September weather forecastYreka, CA
September
Weather in September
September, the first month of the autumn in Yreka, is also a moderately hot month, with an average temperature fluctuating between 44.8°F (7.1°C) and 75.9°F (24.4°C).Temperature
During the shift to September, Yreka records a mild decrease in average high-temperature, moving from 84.2°F (29°C) in August to a still warm 75.9°F (24.4°C). Marked by a significant drop from the daytime highs, Yreka's average low-temperature in September stands at a frosty 44.8°F (7.1°C).Humidity
In September, the average relative humidity is 55%.Rainfall
In Yreka, in September, during 4.1 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Yreka, during the entire year, the rain falls for 116 days and collects up to 17.8" (452mm) of precipitation.Snowfall
In Yreka, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:37 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:53 pm PDT.
Sunshine
In September, the average sunshine is 11h.UV index
In Yreka, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 4 during September leads to these instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Yreka, CA
- Average high temperature in September: 75.9°F
The warmest months (with the highest average high temperature) are July and August (84.2°F).
The month with the lowest average high temperature is December (41.5°F).
- Average low temperature in September: 44.8°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is December (26.6°F).
Average pressure in September
Yreka, CA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in September
Yreka, CA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is March (5.4mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in September
Yreka, CA
- Average humidity in September: 55%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (52%).
Average rainfall in September
Yreka, CA
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Yreka, CA
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is March (16.7 days).
The month with the least rainy days is July (3.2 days).
Average snowfall in September
Yreka, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.39").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Yreka, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Yreka, CA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 42min).
Average sunshine days in September
Yreka, CA
- Average sunshine days in September: 25.1 days
The month with the most sunshine days is August (25.7 days).
The month with the least sunshine days is March (11 days).
Average UV index in September
Yreka, CA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Yreka, CA
- Average cloud cover in September: 14
The months with the most cloud cover are March and December (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in September
Yreka, CA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
