Climate and monthly weather forecast
Blenheim, New Zealand

Blenheim, New Zealand adheres to the Köppen climate classification of Cfb, referring to a Marine west coast climate with a warm summer. This geographical location situates it within a zone that endures a weather pattern typified by temperate conditions throughout the four seasons, devoid of extreme variations in temperature.

Throughout the year, temperature fluctuations remain considerable with monthly highs varying from 12.6°C (54.7°F) in July to 24.1°C (75.4°F) observed in January. Correspondingly, the monthly lows vacillate somewhere between 1.5°C (34.7°F) in July and 11.8°C (53.2°F) in January. It is worth noting the significant difference in temperatures within the same month, suggestive of a need for a versatile wardrobe in Blenheim.

Blenheim also witnesses a considerable fluctuation in rainfall, with the highest average precipitation recorded at 74mm (2.91") in July and the lowest at 47mm (1.85") in March. Simultaneously, average number of rainfall days range from 5 days in January to 8.5 days in September, indicating the variability of rainy days across the year.

The amount of daylight availability adjusts throughout the year as well, showing greater variation from 9.2 hours in June, escalating to 15.1 hours in December. Consequently, Blenheim’s environment is richly bestowed upon varying degree of sunlight from 5.1 hours per day in June and July to 8 hours per day in January.

Given its temperate climate, the best time to visit Blenheim typically aligns with the seasons of summer and autumn. For optimum conditions, consider a trip from December to May, when temperatures oscillate from 18°C (64.4°F) to 24.1°C (75.4°F) and rainfall averages remain between 49mm (1.93") to 61mm (2.4"). This period also coincides with significant daylight availability, ranging from 9.8 hours to 15.1 hours, providing an ample window for outdoor exploration and vineyard visits.

The winter months from June to August register as the less preferable time to visit Blenheim due to colder temperature ranges, from 1.5°C (34.7°F) to 13.8°C (56.8°F), and reduced daylight hours, from 9.2 hours to 10.5 hours. Correspondingly, this period witnesses a surge in average rainfall, reaching its maximum at 71mm (2.8") to 74mm (2.91"). With an increased number of rainfall days, these weather conditions may hinder outdoor activities.

Blenheim’s spring from September to November showcases an atmosphere of gradual warming with temperatures shifting from 15.8°C (60.4°F) to 21.9°C (71.4°F) for highs and 4.7°C (40.5°F) to 9.8°C (49.6°F) for lows. A noticeable increase in daylight hours happens, moving from 11.8 hours to 14.4 hours. However, rainfall is still a factor with average precipitation varying from 55mm (2.17") to 67mm (2.64") and average number of rainfall days floating from 6.9 days to 8.5 days.

Summers in Blenheim, from December to February, witness the warmest temperatures with highs oscillating from 21.9°C (71.4°F) to 24.1°C (75.4°F) and lows varying from 9.8°C (49.6°F) to 11.8°C (53.2°F). The summer season, being the sunniest, offers maximum daylight hours between 14.5 hours to 15.1 hours and abundant sunshine hours within the range of 7.8 hours to 8 hours. Rainfall during these months remains relatively lower too, with values tracing a path from 47mm (1.85") to 49mm (1.93").

Autumn, stretching from March to May, promises temperate conditions with corresponding high temperatures oscillating from 16°C (60.8°F) to 21.9°C (71.4°F) and low temperatures moving between 4.5°C (40.1°F) to 9.8°C (49.6°F). The daylight hours noticeably decrease during the season, transitioning from 13.2 hours to 9.8 hours. Rainfall tends to increase from 53mm (2.09") to 61mm (2.4"), with the number of rainfall days varying from 5.3 days to 6.7 days.

Winter months of June, July, and August mark the period of lowest temperatures in Blenheim, depicting a downward trend with highs shifting from 13.3°C (55.9°F) to 12.6°C (54.7°F) and lows touching a minimum of 1.5°C (34.7°F) in July. The daylight hours register a comparable decrease from 9.8 hours in June downwards to 9.2 hours in June. Average precipitation reaches its maximum value during this season, fluctuating from 62mm (2.44") to 74mm (2.91"), and average number of rainfall days elevating to 7.6 days to 8 days.

January stakes a claim as the hottest month in Blenheim, New Zealand. With high temperatures soaring all the way up to 24.1°C (75.4°F), anyone venturing outside will feel the summer's warmth. This month traditionally kicks off with bright and sunny days illuminating the city. Weather in January »

In comparison to January, February in Blenheim experiences a slight decline in temperatures but continues to bear the essence of summer. An observer might note a minor increase in humidity, clocking in at 74.2%. Despite the slightly cooler temperatures, February still reserves assertive warmth and vibrancy. Weather in February »

March, a transition phase between summer and autumn, sees a more noticeable drop in temperature. It tends to maintain a balance, offering residents and visitors a mix of remaining summer warmth and an upcoming autumn chill. The volume of rainfall increases, reaching 47mm (1.85"), but does not substantially affect the overall weather harmony. Weather in March »

April brings with it noticeable changes in Blenheim's weather scene due to the advent of autumn. With temperatures falling to the 19°C (66.2°F) range, the city starts to experience the familiar autumn chill. Increased rainfall of 53mm (2.09") accompanies the decrease in temperature, setting the city's weather rhythm to a cooler and wetter tune. Weather in April »

As the fifth month of the year, May further descends into the colder temperatures that are characteristic of late autumn. The fall in temperature down to 16°C (60.8°F) on average, coincides with a surge in relative humidity up to 81.5%. Weather in May »

June is indicative of the onset of winter in Blenheim, with temperatures sinking to an average of 13.3°C (55.9°F), the second lowest in the year. Month on month, it receives more rainfall, totaling 71mm (2.8"). The overcast sky and downpours shape a weather pattern dominated by grayer hues and colder winds. Weather in June »

July holds the title for hosting the coldest temperatures in Blenheim, with the mercury plummeting to an average of 12.6°C (54.7°F). A minor surge in the number of rainy days to 7.6 further escalates the winter feel. The combination of cold temperatures, highest relative humidity, and minimal daylight hours shapes a winter landscape. Weather in July »

August joins the winter months club with temperatures dipping to an average of 13.8°C (56.8°F). Though slightly warmer than July, August exhibits a decrease in rainfall to 62mm (2.44"), maintaining the winter streak. It can be noted that the decline in rainfall is accompanied by an increase in the amount of daylight. Weather in August »

September breaks away from the winter spell, introducing the first touch of spring in Blenheim. With temperatures jumping to an average of 15.8°C (60.4°F), the city begins to warm up after enduring the colder months. A dip in the relative humidity from 80.8% to 73.3% ensures a comfortable atmosphere. Weather in September »

October in Blenheim guarantees a steady transition into the warmth of spring. The temperature registers an upward trend, encouraging people to indulge in outdoor activities. The rainfall, albeit peaking at 67mm (2.64"), is generally not a deterrent due to the relatively comfortable temperature. Weather in October »

November ushers in the late springtime with ever-increasing temperatures, preparing to embrace the summer. The city of Blenheim sees a visible increase in the overall warmness, enhancing the balminess of the weather. A dip in rainfall from 67mm (2.64") to 55mm (2.17") makes the month dry, contributing to the overall pleasant weather. Weather in November »

Blenheim ushers in December, marking the arrival of early summer. Temperatures go up to an average high of 22.2°C (72°F), intensifying the sunny disposition of the city. The humidity levels lower to 67.5%, generating a pleasantly warm atmosphere. Weather in December »