September weather forecastHighland, CA
September
Weather in September
September, the first month of the autumn in Highland, is still a warm month, with an average temperature varying between 85.8°F (29.9°C) and 62.4°F (16.9°C).Temperature
September experiences an average high-temperature of a moderately hot 85.8°F (29.9°C), barely different from August's 90.9°F (32.7°C). Despite substantial daily fluctuations, the average low-temperature is an enjoyable 62.4°F (16.9°C) during September.Humidity
In September, the average relative humidity is 39%.Rainfall
In Highland, California, in September, during 2.6 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In Highland, California, during the entire year, the rain falls for 51.8 days and collects up to 6.69" (170mm) of precipitation.Snowfall
January, March through December are months without snowfall in Highland, California.Daylight
The average length of the day in September in Highland, California, is 12h and 22min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:14 pm. On the last day of September, in Highland, California, sunrise is at 6:43 am and sunset at 6:33 pm PDT.
Sunshine
In September, the average sunshine is 10.7h.UV index
In Highland, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Highland, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is December (57.7°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (41.5°F).
Average pressure in September
Highland, CA
- Average pressure in September: 29.86"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Highland, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is September (4.8mph).
Average humidity in September
Highland, CA
- Average humidity in September: 39%
The month with the highest relative humidity is February (52%).
The month with the lowest relative humidity is August (36%).
Average rainfall in September
Highland, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Highland, CA
- Average rainfall days in September: 2.6 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in September
Highland, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Highland, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Highland, CA
- Average sunshine days in September: 25.7 days
The month with the most sunshine days is June (28.5 days).
The month with the least sunshine days is February (20.9 days).
Average UV index in September
Highland, CA
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in September
Highland, CA
- Average cloud cover in September: 6
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Highland, 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).
