July weather forecast
Saint Peter Port, Guernsey

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A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor
A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor

Weather in July

As the year reaches its zenith, July is the warmest month in Saint Peter Port, Guernsey, with temperatures reaching a peak of 16.9°C (62.4°F). The wind speed reduces somewhat from June, contributing to the warm, summery sensation. Rainfall minimizes to only 26mm (1.02") over fewer rainy days, emphasizing the prevalence of dry, clear summer days. Despite being the peak of summer, the month avoids extreme conditions, enabling an enjoyable and comfortable weather experience.

Temperature

During July, Saint Peter Port observes a subtle ascent to a comfortable 16.9°C (62.4°F) from June's 15.2°C (59.4°F) in the average high-temperature. The July nights in Saint Peter Port show a slight decrease to a mean low-temperature of 15.3°C (59.5°F).

Humidity

June and July, with an average relative humidity of 84%, are the most humid months in Saint Peter Port.

Rainfall

July is the month with the least rainfall in Saint Peter Port. Rain falls for 12.8 days and accumulates 26mm (1.02") of precipitation.

Snowfall

February through December are months without snowfall in Saint Peter Port, Guernsey.

Sea temperature

In Saint Peter Port, in July, the average water temperature is 16°C (60.8°F).
Note: Swimming is not a pleasant activity for most when the water temperature is 16°C (60.8°F). As the water temperature drops from 21°C (69.8°F) to 15°C (59°F), breathing becomes more difficult to control.

Daylight

In Saint Peter Port, the average length of the day in July is 15h and 47min.
On the first day of the month, sunrise is at 05:08 and sunset at 21:20. On the last day of July, in Saint Peter Port, sunrise is at 05:40 and sunset at 20:52 BST.

Sunshine

With an average of 9.7h of sunshine, July has the most sunshine of the year.

UV index

July through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: In July, the maximum UV index of 5 translates into these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. 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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Frequently asked questions

What is the usual temperature for Saint Peter Port in July?

The average high-temperature and low-temperature in Saint Peter Port, Guernsey, during July are 16.9°C (62.4°F) and 15.3°C (59.5°F) respectively.

What is the most humid month in Saint Peter Port?

June and July, with an average relative humidity of 84%, are most humid months.

What is the average humidity in July in Saint Peter Port?

In Saint Peter Port, the average relative humidity in July is 84%.

What is the driest month in Saint Peter Port?

The month with the least rainfall is July, when the rain falls for 12.8 days and typically collects 26mm (1.02") of precipitation.

How many days does it rain in July in Saint Peter Port?

In Saint Peter Port, in July, during 12.8 rainfall days, 26mm (1.02") of precipitation is typically accumulated.

When it does not snow in Saint Peter Port?

In Saint Peter Port, Guernsey, snow does not fall in February through December.

How cold is the water in July in Saint Peter Port?

In Saint Peter Port, in July, the average water temperature is 16°C (60.8°F). For swimming, a surface water temperature of 16°C (60.8°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Saint Peter Port have in July?

In Saint Peter Port, Guernsey, the average day length in July is 15h and 47min.

When is the sunrise / sunset in July in Saint Peter Port?

On the first day of July in Saint Peter Port, Guernsey, sunrise is at 05:08 and sunset at 21:20. On the last day of the month, sunrise is at 05:40 and sunset at 20:52 BST.

What month has the most sunshine in Saint Peter Port?

The month with the most sunshine is July, with an average of 9.7h of sunshine.

How many hours of sunshine does Saint Peter Port have in July?

In July, the average sunshine duration in Saint Peter Port, Guernsey, is 9.7h.

What is the month with the highest UV index in Saint Peter Port?

The months with the highest UV index are July through September, with an average maximum UV index of 5.

What is the UV index intensity in July in Saint Peter Port?

In Saint Peter Port, the average daily maximum UV index in July is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in July
Saint Peter Port, Guernsey

Average temperature in July - Saint Peter Port, Guernsey
  • Average high temperature in July: 16.9°C

The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).

  • Average low temperature in July: 15.3°C

The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).

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Average pressure in July
Saint Peter Port, Guernsey

Average pressure in July - Saint Peter Port, Guernsey
  • Average pressure in July: 1016.7mbar

The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).

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Average wind speed in July
Saint Peter Port, Guernsey

Average wind speed in July - Saint Peter Port, Guernsey
  • Average wind speed in July: 21.9km/h

The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).

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Average humidity in July
Saint Peter Port, Guernsey

Average humidity in July - Saint Peter Port, Guernsey
  • Average humidity in July: 84%

The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).

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Average rainfall in July
Saint Peter Port, Guernsey

Average rainfall in July - Saint Peter Port, Guernsey
  • Average rainfall in July: 26mm

The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).

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Average rainfall days in July
Saint Peter Port, Guernsey

Average rainfall days in July - Saint Peter Port, Guernsey
  • Average rainfall days in July: 12.8 days

The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).

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Average snowfall in July
Saint Peter Port, Guernsey

Average snowfall in July - Saint Peter Port, Guernsey
  • Average snowfall in July: 0mm

The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in July
Saint Peter Port, Guernsey

Average snowfall days in July - Saint Peter Port, Guernsey
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in July
Saint Peter Port, Guernsey

Average sea temperature in July - Saint Peter Port, Guernsey
  • Average sea temperature in July: 16°C

The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).

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Average daylight in July /
Average sunshine in July
Saint Peter Port, Guernsey

Average daylight in July / Average sunshine in July - Saint Peter Port, Guernsey
  • Average daylight in July: 15h and 5min

The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).

  • Average sunshine in July: 9h and 4min

The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).

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Average sunshine days in July
Saint Peter Port, Guernsey

Average sunshine days in July - Saint Peter Port, Guernsey
  • Average sunshine days in July: 15.4 days

The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).

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Average UV index in July
Saint Peter Port, Guernsey

Average UV index in July - Saint Peter Port, Guernsey
  • Average UV index in July: 5

The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).

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Average cloud cover in July
Saint Peter Port, Guernsey

Average cloud cover in July - Saint Peter Port, Guernsey
  • Average cloud cover in July: 37

The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).

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Average visibility in July
Saint Peter Port, Guernsey

Average visibility in July - Saint Peter Port, Guernsey
  • Average visibility in July: 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).

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Saint Peter Port, Guernsey

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