Last updated: August 31, 2025
In September, Mission Bay, New Zealand experiences a refreshing transition into spring, with maximum temperatures reaching a comfortable 20°C (68°F) and averaging 13°C (56°F). While the minimum temperature dips to about 6°C (43°F), the warm days invite outdoor exploration. However, residents and visitors should be prepared for frequent rain, accumulating to 111 mm (4.4 in) over approximately 14 days, and a notable humidity level around 80%. This month offers a vibrant blend of crisp air and lush greens that define the beauty of Mission Bay during this early spring period.
In September, Mission Bay, New Zealand, experiences a gradual transition from winter to spring, with temperatures starting to warm up. The minimum temperature rests at a chilly 6°C (43°F), while the average hovers around a cool 13°C (56°F), and the maximum peaks at a pleasant 20°C (68°F). This month marks the beginning of a refreshing change, as the weather trends show a steady increase from the colder winter months, which typically feature lower averages. As the days lengthen and the sun shines brighter, September invites both locals and visitors to embrace the outdoors, setting the stage for warmer days ahead.
In September, Mission Bay experiences a significant amount of rainfall, with 111 mm (4.4 in) recorded over 14 days—marking a continuation of the wet spell from August. This precipitation places September among the wetter months of the year, establishing it as a time of frequent showers as spring sets in. As we transition from the colder winter months of June and July, which saw over 100 mm of rainfall, September's totals suggest a gradual, although still notable, shift towards milder conditions. Cumulatively, the region has experienced consistent rainfall throughout the winter and into spring, indicating a robust seasonal pattern that supports the lush landscapes of New Zealand. As the frequency of rain begins to taper off in October, the rich September precipitation serves as a vital precursor to the drier months ahead.
In September, Mission Bay experiences a humidity level of 80%, maintaining the trend of elevated moisture that characterizes the late winter and early spring months. Notably, humidity levels have fluctuated throughout the year, peaking in the cooler months of June and July at 82% and 83% respectively, while tapering slightly as summer approaches. This consistent humidity, especially in the 80% range from August to November, suggests a stable climate that supports lush flora and inviting beach days, making Mission Bay a captivating destination as the seasons transition. The blend of warmth and moisture during this period not only enhances the coastal beauty but also contributes to the region's vibrant ecosystem.
September in Mission Bay, New Zealand, marks the transition from winter's moderate UV levels to the increasing intensity of spring. With a UV Index of 7, categorized as high, residents and visitors can expect a burn time of approximately 25 minutes under direct sunlight. This rise in UV exposure is in line with the gradual increase observed from the lower levels in mid-winter, setting the stage for the higher indices approaching summer. As the sun gains strength, it's essential to stay protected and informed. For more detailed information, check out the Mission Bay UV Index.
UV Risk Categories
As September rolls in, Mission Bay, New Zealand, enjoys a delightful 259 hours of sunshine, marking a notable transition from the chill of winter into the warmth of spring. This month's sun hours reflect a steady increase from the drier August, which had 234 hours, signaling not just the arrival of brighter days but also the lengthening of daylight as the year progresses. Interestingly, September's sunshine sets the stage for an impressive surge in light leading into the summer months, as the region prepares to bask in October’s remarkable 284 hours and November’s peak of 306 hours. This trend highlights Mission Bay's distinctive charm, inviting locals and visitors alike to revel in the cheerful embrace of sunny spring days.
September in Mission Bay, New Zealand, brings a notable dip in the likelihood of sunny weather, with only a 38% chance of sunshine. This trend reflects a gradual decline from the sunnier months of winter, where July and August boast higher probabilities of clear skies at 43% and 41%, respectively. As spring approaches, you’ll notice the odds of sunshine continue to decrease into October, plummeting to a mere 28%. While September may not offer a wealth of sunny days, it sets the stage for the impending warmth of spring, making it a transitional month with its own unique charm.
