September Weather in North Valley, United States

Last updated: June 24, 2025

In North Valley, United States, the average temperature in September is a comfortable 21°C (69°F). However, temperatures can vary significantly, with a minimum of 3°C (38°F) and a maximum of 34°C (94°F). Expect a moderate precipitation amount of 34 mm (1.3 in) over the course of 4 days, and enjoy an average humidity level of 72% for a refreshing atmosphere!

September Temperature in North Valley

In September in North Valley, the average temperature is 21°C (69°F). Maximum temperatures can reach up to 34°C (94°F), while the minimum can dip as low as 3°C (38°F). Be prepared for a diverse range of weather conditions, making it essential to pack accordingly for your travels.

September Weather in North Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in North Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In North Valley, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in North Valley

In North Valley in September, the precipitation amount is 34 mm (1.3 in) over a span of 4 days.

September Precipitation Trends in North Valley

The chart displays monthly precipitation patterns in North Valley, 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 North Valley, September typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 4 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 North Valley

In North Valley in September humidity is 72%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that can be a bit sticky, making travel slightly uncomfortable but tolerable. It creates a tropical atmosphere, perfect for leisurely strolls in the early morning or late afternoon when the heat is more bearable, though midday excursions may require plenty of water and occasional breaks in the shade.

September Average Humidity in North Valley

This chart illustrates the average monthly humidity levels in North Valley, 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 North Valley is approximately 72%, 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 North Valley

In North Valley in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in North Valley.

Maximum UV Index Levels in North Valley for September

The chart shows the monthly maximum UV Index (UVI) for North Valley 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 North Valley typically reaches 11, which falls under the extreme exposure category.

Data source: North Valley 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 North Valley Compares to Other Months

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

This table compares monthly weather conditions in North Valley, 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)	20 mm (0.8 inches)	78%	moderate
February Weather	3°C (37°F)	22 mm (0.9 inches)	79%	high
March Weather	8°C (47°F)	20 mm (0.8 inches)	66%	very high
April Weather	13°C (56°F)	22 mm (0.9 inches)	60%	extreme
May Weather	18°C (65°F)	19 mm (0.7 inches)	57%	extreme
June Weather	24°C (75°F)	24 mm (0.9 inches)	55%	extreme
July Weather	25°C (77°F)	68 mm (2.7 inches)	56%	extreme
August Weather	24°C (75°F)	26 mm (1.0 inches)	65%	extreme
September Weather	21°C (69°F)	34 mm (1.3 inches)	72%	extreme
October Weather	13°C (55°F)	45 mm (1.8 inches)	78%	very high
November Weather	7°C (45°F)	21 mm (0.8 inches)	81%	high
December Weather	2°C (35°F)	14 mm (0.6 inches)	79%	moderate