Wet roads and high winds mean scooter and motorbike riders are particularly vulnerable, and car stopping distances considerable greater than in dry weather.
Police are also asking drivers to pay more attention to fellow road users.
At the weekend a minor crash occurred at Arorangi on Saturday morning involving two motorbikes. One driver required attention for a cut leg. The other driver left the scene, but police have tracked the registered owner of the motorbike.
On Friday night, a crash at the Punanga Nui Market resulted in the breath-testing of a motorbike rider.
Earlier in the day, a collision occurred at the Avatiu Harbour where a truck struck a man on a motorbike. He was taken to hospital for medical attention.
And in the early hours of Friday, two people on a motorbike struck a dog with the driver sustaining minor leg injuries.
Police would also remind people to be vigilant of their property and that of their neighbours, despite reported incidents of burglary dropping during October.
The Cook Islands Police Service says vulnerabilities and risks are ongoing, particularly around holiday homes.
A break-in occurred at a Vaimaanga holiday facility during the weekend where belongings were taken while occupants slept.
The complaint was filed early on Sunday morning after the discovery of an open door and missing phone and other items.
“Precautions and vigilance is necessary in and around all properties, including the safe storage of any valuables, phones and other small electronic devices.
“Secure doors and windows and don’t be complacent about apparent peaceful surroundings.”
The weekend arrest cases involved the charging of an 18-year-old male with the unlawful taking of a motorbike. He was arrested on Saturday morning and will appear in court this week.
On Thursday prior to the long weekend, one man was arrested on a cannabis charge and another for contempt of court.