September Weather in Grantham, Australia

Last updated: August 22, 2025

In September, the average temperature in Grantham, Australia hovers around 17°C (63°F). Expect a minimum of 4°C (39°F) and a maximum of 34°C (94°F). With an average humidity of 69%, you can anticipate comfortable yet slightly humid conditions. Additionally, prepare for some light rain, with a total precipitation amount of 11 mm (0.4 in) over the course of 3 days.

September Temperature in Grantham

In September in Grantham, the average temperature is 17°C (63°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 4°C (39°F). This variation in temperature makes Grantham a suitable destination for travelers seeking a mix of warm days and cooler evenings.

September Weather in Grantham: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grantham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grantham, September typically has an average temperature of 17°C (63°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (39°F).

Data source: Temperature data for Grantham generated using information from the Copernicus Climate Change Service.

September Precipitation in Grantham

In Grantham in September, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

September Precipitation Trends in Grantham

The chart displays monthly precipitation patterns in Grantham, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Grantham, September typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Grantham

In Grantham in September, humidity is 69%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities feel slightly heavier, yet still comfortable for exploring.

September Average Humidity in Grantham

This chart illustrates the average monthly humidity levels in Grantham, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Grantham is approximately 69%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grantham

In Grantham in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grantham.

Maximum UV Index Levels in Grantham for September

The chart shows the monthly maximum UV Index (UVI) for Grantham in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Grantham typically reaches 10, which falls under the very high exposure category.

Data source: Grantham September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Grantham Compares to Other Months

Weather in Grantham varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grantham, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Grantham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (76°F)	69 mm (2.7 inches)	70%	extreme
February Weather	24°C (75°F)	97 mm (3.8 inches)	69%	extreme
March Weather	22°C (73°F)	130 mm (5.1 inches)	75%	extreme
April Weather	19°C (67°F)	38 mm (1.5 inches)	78%	very high
May Weather	16°C (61°F)	19 mm (0.8 inches)	74%	high
June Weather	13°C (56°F)	30 mm (1.2 inches)	76%	moderate
July Weather	13°C (55°F)	27 mm (1.1 inches)	72%	moderate
August Weather	14°C (57°F)	11 mm (0.4 inches)	75%	very high
September Weather	17°C (63°F)	11 mm (0.4 inches)	69%	very high
October Weather	20°C (68°F)	122 mm (4.8 inches)	62%	extreme
November Weather	22°C (71°F)	61 mm (2.4 inches)	61%	extreme
December Weather	24°C (75°F)	96 mm (3.8 inches)	70%	extreme