September Weather in Atwater, United States

Last updated: June 24, 2025

In September, the average temperature in Atwater, United States is a comfortable 17°C (63°F). However, be prepared for a range, as temperatures can dip to a chilly 1°C (34°F) or soar to a warm 32°C (90°F). Expect 114 mm (4.5 in) of precipitation over approximately 9 days, accompanied by an average humidity of 81%. Embrace the variations this season brings!

September Temperature in Atwater

In September in Atwater, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Atwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Atwater, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).

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

September Precipitation in Atwater

In Atwater in September, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

September Precipitation Trends in Atwater

The chart displays monthly precipitation patterns in Atwater, 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 Atwater, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Atwater

In Atwater in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

September Average Humidity in Atwater

This chart illustrates the average monthly humidity levels in Atwater, 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 Atwater is approximately 81%, 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 Atwater

In Atwater 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 Atwater.

Maximum UV Index Levels in Atwater for September

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

Data source: Atwater 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 Atwater Compares to Other Months

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

This table compares monthly weather conditions in Atwater, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (14°F)	19 mm (0.8 inches)	87%	moderate
February Weather	-10°C (15°F)	22 mm (0.9 inches)	90%	moderate
March Weather	-1°C (31°F)	51 mm (2.0 inches)	85%	moderate
April Weather	5°C (41°F)	77 mm (3.0 inches)	84%	high
May Weather	14°C (58°F)	100 mm (3.9 inches)	78%	very high
June Weather	21°C (71°F)	84 mm (3.3 inches)	80%	very high
July Weather	23°C (74°F)	96 mm (3.8 inches)	81%	very high
August Weather	21°C (70°F)	138 mm (5.4 inches)	81%	very high
September Weather	17°C (63°F)	114 mm (4.5 inches)	81%	high
October Weather	8°C (47°F)	100 mm (3.9 inches)	84%	moderate
November Weather	0°C (32°F)	28 mm (1.1 inches)	88%	moderate
December Weather	-6°C (22°F)	41 mm (1.6 inches)	84%	low