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 still moderately hot 79.7°F (26.5°C), subtly diverging from August's 80.8°F (27.1°C). September nights experience a consistent temperature drop to an enjoyable 63.3°F (17.4°C).Humidity
The average relative humidity in September in Mission Viejo is 63%.Rainfall
In Mission Viejo, in September, during 4.4 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Mission Viejo, California, during the entire year, the rain falls for 64.1 days and collects up to 5.67" (144mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:15 pm. On the last day of September, in Mission Viejo, sunrise is at 6:44 am and sunset at 6:35 pm PDT.
Sunshine
The average sunshine in September in Mission Viejo, California, is 10.5h.UV index
The months with the highest UV index in Mission Viejo are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a regular UV index of 6 translates into these guidelines:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. 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. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What is the usual temperature for Mission Viejo in September?
What is the average humidity in September in Mission Viejo?
How much does it rain in Mission Viejo in September?
What is the average length of the day in September in Mission Viejo?
When is the sunrise / sunset in September in Mission Viejo?
How long on average sun shines in September in Mission Viejo?
When is the highest UV index in Mission Viejo?
What is the UV index intensity in September in Mission Viejo?
Average temperature in September
Mission Viejo, CA
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in September: 63.3°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).
Average pressure in September
Mission Viejo, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in September
Mission Viejo, CA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in September
Mission Viejo, CA
- Average humidity in September: 63%
The months with the highest relative humidity are May and June (70%).
The month with the lowest relative humidity is November (56%).
Average rainfall in September
Mission Viejo, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is December (0.98").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Mission Viejo, CA
- Average rainfall days in September: 4.4 days
The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is June (2.3 days).
Average daylight in September /
Average sunshine in September
Mission Viejo, 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 3min
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
Mission Viejo, CA
- Average sunshine days in September: 22.1 days
The months with the most sunshine days are January and August (24.4 days).
The month with the least sunshine days is May (19.5 days).
Average UV index in September
Mission Viejo, 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, March, November and December (UV index 4).
Average cloud cover in September
Mission Viejo, CA
- Average cloud cover in September: 11
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Mission Viejo, 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).
Mission Viejo, California, USA
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