Climate Insights for Castel San Giovanni

The climate in Castel San Giovanni is temperate. The average annual temperature is 14°C and approximately 1028mm of precipitation falls per year. Castel San Giovanni receives a notable amount of rainfall throughout the year, including during its driest month. Castel San Giovanni is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to 1°C. Light snow can occur between January and December.

Temperatures in Castel San Giovanni vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 30°C and the mean temperature sits around 25°C. January is the coolest month, with minimum temperatures around 1°C and an average of 4°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Castel San Giovanni is a moderately rainy area, receiving approximately 1028mm of precipitation annually, which averages out to around 86mm per month. The wettest month is May, averaging 127mm of rainfall. October and November also tend to see above-average precipitation. The driest month is January, with just 51mm. That's 76mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 39cm annually. December is the snowiest month with approximately 15cm.

Castel San Giovanni is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently summer in Castel San Giovanni, which began on June 21, 2026. Castel San Giovanni is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 30°C, while the coldest stretch bottoms out in January near 1°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Castel San Giovanni is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 82mm per month. By contrast, January can be quite cold with temperatures dropping to 1°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Castel San Giovanni based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.