September weather forecastBonsall, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Bonsall, California, with an average temperature ranging between max 81.7°F (27.6°C) and min 61.9°F (16.6°C).Temperature
A minor adjustment in Bonsall's average high-temperature is noted with the start of September, touching a still moderately hot 81.7°F (27.6°C) from August's 83.3°F (28.5°C). Bonsall's average low-temperature in the month of September is recorded at a refreshing 61.9°F (16.6°C).Heat index
September's heat index is calculated to be 84.2°F (29°C). Persistent activity under exposure might lead to a feeling of weariness, with subsequent heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', combines both the air temperature and the humidity level to give a perceived human temperature. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Humidity
The average relative humidity in September is 61%.Rainfall
In Bonsall, in September, it is raining for 4.4 days, with typically 0.31" (8mm) of accumulated precipitation. In Bonsall, during the entire year, the rain falls for 63.6 days and collects up to 8.98" (228mm) of precipitation.Daylight
In Bonsall, the average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:23 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:34 pm PDT.
Sunshine
In Bonsall, the average sunshine in September is 10.5h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 6 in September translates into these instructions:
Guard against overexposure. Protection from sun-induced harm is essential. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bonsall, CA
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is August (63°F).
The coldest months (with the lowest average low temperature) are February and December (46.9°F).
Average pressure in September
Bonsall, 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
Bonsall, CA
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are April and May (5.5mph).
The calmest month (with the lowest average wind speed) is October (4.3mph).
Average humidity in September
Bonsall, CA
- Average humidity in September: 61%
The month with the highest relative humidity is May (69%).
The month with the lowest relative humidity is November (55%).
Average rainfall in September
Bonsall, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Bonsall, CA
- Average rainfall days in September: 4.4 days
The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is June (1.2 days).
Average daylight in September /
Average sunshine in September
Bonsall, CA
- Average daylight in September: 12h and 24min
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 30min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Bonsall, CA
- Average sunshine days in September: 22.5 days
The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is February (20 days).
Average UV index in September
Bonsall, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Bonsall, 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 6).
Average visibility in September
Bonsall, 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).
