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 snowfall in September
- Average snowfall 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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a hot 94.5°F (34.7°C) to a still tropical 86.9°F (30.5°C). Johannesburg's average low-temperature during September nights is observed to be a refreshing 66.2°F (19°C).Humidity
In Johannesburg, California, the average relative humidity in September is 22%.Rainfall
In Johannesburg, in September, it is raining for 1.9 days, with typically 0.12" (3mm) of accumulated precipitation. In Johannesburg, during the entire year, the rain falls for 29.6 days and collects up to 2.64" (67mm) of precipitation.Snowfall
In Johannesburg, snow does not fall in January through October and December.Daylight
In Johannesburg, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:17 pm. On the last day of September, in Johannesburg, California, sunrise is at 6:45 am and sunset at 6:35 pm PDT.
Sunshine
In Johannesburg, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index in Johannesburg is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A daily maximum UV index of 6 in September translates into the following instructions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
Is it hot in Johannesburg during September?
What is the average humidity in September in Johannesburg?
How many days does it rain in September in Johannesburg?
When it does not snow in Johannesburg?
What is the average length of the day in September in Johannesburg?
What time are sunrise and sunset in September in Johannesburg?
How long on average sun shines in September in Johannesburg?
What is the UV index intensity in September in Johannesburg?
Average temperature in September
Johannesburg, CA
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (52.5°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is December (37.6°F).
Average pressure in September
Johannesburg, CA
- Average pressure in September: 29.87"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).
Average wind speed in September
Johannesburg, CA
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is May (9.3mph).
The calmest month (with the lowest average wind speed) is January (5.7mph).
Average humidity in September
Johannesburg, CA
- Average humidity in September: 22%
The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is August (20%).
Average rainfall in September
Johannesburg, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (0.35").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Johannesburg, CA
- Average rainfall days in September: 1.9 days
The month with the highest number of rainy days is July (4.5 days).
The month with the least rainy days is June (1.2 days).
Average snowfall in September
Johannesburg, CA
- Average snowfall in September: 0"
The month with the highest snowfall is November (0.83").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Johannesburg, CA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January, February, November and December (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Johannesburg, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The months with the least sunshine are January and December (Average sunshine: 7h and 6min).
Average sunshine days in September
Johannesburg, CA
- Average sunshine days in September: 25.4 days
The month with the most sunshine days is December (28.1 days).
The month with the least sunshine days is July (23.2 days).
Average UV index in September
Johannesburg, CA
- Average UV index in September: 6
The month with the highest UV index is July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in September
Johannesburg, CA
- Average cloud cover in September: 4
The months with the most cloud cover are January, March and December (Cloud cover 17).
The month with the least cloud cover is September (Cloud cover 4).
Average visibility in September
Johannesburg, 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).
Johannesburg, California, USA
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