Climate Overview
The climate in Kei Mouth is warm and mild. The average annual temperature is 19°C and approximately 775mm of precipitation falls per year. March is the wettest month, receiving around 115mm of rainfall. Kei Mouth 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: February, January, March. The coldest months are August, July, June, when temperatures can drop to 12°C.
Temperature
Kei Mouth sees moderate temperature variation throughout the year, ranging from 12°C to 26°C. The warmest month is February, when average highs reach 26°C and the mean temperature sits around 22°C. August is the coolest month, with minimum temperatures around 12°C and an average of 16°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.
Precipitation
Kei Mouth is a relatively dry area, receiving approximately 775mm of precipitation annually, which averages out to around 65mm per month. The wettest month is March, averaging 115mm of rainfall. February and April also tend to see above-average precipitation. The driest month is June, with just 12mm. That's 103mm less than March, 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.
Wind
Kei Mouth is relatively calm, with an average annual wind speed of 4km/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 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.
Seasons
3 days until Winter
It is currently autumn in Kei Mouth, which began on March 20, 2026. Kei Mouth is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 26°C, while the coldest stretch bottoms out in August near 12°C. Winter is next, beginning on June 21, 2026 — 3 days from now.
Spring
Temperatures range from 13 to 23°C. Precipitation is moderate at around 200mm for the season, averaging 67mm per month. Winds are generally light, averaging 4km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 18 to 26°C. Precipitation is moderate at around 263mm for the season, averaging 88mm per month. Winds are generally light, averaging 4km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 14 to 25°C. Precipitation is moderate at around 242mm for the season, averaging 81mm per month. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 12 to 23°C. Rainfall is relatively light, with around 70mm over the season and a monthly average of 23mm. Winds are generally light, averaging 4km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Kei Mouth is during January, April, May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 56mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 26°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Kei Mouth 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.
