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 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
The arrival of September brings an average high-temperature of a moderately hot 84.7°F (29.3°C), closely following the temperature pattern of August. Greenfield anticipates a stark contrast in temperature during September nights, with an average low of 57.4°F (14.1°C).Heat index
For most parts of September, the heat index is estimated at a hot 86°F (30°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
In Greenfield, the average relative humidity in September is 48%.Rainfall
In September, in Greenfield, the rain falls for 1.6 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 62.4 rainfall days, and 9.45" (240mm) of precipitation is accumulated.Daylight
The average length of the day in September in Greenfield is 12h and 23min.On the first day of September, sunrise is at 6:37 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September is 11.5h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
How hot is it in Greenfield in September?
What is the average humidity in September in Greenfield?
How much does it rain in Greenfield in September?
What is the average length of the day in September in Greenfield?
What time are sunrise and sunset in September in Greenfield?
How long on average sun shines in September in Greenfield?
What is the UV index reading in September in Greenfield?
Average temperature in September
Greenfield, CA
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (56.8°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is December (40.8°F).
Average pressure in September
Greenfield, 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
Greenfield, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity in September
Greenfield, CA
- Average humidity in September: 48%
The month with the highest relative humidity is February (70%).
The month with the lowest relative humidity is July (46%).
Average rainfall in September
Greenfield, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is December (1.89").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in September
Greenfield, CA
- Average rainfall days in September: 1.6 days
The month with the highest number of rainy days is March (11.8 days).
The month with the least rainy days is August (0.4 days).
Average daylight in September /
Average sunshine in September
Greenfield, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 11h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in September
Greenfield, CA
- Average sunshine days in September: 27.7 days
The month with the most sunshine days is August (30.1 days).
The month with the least sunshine days is March (18.3 days).
Average UV index in September
Greenfield, 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 3).
Average cloud cover in September
Greenfield, CA
- Average cloud cover in September: 6
The months with the most cloud cover are March and December (Cloud cover 32).
The months with the least cloud cover are July and August (Cloud cover 4).
Average visibility in September
Greenfield, 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).
Greenfield, California, USA
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