September weather forecast
Oakland, OR

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Oakland, Oregon, with an average temperature fluctuating between 45.3°F (7.4°C) and 73.9°F (23.3°C).

Temperature

Transition into September subtly marks a drop in the average high-temperature, moderately moving from 80.2°F (26.8°C) in August to a still warm 73.9°F (23.3°C). In Oakland, the nighttime chill during September is a clear shift from the day's highs, with an average of 45.3°F (7.4°C).

Humidity

In Oakland, the average relative humidity in September is 74%.

Rainfall

In Oakland, during September, the rain falls for 7.7 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Oakland, during the entire year, the rain falls for 153.9 days and collects up to 27.72" (704mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Oakland, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:55 pm PDT.

Sunshine

In September, the average sunshine is 9.6h.

UV index

In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 3 in September translates into these instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Enhance your sun protection with tightly woven, yet airy clothing.

Frequently asked questions

What is the usual temperature for Oakland in September?

September temperatures vary between a high-temperature of 73.9°F (23.3°C) and a low-temperature of 45.3°F (7.4°C).

What is the average humidity in September?

In Oakland, the average relative humidity in September is 74%.

How many days does it rain in September?

In Oakland, in September, during 7.7 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

When it does not snow?

In Oakland, snow does not fall in May through October.

How many hours of daylight does Oakland have in September?

In Oakland, the average day length in September is 12h and 29min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:55 pm PDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.6h.

How high is the UV index in September?

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Oakland, OR

Average temperature in September - Oakland, OR
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (46°F).

  • Average low temperature in September: 45.3°F

The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).

Average pressure in September
Oakland, OR

Average pressure in September - Oakland, OR
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in September
Oakland, OR

Average wind speed in September - Oakland, OR
  • Average wind speed in September: 3.2mph

The windiest months (with the highest average wind speed) are January and March (4mph).
The calmest month (with the lowest average wind speed) is September (3.2mph).

Average humidity in September
Oakland, OR

Average humidity in September - Oakland, OR
  • Average humidity in September: 74%

The months with the highest relative humidity are January, February and December (87%).
The months with the lowest relative humidity are July and August (71%).

Average rainfall in September
Oakland, OR

Average rainfall in September - Oakland, OR
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is December (4.17").
The driest month (with the least rainfall) is July (0.2").

Average rainfall days in September
Oakland, OR

Average rainfall days in September - Oakland, OR
  • Average rainfall days in September: 7.7 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in September
Oakland, OR

Average snowfall in September - Oakland, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.89").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Oakland, OR

Average snowfall days in September - Oakland, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Oakland, OR

Average daylight in September / Average sunshine in September - Oakland, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days in September
Oakland, OR

Average sunshine days in September - Oakland, OR
  • Average sunshine days in September: 20.5 days

The month with the most sunshine days is July (25.4 days).
The month with the least sunshine days is February (9.7 days).

Average UV index in September
Oakland, OR

Average UV index in September - Oakland, OR
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Oakland, OR

Average cloud cover in September - Oakland, OR
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Oakland, OR

Average visibility in September - Oakland, OR
  • Average visibility in September: 5mi

The months with the highest visibility are July, August and September (5mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (4mi).

Oakland, Oregon, USA

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