Weather in Sidney in September 2025
Average weather
Average temperature in Sidney in September
The temperature in September is +79°F on average, with a range between a maximum of +97°F during the day and a minimum of +43°F at night.
The average maximum temperature goes down 17% by the end of the month, compared with the beginning of the month, from +88°F to +79°F.
Is Sidney warm or cold in September?
Sidney is typically warm in September.
Maximum temperatures go down compared to the previous month from +86°F to +75°F. The minimum temperature also goes down from +59°F to +48°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Sidney:
Climate in Sidney in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +86°F | +75°F | +59°F | ||||
| Min. temperature | ||||||
| +37°F | +23°F | -2°F | ||||
| Max. temperature | ||||||
| +104°F | +102°F | +93°F | ||||
| Rainfall | ||||||
| 47 mm | 42 mm | 31 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 55% | 57% | 63% | ||||
| Air pressure | ||||||
| 1012 HPa | 1013 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 12 | 12 | 9 | ||||
| Cloudy days | ||||||
| 5 | 7 | 12 | ||||
| Rainy days | ||||||
| 12 | 10 | 7 | ||||
| Snowy days | ||||||
| 0 | 0 | 2 | ||||
September weather is still as good as in August. It’s getting colder in September. From +86°F in the day, the average maximum temperature lowers to +75°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 47 mm to 42 mm. Humidity rises from 55% to 57%. The average wind speed doesn’t change much during September, staying around 3 m/s. The amount of sunny days stay about the same, averaging 12 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Sidney is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Sidney?
Climate Change Over the Years
The climate in Sidney in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+51°F) and the highest in 2021 (+61°F). The driest year was 1984 with only 161 mm of rainfall, and the wettest year was 2019 with 602 mm.
FAQ
Is September a good time to visit Sidney?
Can you sunbathe in Sidney in September?
Is Sidney rainy in September?
Is it sunny in Sidney in September?
Other cities in USA
Monthly weather in Sidney
Source of the data
For this page, we’ve looked at the typical weather in Sidney, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
