At the Waimakariri River Mouth over the next 24-48 hours, expect easterly winds currently around 12 knots (approximately 12 km/h) with gusts up to 19 knots, increasing overnight to northerly winds near 26 knots with gusts reaching 39 knots. The sea state will be moderate, with swells likely around 1 to 2 meters, coming predominantly from the southeast, with wave periods averaging 8 to 10 seconds. Weather conditions are predicted to be mostly cloudy with a 20-30% chance of light rain, and visibility should remain good to moderate except in rain showers. The sea water temperature is around 11°C, typical for late winter in this region.

River and coastal conditions at the Waimakariri Mouth indicate that river flows are expected to be near normal for this time of year, with no significant flooding risks forecasted though occasional higher river flow may be expected due to upstream rainfall. Sunrise is around 7:15 AM NZST and sunset near 5:40 PM NZST, giving roughly 10.5 hours of daylight. Coastal impacts will mainly be influenced by the increasing northerly winds, which could cause choppier surf and stronger currents near the river mouth and beach areas, so caution is advised for navigation and water activities. There are no current warnings or severe alerts but moderate gusty winds and variable rain could affect short-term visibility and river conditions.