Climate Insights for Ngatiarua
Atiu, Cook Islands
Climate Overview
The climate in Ngatiarua is hot. The average annual temperature is 25°C and approximately 1,880 mm of precipitation falls per year. Ngatiarua receives a notable amount of rainfall throughout the year, including during its driest month. Ngatiarua is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: March, February, January. The coldest months are August, September, July, when temperatures can drop to 23°C.The climate in Ngatiarua is hot. The average annual temperature is 77°F and approximately 74 in of precipitation falls per year. Ngatiarua receives a notable amount of rainfall throughout the year, including during its driest month. Ngatiarua is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: March, February, January. The coldest months are August, September, July, when temperatures can drop to 74°F.
Temperature
Ngatiarua has relatively stable temperatures year-round, staying within a 4°C range. The warmest month is March, when average highs reach 27°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 23°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.Ngatiarua has relatively stable temperatures year-round, staying within a 7°F range. The warmest month is March, when average highs reach 81°F and the mean temperature sits around 80°F. August is the coolest month, with minimum temperatures around 74°F and an average of 75°F. Daily temperature variation is modest, with an average difference of 2°F between highs and lows.
Precipitation
Ngatiarua is a fairly wet location, receiving approximately 1,880 mm of precipitation annually, which averages out to around 157 mm per month. The wettest month is December, averaging 279 mm of rainfall. January and February also tend to see above-average precipitation. The driest month is June, with just 76 mm. That's 203 mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.Ngatiarua is a fairly wet location, receiving approximately 74 in of precipitation annually, which averages out to around 6.2 in per month. The wettest month is December, averaging 11 in of rainfall. January and February also tend to see above-average precipitation. The driest month is June, with just 3 in. That's 8 in less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Ngatiarua is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 26km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in March, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 25km/h in winter, 25km/h in spring, 21km/h in summer, 22km/h in autumn.Ngatiarua is very windy, with an average annual wind speed of 14mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is October, averaging 16mph, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in March, with average winds dropping to 11mph, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5mph gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 15mph in winter, 16mph in spring, 13mph in summer, 13mph in autumn.
Best Time to Visit
The best time to visit Ngatiarua is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 81 mm per month. By contrast, March can be uncomfortably hot with temperatures reaching 27°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 best time to visit Ngatiarua is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 75°F with modest rainfall averaging 3.2 in per month. By contrast, March can be uncomfortably hot with temperatures reaching 81°F. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for Ngatiarua 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. 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.The table below shows monthly climate averages for Ngatiarua based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Fahrenheit (°F). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in miles per hour (mph). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.