September weather forecast
Palatine, IL

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Weather in September

September carries a whisper of change in the air of Palatine as the city transitions towards fall with high temperatures sliding down to 73.2°F (22.9°C). The weather gives off an ambiguously warm and yet subtly cool feel. It is a time of considerable change as the foliage starts to turn shades of orange and red, reflecting the changing climate. Despite days getting shorter, the city enjoys 8.8 hours of sunshine, providing enough daylight to explore the outdoors. September, thus heralds the arrival of fall with changes that ripple through the climate and nature.

Temperature

In Palatine, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's warm 80.1°F (26.7°C) to a pleasant 73.2°F (22.9°C). Nighttime temperatures consistently average a mild 57.9°F (14.4°C) during September.

Humidity

In Palatine, the average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 10.5 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Palatine, during the entire year, the rain falls for 120.6 days and collects up to 13.98" (355mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm CDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 4 in September transforms into this advice:
Undertake protective steps - Preventing sun damage is advised. When the Sun is at its strongest around midday, find shade and limit exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jun 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures in Palatine?

In September, the average high-temperature and low-temperature are 73.2°F (22.9°C) and 57.9°F (14.4°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is appraised at 87.8°F (31°C).

What is the average humidity in September in Palatine?

In Palatine, the average relative humidity in September is 75%.

How much does it rain in September?

In Palatine, Illinois, during September, the rain falls for 10.5 days and regularly aggregates up to 1.14" (29mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Palatine have in September?

In Palatine, the average day length in September is 12h and 28min.

What time are sunrise and sunset in September in Palatine?

On the first day of September, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.8h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
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
Palatine, IL

Average temperature in September - Palatine, IL
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 57.9°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure in September
Palatine, IL

Average pressure in September - Palatine, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Palatine, IL

Average wind speed in September - Palatine, IL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in September
Palatine, IL

Average humidity in September - Palatine, IL
  • Average humidity in September: 75%

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

Average rainfall in September
Palatine, IL

Average rainfall in September - Palatine, IL
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is December (0.59").

Average rainfall days in September
Palatine, IL

Average rainfall days in September - Palatine, IL
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in September
Palatine, IL

Average snowfall in September - Palatine, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Palatine, IL

Average snowfall days in September - Palatine, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Palatine, IL

Average daylight in September / Average sunshine in September - Palatine, IL
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in September
Palatine, IL

Average sunshine days in September - Palatine, IL
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is July (12.1 days).

Average UV index in September
Palatine, IL

Average UV index in September - Palatine, IL
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in September
Palatine, IL

Average cloud cover in September - Palatine, IL
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 31).

Average visibility in September
Palatine, IL

Average visibility in September - Palatine, IL
  • 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).

Palatine, Illinois, USA

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