Wight, where it's located

The climate of Wight is oceanic, with quite cold, rainy winters and mild, relatively rainy summers. However, the south coast of England, where Wight is located, has a mild and sunny microclimate, compared to the rest of Great Britain.
Wight is a small island located a short distance from the south coast of England.
In Shanklin, the average temperature of the coldest month (February) is of 5.4 °C (42 °F), that of the warmest month (August) is of 17 °C (63 °F). Here are the average temperatures.
Shanklin - Average temperatures
Min (°C)43458111314121064
Max (°C)881012161820201815119
Min (°F)393739414652555754504339
Max (°F)464650546164686864595248

Precipitation amounts to 870 millimeters (34.3 inches) per year: so, it is at an intermediate level. It ranges from 45 mm (1.8 in) in the driest months (June, July) to 115 mm (4.5 in) in the wettest (October). Here is the average precipitation.
Shanklin - Average precipitation

On average, there are around 1,925 sunshine hours per year: we are at the highest levels in Britain. Here are the average sunshine hours per day.
Shanklin - Sunshine

The sea temperature ranges between 8 °C (46 °F) and 17 °C (63 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.
Shanklin - Sea temperature
Temp (°C)98891113151717161311
Temp (°F)484646485255596363615552


Best Time

The best time to visit Wight is the summer, from June to August, since it is the warmest of the year, although even in this season, it's better to bring a sweatshirt, a light jacket and an umbrella. The month of June is a bit cooler, so you may prefer July and August. September is a good month as well: it's a bit rainier than the summer months, but the temperatures are still pleasant, especially in the first part.
As previously mentioned, the sea is very cool even in summer, however, on sunny days, when the breeze is not too cool, you can sunbathe.