It might be stating the obvious but, the weather in Sifnos is typically Mediterranean. A very temperate climate, with winters that are sometimes a little wet and windy but generally mild. The summer months are hot and dry.
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The weather by month
Cold, rainy and windy. There is a one-week period during January when the weather is generally good and the winds cease. This period is called the Halcyon Days.
Slightly warmer and sunnier than January. The the first trees begin to bloom
Sometimes cold and windy but there are many sunny days too. In March 2001 there was a heat wave with temperatures as high as 30 °C but that was an exception.
Spring time in Sifnos with medium temperatures and low rainfall. Sifnos is full of wildflowers and is magnificent. The first daring swimmers appear.
Warm and sunny. Rain is unlikely to occur past May 10. The meltemi seasonal North winds have not yet started to blow, the sea is calm and nature is at its best. May is considered the best month for outdoors activities. A jacket will prove useful for the night.
Sunny and warm. Time for the beach!
Sometime a little windy but very hot. July and August are the months that the seasonal North winds blow. It is hard to do anything else during these months, than spend the entire day at the beach. Look for a shady place and drink plenty of water. Do not forget your hat and sunscreen.
Sunny, less windy and slightly cooler. Good for outdoors activities. Get a light jacket for the night, especially if you plan to visit any mountainous areas.
Sunny, very few windy days but some rain might fall. Good for outdoors activities. Warm clothes are rarely necessary.
The weather becomes unpredictable. It may be sunny but there are plenty of rainy and windy days too. Pack a sweater and don't forget your umbrella.
Conditions vary from year to year with a mixture of windy, calm, rainy, sunny, cold and warm days. Pack some warm clothes. There are days when the temperature makes swimming possible and pleasurable for some!