Climate averages 1991–2020

Bunbury weather
in September.

A mild, moderately wet month: the joint 9th warmest and the 8th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 16.8°C Daytime mean, September

Average low 10.0°C Night-time mean, September

Rainfall 74 mm 10 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a mild month in Bunbury: daytime highs average 16.8°C and nights cool to about 10.0°C. By daytime temperature it is the joint 9th warmest of the 12 months.

Expect about 74 mm of rain on roughly 10 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average September day.

The nearest other city in this atlas is Mandurah (89 km away). In September its highs average 17.8°C, 1.0°C warmer than Bunbury, with 64 mm of rain.

Among the 32 cities listed in Australia, Bunbury ranks 22nd of 32 for the warmest September highs and 31st of 32 for the driest September (rainfall, lowest first). The mean September high of those 32 cities is 20.0°C; Bunbury is 3.2°C cooler than that mean.

From September to October, average highs rise by 2.7°C to 19.5°C, and monthly rainfall falls from 74 mm to 34 mm.

The annual picture

September in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Bunbury climate table

1991–2020

Monthly climate averages for Bunbury, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	28.4°C16.8°C	16.8°C	11	1.9	14.114 h
February	28.5°C17.2°C	17.2°C	13	1.6	13.313 h
March	26.3°C16.3°C	16.3°C	22	3.1	12.312 h
April	22.8°C14.4°C	14.4°C	30	4.9	11.311 h
May	19.3°C12.3°C	12.3°C	87	8.4	10.410 h
June	16.8°C10.9°C	10.9°C	117	11.6	10.010 h
July	15.7°C9.9°C	9.9°C	127	13.7	10.210 h
August	16.0°C9.6°C	9.6°C	106	12.3	10.911 h
September, selected	16.8°C10.0°C	10.0°C	74	9.9	11.912 h
October	19.5°C11.2°C	11.2°C	34	5.5	12.913 h
November	22.9°C13.4°C	13.4°C	29	4.8	13.814 h
December	26.2°C15.2°C	15.2°C	11	1.9	14.314 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

September in nearby cities

Distance from Bunbury

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bunbury) is explained once on the Bunbury year overview and on the Sources, method and limits page.