September weather forecastForestville, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Forestville, California, with temperature in the range of an average high of 82.2°F (27.9°C) and an average low of 53.6°F (12°C).Temperature
Forestville experiences a recorded average high-temperature of a still warm 82.2°F (27.9°C) in September, closely aligned with August's 83.5°F (28.6°C). Contrary to the day's heat, an average low-temperature of 53.6°F (12°C) is recorded during the nights in September.Heat index
The heat index value for September is computed to be 84.2°F (29°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.Heat index specifics point out values are for conditions of shade and a slight breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
With an average relative humidity of 58%, September is the least humid month.Rainfall
In Forestville, during September, the rain falls for 2.5 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 80.5 rainfall days, and 17.6" (447mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:41 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:55 pm PDT.
Sunshine
In September, the average sunshine is 11h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. 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
Forestville, CA
- Average high temperature in September: 82.2°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (40.5°F).
Average pressure in September
Forestville, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Forestville, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is May (6.4mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity in September
Forestville, CA
- Average humidity in September: 58%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (58%).
Average rainfall in September
Forestville, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (3.78").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Forestville, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1 days).
Average daylight in September /
Average sunshine in September
Forestville, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Forestville, CA
- Average sunshine days in September: 27 days
The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (15.3 days).
Average UV index in September
Forestville, 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 January, February, November and December (UV index 3).
Average cloud cover in September
Forestville, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Forestville, 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).
