Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from 84.7°F (29.3°C) to a still warm 78.6°F (25.9°C). Riverkern, amid September nights, sees a noteworthy disparity from daily highs with an average temperature of 52.7°F (11.5°C).Humidity
The average relative humidity in September is 34%.Rainfall
In Riverkern, California, during September, the rain falls for 2.5 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Riverkern, during the entire year, the rain falls for 61 days and collects up to 11.81" (300mm) of precipitation.Snowfall
In Riverkern, snow does not fall in May through October.Daylight
The average length of the day in September in Riverkern, California, is 12h and 23min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:38 pm PDT.
Sunshine
The average sunshine in September is 11h.UV index
In Riverkern, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Riverkern?
What is the average humidity in September in Riverkern?
How many days does it rain in September in Riverkern?
When it does not snow in Riverkern?
What is the average length of the day in September in Riverkern?
When are sunrise and sunset in September in Riverkern?
How long on average sun shines in September in Riverkern?
How high is the UV index in September in Riverkern?
Average temperature in September
Riverkern, CA
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (48.7°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is December (30.9°F).
Average pressure in September
Riverkern, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Riverkern, CA
- Average wind speed in September: 5.4mph
The windiest months (with the highest average wind speed) are May and June (7.3mph).
The calmest months (with the lowest average wind speed) are January and September (5.4mph).
Average humidity in September
Riverkern, CA
- Average humidity in September: 34%
The month with the highest relative humidity is February (59%).
The month with the lowest relative humidity is August (31%).
Average rainfall in September
Riverkern, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is January (2.48").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Riverkern, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in September
Riverkern, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Riverkern, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Riverkern, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 11h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Riverkern, CA
- Average sunshine days in September: 26.6 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (19 days).
Average UV index in September
Riverkern, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Riverkern, CA
- Average cloud cover in September: 5
The month with the most cloud cover is March (Cloud cover 26).
The months with the least cloud cover are August and September (Cloud cover 5).
Average visibility in September
Riverkern, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Riverkern, California, USA
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