As September unfolds in Mission Bay, New Zealand, daylight begins to stretch once more after the winter months, offering residents approximately 11 hours of light each day. This marks a gradual resurgence from the shorter days of winter, with sunlight shining brighter as the region transitions into spring. Following the 9 hours of daylight in July and August, September's increase heralds a shift toward longer days, setting the stage for October's further expansion to 13 hours. This progression not only signals the refreshing arrival of warmer weather but also invites outdoor activities as nature awakens from its winter slumber.
As September settles over Mission Bay, the winds pick up, maintaining an average speed of 5.6 m/s (13 mph), matching the preceding month of August. This slight uptick is part of an observable trend as winter transitions to spring; from April through August, wind speeds consistently increased, peaking in these two months. The shift in seasons appears to invigorate the atmosphere, characterized by a steady breeze that becomes integral to the coastal experience. Interestingly, following September, a gentle decline occurs into October, where winds drop slightly to 5.5 m/s (12 mph), hinting at a more tranquil phase ahead. Overall, September's winds reflect a vibrant energy, perfect for enjoying the stunning vistas of Mission Bay.
Weather in Mission Bay varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mission Bay, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather tends to be cooler and wetter, with average temperatures around 13°C (56°F) and maximums reaching up to 20°C (68°F). The month sees about 111 mm (4.4 in) of precipitation over 14 days, resulting in a humidity level of 80%. In contrast, January brings warmer temperatures, with an average of 20°C (69°F) and highs of 26°C (79°F). This month typically experiences significantly less rainfall, totaling 56 mm (2.2 in) over just 7 days, while humidity remains slightly lower at 79%. For more details, check Mission Bay weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a chilly 6°C (43°F) at night to a mild 20°C (68°F) during the day, with an average of 13°C (56°F). The month is relatively wet, receiving 111 mm (4.4 in) of precipitation over 14 days, accompanied by high humidity levels at 80%. In contrast, February enjoys warmer temperatures, with nighttime lows of 14°C (57°F) and daytime highs reaching 27°C (80°F), averaging 21°C (70°F). This month is drier, with only 78 mm (3.1 in) of rain over 9 days and a slightly lower humidity of 76%. For a closer look at February weather, check out Mission Bay weather in February.
September tends to be cooler and wetter compared to March, with average temperatures ranging from a chilly 6°C (43°F) to a mild 20°C (68°F). The month experiences significant precipitation, totaling 111 mm (4.4 in) over about 14 days, and humidity levels remain high at 80%. In contrast, March is warmer, with temperatures ranging from a comfortable 13°C (56°F) to a pleasant 25°C (77°F). It also sees less rainfall, with 87 mm (3.4 in) over 13 days, and a lower humidity level of 74%. For more detailed insights, you can check out Mission Bay weather in March.
When comparing the weather in September and April, we notice distinct differences in temperature and precipitation patterns. September typically experiences cooler temperatures, ranging from a minimum of 6°C (43°F) to a maximum of 20°C (68°F), with an average of 13°C (56°F). In contrast, April is generally warmer, boasting a minimum temperature of 11°C (51°F) and soaring to a maximum of 24°C (75°F), giving it an average of 18°C (64°F). Precipitation is fairly similar in both months, with September receiving 111 mm (4.4 in) over 14 days and April slightly less at 100 mm (3.9 in) over 11 days. Notably, September has a higher humidity level of 80% compared to April's 74%. For a more detailed look at the weather during this time, you can check Mission Bay weather in April.
When comparing the weather in September and May, both months exhibit relatively mild temperatures, but May tends to be slightly warmer overall. September's temperatures range from a minimum of 6°C (43°F) to a maximum of 20°C (68°F), with an average temperature of 13°C (56°F). In contrast, May has a minimum temperature of 7°C (45°F) and can reach a maximum of 21°C (70°F), with an average of 15°C (60°F). Precipitation levels are higher in September, reaching 111 mm (4.4 in) over 14 days, compared to May’s 84 mm (3.3 in) over 11 days. Both months share similar humidity levels at 80%. For more detailed insights on May weather specifically, you can refer to Mission Bay weather in May.
