September Weather in Grab, Croatia

Last updated: August 23, 2025

In Grab, Croatia, the average temperature in September hovers around 17°C (63°F). Expect a range that can dip to a chilly 3°C (37°F) at night and soar to a warm 29°C (85°F) during the day. With an average humidity of 69%, the climate can feel quite muggy. Additionally, brace for some rain, as 105 mm (4.1 in) of precipitation is likely over 11 days throughout the month.

September Temperature in Grab

In September in Grab, the average temperature is 17°C (63°F). Maximums can reach 29°C (85°F) while minimums can drop as low as 3°C (37°F). This mild climate makes Grab an ideal destination for travelers looking to enjoy pleasant weather.

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

The chart illustrates September temperature patterns in Grab, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grab, September typically has an average temperature of 17°C (63°F), with highs reaching up to 29°C (85°F) and lows dropping to around 3°C (37°F).

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

September Precipitation in Grab

In Grab in September, the precipitation amount is 105 mm (4.1 in) over the course of 11 days.

September Precipitation Trends in Grab

The chart displays monthly precipitation patterns in Grab, 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 Grab, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 11 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 Grab

In Grab 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 Grab

This chart illustrates the average monthly humidity levels in Grab, 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 Grab 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 Grab

In Grab in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Grab.

Maximum UV Index Levels in Grab for September

The chart shows the monthly maximum UV Index (UVI) for Grab 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 Grab typically reaches 7, which falls under the high exposure category.

Data source: Grab 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 Grab Compares to Other Months

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

This table compares monthly weather conditions in Grab, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	111 mm (4.4 inches)	83%	low
February Weather	4°C (40°F)	139 mm (5.5 inches)	76%	moderate
March Weather	6°C (43°F)	121 mm (4.8 inches)	73%	high
April Weather	10°C (50°F)	113 mm (4.4 inches)	75%	high
May Weather	14°C (58°F)	125 mm (4.9 inches)	78%	very high
June Weather	19°C (67°F)	68 mm (2.7 inches)	75%	very high
July Weather	22°C (71°F)	55 mm (2.2 inches)	71%	very high
August Weather	22°C (72°F)	52 mm (2.0 inches)	65%	very high
September Weather	17°C (63°F)	105 mm (4.1 inches)	69%	high
October Weather	12°C (54°F)	128 mm (5.1 inches)	76%	moderate
November Weather	8°C (47°F)	245 mm (9.6 inches)	81%	moderate
December Weather	4°C (39°F)	248 mm (9.8 inches)	81%	low