Climate Insights for Iona

The climate in Iona is cool. The average annual temperature is 7°C and approximately 635mm of precipitation falls per year. January is the wettest month, receiving around 76mm of rainfall. Iona 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 December, January, February, when temperatures can drop to -10°C. Iona experiences heavy snowfall, typically from January through December.

Iona has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 21°C. The coldest month is December, when overnight lows fall to -10°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 9°C shift in average temperatures.

Iona is a relatively dry area, receiving approximately 635mm of precipitation annually, which averages out to around 53mm per month. The wettest month is January, averaging 76mm of rainfall. April and February also tend to see above-average precipitation. The driest month is August, with just 10mm. That's 66mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Iona receives heavy snowfall, accumulating around 290cm annually from January through December. The snowiest month is January, with approximately 72cm. Winter travel should account for significant snow cover.

Iona is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently spring in Iona, which began on March 20, 2026. Iona 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 29°C, while the coldest stretch bottoms out in December near -10°C. Summer is next, beginning on June 21, 2026 — 1 days from now.

The best time to visit Iona is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 22mm per month. By contrast, December can be quite cold with temperatures dropping to -10°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Iona 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.