In comparing the weather of September and June, we see some interesting similarities and differences. Both months have similar average temperatures, with September ranging from a minimum of 6°C (43°F) to a maximum of 20°C (68°F), while June has slightly warmer temperatures, with a minimum of 7°C (45°F) and a maximum of 19°C (67°F). Precipitation levels are quite comparable as well, with September experiencing 111 mm (4.4 in) over 14 days and June slightly lower at 107 mm (4.2 in) over 12 days. Humidity levels are relatively high in both months, at 80% for September and 82% for June, contributing to a moist atmosphere. For a detailed outlook on June weather specifically, check out Mission Bay weather in June.
In comparing the weather of September and July, September tends to be slightly warmer, with average temperatures reaching 13°C (56°F) compared to July's 12°C (55°F). The maximum temperatures in September also exceed those of July, peaking at 20°C (68°F) against July's maximum of 18°C (64°F). However, both months are quite similar in terms of precipitation, with September receiving 111 mm (4.4 in) over 14 days, while July sees 102 mm (4.0 in) over 13 days. Humidity levels are also fairly close, with September at 80% and July at 83%. This makes for a relatively damp and cool season in both months, ideal for enjoying the lush landscapes. For a closer look at the specifics of July weather, you can refer to Mission Bay weather in July.
In comparing the weather of September and August, we see some notable similarities and differences. Both months feature an average temperature of around 13°C (55°F), but September enjoys slightly higher maximum temperatures at 20°C (68°F) compared to August's 18°C (65°F). Conversely, August has a marginally lower minimum temperature of 7°C (45°F) than September's 6°C (43°F). Precipitation levels are fairly comparable, with September receiving 111 mm (4.4 inches) over 14 days and August experiencing 114 mm (4.5 inches) across 15 days. Humidity remains consistent at 80% for both months. To learn more about the weather in August, refer to Mission Bay weather in August.
September and October present a gradual shift in weather patterns. In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 20°C (68°F), with an average of 13°C (56°F) and significant precipitation of 111 mm (4.4 in) over 14 days, alongside consistent humidity at 80%. In contrast, October sees a slight increase in temperatures, with a minimum of 8°C (47°F) and a maximum of 21°C (71°F), averaging 15°C (59°F). Precipitation decreases to 81 mm (3.2 in) while maintaining the same frequency of rainy days. For more detailed insights on the weather during this month, you can check out Mission Bay weather in October.
In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 20°C (68°F), with an average of 13°C (56°F). The month experiences considerable rainfall, totaling 111 mm (4.4 in) over 14 days, with humidity consistently high at 80%. In contrast, November sees slightly warmer temperatures, with minimums of 11°C (53°F) and maximums reaching 23°C (73°F), averaging 17°C (63°F). Precipitation decreases to 80 mm (3.2 in) across 12 days, while humidity remains stable at 80%. For more detailed insights into November weather specifics, check out Mission Bay weather in November.
In September, the weather is cool with average temperatures hovering around 13°C (56°F), while December brings a warmer climate with averages reaching 19°C (67°F). September typically experiences more rainfall, with 111 mm (4.4 in) over 14 days, compared to December's 72 mm (2.8 in) spread over 12 days. Humidity levels are relatively similar, with September at 80% and December slightly lower at 78%. For those interested in the specific conditions at Mission Bay, you can explore more details here: Mission Bay weather in December.
As September unfolds in Mission Bay, the weather transition is palpable, marking a shift from the chill of winter to the mildness of spring. With average temperatures hovering around a comfortable 13°C, days gradually become warmer, though they still bear the briskness of early spring nights. This month is characterized by frequent rain, with nearly half the days experiencing some precipitation, resulting in the lush, green landscapes that define the region. The high humidity adds a layer of moisture to the air, making it feel more vibrant and alive. If you want to delve deeper into how September weather compares with other times of the year, check out Mission Bay Climate.