a cool 10.5°C (50.9°F).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Slough, in September, during 9.9 rainfall days, 17mm (0.67") of precipitation is typically accumulated. Throughout the year, there are 149.7 rainfall days, and 270mm (10.63") of precipitation is accumulated.

Snowfall

In Slough, snow does not fall in April through November.

Daylight

In September, the average length of the day in Slough 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 Slough, sunrise is at 7:02 am and sunset at 6:42 pm BST.

Sunshine

The average sunshine in September is 7.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interprets into the following advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.

Frequently asked questions

What are September temperatures in Slough?
An average high-temperature, in September, in Slough, is 18.5°C (65.3°F) and the average low-temperature is 10.5°C (50.9°F).
What is the average humidity in September in Slough?
In Slough, United Kingdom, the average relative humidity in September is 79%.
How many days does it rain in September in Slough?
In September, in Slough, United Kingdom, the rain falls for 9.9 days. Throughout September, 17mm (0.67") of precipitation is accumulated.
When it does not snow in Slough?
In Slough, United Kingdom, snow does not fall in April through November.
How many hours of daylight does Slough have in September?
In Slough, the average day length in September is 12h and 38min.
When are sunrise and sunset in September in Slough?
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, sunrise is at 7:02 am and sunset at 6:42 pm BST.
How long on average sun shines in September in Slough?
In Slough, United Kingdom, the average sunshine duration in September is 7.1h.
What is the UV index reading in September in Slough?
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's 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 - Slough, United Kingdom
Average temperature in September
Slough, United Kingdom
  • Average high temperature in September: 18.5°C

The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (6.6°C).

  • Average low temperature in September: 10.5°C

The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).

Average pressure in September - Slough, United Kingdom
Average pressure in September
Slough, United Kingdom
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.4mbar).

Average wind speed in September - Slough, United Kingdom
Average wind speed in September
Slough, United Kingdom
  • Average wind speed in September: 12.8km/h

The windiest month (with the highest average wind speed) is February (17.7km/h).
The calmest months (with the lowest average wind speed) are July and September (12.8km/h).

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

The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (76%).

Average rainfall in September - Slough, United Kingdom
Average rainfall in September
Slough, United Kingdom
  • Average rainfall in September: 17mm

The wettest month (with the highest rainfall) is June (34mm).
The driest month (with the least rainfall) is April (16mm).

Average rainfall days in September - Slough, United Kingdom
Average rainfall days in September
Slough, United Kingdom
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is September (9.9 days).

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

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

Average snowfall days in September - Slough, United Kingdom
Average snowfall days in September
Slough, 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 - Slough, United Kingdom
Average daylight in September /
Average sunshine in September
Slough, 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: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).

Average sunshine days in September - Slough, United Kingdom
Average sunshine days in September
Slough, United Kingdom
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is July (10.9 days).

Average UV index in September - Slough, United Kingdom
Average UV index in September
Slough, 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 - Slough, United Kingdom
Average cloud cover in September
Slough, United Kingdom
  • Average cloud cover in September: 50

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

Average visibility in September - Slough, United Kingdom
Average visibility in September
Slough, 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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