Portsmouth weather is classified as mild temperate, and is characteristically warm and sunny during the summer season, veering towards significantly cooler conditions when winter rolls in.

Due to its coastal surroundings, the city of Portsmouth directly avoids the worst of the northerly winds; this is due to its protection by the Ports-down-Hill, and this reflects in its higher than expected monthly temperatures.

Weather in Portsmouth is occasionally unpredictable, a factor most evident in the fact that the city experiences an abundance of rainy weather throughout the year. The annual average precipitation at Portsmouth is 48.13 Inches. Rainfall is practically equally distributed throughout the year. The wettest month of the year is November with an average rainfall of 4.86 Inches.

Summer Portsmouth weather is characterized by high temperatures, occasionally soaring to levels not experienced at other south coast neighboring cities. This is due to the influence of the "urban heat effect", where heat is reflected and retained by surrounding buildings, helping the evening to stay warm.

Positioned on the south coast, Portsmouth furthermore receives additional sunshine, and certainly more during the year than most of the United Kingdom. The average daily high temperature in July is 23C, with the regular minimum being 15C; the record high temperature is 35C. As warm and sunny Portsmouth weather can be, wet and overcast days during the months of June, July, and August are expected from time to time. Although these wet spells have the tendency to quickly disappear, on occasion dampness lingers for a week.

Portsmouth weather during the winter is characteristically mild to cool; winter frostiness is light and short-lived with snow being quite rare. Temperatures on the odd occasion fall below freezing point due to the fact that the city of Portsmouth is surrounded by water and is heavily populated. During the winter months Ports –down-hill acts as the city’s protective shield against the breezy northerly winds. The average maximum temperature for January is 10C with the average minimum being 5C, while lows of -6C have also been recorded.

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