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 advent of September observes an average high-temperature of a still warm 81.7°F (27.6°C), nearly identical to August's 82.9°F (28.3°C). An average low-temperature of 64.6°F (18.1°C) marks the nights throughout September.Heat index
September's mean heat index is estimated at 84.2°F (29°C). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.Note that heat index values are valued for light wind and location in the shade. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Humidity
In September, the average relative humidity in Lemon Grove is 61%.Rainfall
In Lemon Grove, during September, the rain falls for 2.2 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, there are 33 rainfall days, and 2.52" (64mm) of precipitation is accumulated.Daylight
In Lemon Grove, the average length of the day in September is 12h and 22min.On the first day of September in Lemon Grove, sunrise is at 6:23 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:33 pm PDT.
Sunshine
The average sunshine in September is 10.3h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Lemon Grove in September?
What is the average humidity in September?
How much does it rain in September?
How many hours of daylight does Lemon Grove have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Lemon Grove have in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Lemon Grove, CA
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (64.4°F).
- Average low temperature in September: 64.6°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).
Average pressure in September
Lemon Grove, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Lemon Grove, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).
Average humidity in September
Lemon Grove, CA
- Average humidity in September: 61%
The month with the highest relative humidity is May (67%).
The month with the lowest relative humidity is November (54%).
Average rainfall in September
Lemon Grove, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and October (0.04").
Average rainfall days in September
Lemon Grove, CA
- Average rainfall days in September: 2.2 days
The month with the highest number of rainy days is March (5.3 days).
The month with the least rainy days is June (0.8 days).
Average daylight in September /
Average sunshine in September
Lemon Grove, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Lemon Grove, CA
- Average sunshine days in September: 27.2 days
The month with the most sunshine days is October (28.9 days).
The month with the least sunshine days is February (23.4 days).
Average UV index in September
Lemon Grove, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Lemon Grove, CA
- Average cloud cover in September: 10
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Lemon Grove, 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).
Lemon Grove, California, USA
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