September weather forecast and climate
Rochester, United Kingdom

Weather in September

September, the first month of the autumn, in Rochester, is still a comfortable month, with average temperature ranging between max 18.5°C (65.3°F) and min 12.1°C (53.8°F).

Temperature

In Rochester, the average high-temperature is relatively the same as in August - an enjoyable 18.5°C (65.3°F). In September, the average low-temperature is 12.1°C (53.8°F).

Humidity

The average relative humidity in Rochester is 78%.

Rainfall

In Rochester, United Kingdom,, during 12 rainfall days, 27mm (1.06") of precipitation is typically accumulated. Throughout the year, in Rochester, United Kingdom, there are 174.7 rainfall days, and 446mm (17.56") of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Rochester.

Daylight

In September, the average length of the day is 12.6h.

Sunshine

In September, the average sunshine in Rochester is 7.9h.

UV index

In September, the average daily maximum UV index in Rochester, United Kingdom, is 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Rochester?

In September, the average relative humidity in Rochester is 78%.

How much does it rain in Rochester in September?

In September, in Rochester, the rain falls for 12 days. Throughout September, 27mm (1.06") of precipitation is accumulated.

When it does not snow in Rochester?

April through October are months without snowfall in Rochester, United Kingdom.

What is the average length of the day in September in Rochester?

The average length of the day in September in Rochester is 12.6h.

How many hours of sunshine does Rochester have in September?

In Rochester, the average sunshine in September is 7.9h.

What is the UV index intensity in September in Rochester?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Rochester, United Kingdom

Average temperature in September - Rochester, United Kingdom
  • Average high temperature in September: 18.5°C

The warmest months (with the highest average high temperature) are July and August (21.3°C).
The month with the lowest average high temperature is January (6.8°C).

  • Average low temperature in September: 12.1°C

The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).

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Average pressure in September
Rochester, United Kingdom

Average pressure in September - Rochester, United Kingdom
  • Average pressure in September: 1017.1mbar

The month with the highest atmospheric pressure is September (1017.1mbar).
The month with the lowest atmospheric pressure is November (1010.8mbar).

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Average wind speed in September
Rochester, United Kingdom

Average wind speed in September - Rochester, United Kingdom
  • Average wind speed in September: 14.6km/h

The windiest months (with the highest average wind speed) are February and December (19.6km/h).
The calmest month (with the lowest average wind speed) is July (14km/h).

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Average humidity in September
Rochester, United Kingdom

Average humidity in September - Rochester, United Kingdom
  • Average humidity in September: 78%

The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (75%).

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Average rainfall in September
Rochester, United Kingdom

Average rainfall in September - Rochester, United Kingdom
  • Average rainfall in September: 27mm

The wettest month (with the highest rainfall) is December (53mm).
The driest month (with the least rainfall) is April (24mm).

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Average rainfall days in September
Rochester, United Kingdom

Average rainfall days in September - Rochester, United Kingdom
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is November (17.5 days).
The month with the least rainy days is September (12 days).

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Average snowfall in September
Rochester, United Kingdom

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

The month with the highest snowfall is February (26mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in September
Rochester, United Kingdom

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

The month with the highest number of snowfall days is February (3.4 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Rochester, United Kingdom

Average daylight in September / Average sunshine in September - Rochester, United Kingdom
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.5h).
The month with the shortest days is December (Average daylight: 8h).

  • Average sunshine in September: 7.9h

Months with the most sunshine are July and August (Average sunshine: 8.7h).
The month with the least sunshine is February (Average sunshine: 3.7h).

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Average sunshine days in September
Rochester, United Kingdom

Average sunshine days in September - Rochester, United Kingdom
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is November (9.7 days).

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Average UV index in September
Rochester, United Kingdom

Average UV index in September - Rochester, United Kingdom
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Rochester, United Kingdom

Average cloud cover in September - Rochester, United Kingdom
  • Average cloud cover in September: 43

The month with the most cloud cover is February (Cloud cover 60).
Months with the least cloud cover are August and September (Cloud cover 43).

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Average visibility in September
Rochester, United Kingdom

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

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

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