September weather forecast and climate
Twain, CA

Weather in September

September, the first month of the autumn, in Twain, is still a warm month, with average temperature ranging between max 75°F (23.9°C) and min 43.9°F (6.6°C).

Temperature

In Twain, California, the average high-temperature in September slightly decreases, from 82.9°F (28.3°C) in August, to a still moderately hot 75°F (23.9°C). The average low-temperature, in September, is 43.9°F (6.6°C).

Humidity

The average relative humidity in September is 47%.

Rainfall

In Twain, in September, during 4.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Twain, California, during the entire year, the rain falls for 91.7 days and collects up to 23.19" (589mm) of precipitation.

Snowfall

In Twain snow does not fall in June through September.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 11.2h.

UV index

In Twain, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
[Resources]

FAQ

What is the temperature in September in Twain?

The average high-temperature, in September, in Twain, California, is 75°F (23.9°C), while the average low-temperature is 43.9°F (6.6°C).

What is the average humidity in September in Twain?

In September, the average relative humidity in Twain is 47%.

How many days does it rain in September in Twain?

In September, the rain falls for 4.1 days. Throughout September, 0.39" (10mm) of precipitation is accumulated.

Does it snow in Twain in September?

In Twain, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Twain?

In Twain, California, snow does not fall in June through September.

What is the average length of the day in September in Twain?

In September, the average length of the day in Twain is 12.4h.

How long on average sun shines in September in Twain?

The average sunshine in September is 11.2h.

What is the UV index reading in September in Twain?

In Twain, California, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Twain, CA

Average temperature in September - Twain, CA
  • Average high temperature in September: 75°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (39.2°F).

  • Average low temperature in September: 43.9°F

The month with the highest average low temperature is July (49.1°F).
The coldest month (with the lowest average low temperature) is December (23.4°F).

[Resources]

Average pressure in September
Twain, CA

Average pressure in September - Twain, CA
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.19").
The month with the lowest atmospheric pressure is June (29.9").

[Resources]

Average wind speed in September
Twain, CA

Average wind speed in September - Twain, CA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is March (6.4mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

[Resources]

Average humidity in September
Twain, CA

Average humidity in September - Twain, CA
  • Average humidity in September: 47%

Months with the highest relative humidity are January and March (81%).
The month with the lowest relative humidity is July (41%).

[Resources]

Average rainfall in September
Twain, CA

Average rainfall in September - Twain, CA
  • Average rainfall in September: 0.39"

The wettest months (with the highest rainfall) are February and December (4.06").
The driest month (with the least rainfall) is July (0.12").

[Resources]

Average rainfall days in September
Twain, CA

Average rainfall days in September - Twain, CA
  • Average rainfall days in September: 4.1 days

The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is August (1.8 days).

[Resources]

Average snowfall in September
Twain, CA

Average snowfall in September - Twain, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (13.07").
Months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Twain, CA

Average snowfall days in September - Twain, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is March (8.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Twain, CA

Average daylight in September / Average sunshine in September - Twain, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 5.4h).

[Resources]

Average sunshine days in September
Twain, CA

Average sunshine days in September - Twain, CA
  • Average sunshine days in September: 25.6 days

The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (12.3 days).

[Resources]

Average UV index in September
Twain, CA

Average UV index in September - Twain, CA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

[Resources]

Average cloud cover in September
Twain, CA

Average cloud cover in September - Twain, CA
  • Average cloud cover in September: 11

The month with the most cloud cover is March (Cloud cover 45).
Months with the least cloud cover are July and August (Cloud cover 6).

[Resources]

Average visibility in September
Twain, CA

Average visibility in September - Twain, CA
  • Average visibility in September: 6mi

Months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February, March and December (5mi).

[Resources]