October weather forecast
Ann Arbor, MI

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The vast University of Michigan Law School Campus in Ann Arbor, Michigan
The vast University of Michigan Law School Campus in Ann Arbor, Michigan

Weather in October

October is a time when Ann Arbor is fully engulfed in fall, with mild days and cooler nights. With leaves changing into vibrant hues of red, orange, and gold, the city is a visual treat. Cultural events and Halloween festivities dominate the social calendar of October, indicating the city's residents' high spirits despite the dipping temperatures. The daylight hours shorten significantly, paving the way for longer, cooler nights. The most significant change in the weather during October is a sharp drop in high temperature from 72.5°F (22.5°C) in September to 59.2°F (15.1°C).

Temperature

A moderate decline in the average high-temperature is seen during October, decreasing from a pleasant 72.5°F (22.5°C) in September to a refreshing 59.2°F (15.1°C). During October, the nighttime temperature averages of 44.4°F (6.9°C).

Humidity

In Ann Arbor, the average relative humidity in October is 77%.

Rainfall

In October, the rain falls for 12.2 days. Throughout October, 1.3" (33mm) of precipitation is accumulated. In Ann Arbor, Michigan, during the entire year, the rain falls for 144.9 days and collects up to 18.82" (478mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. October is the first month it typically snows. Throughout October, in the average 0.5 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 45 snowfall days, and 9.69" (246mm) of snow is accumulated.

Daylight

In October, the average length of the day is 11h and 3min.
On the first day of the month, sunrise is at 7:32 am and sunset at 7:15 pm. On the last day of October, sunrise is at 8:07 am and sunset at 6:29 pm EDT.

Sunshine

In October, the average sunshine is 5.6h.

UV index

The average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: A typical high UV index of 2 in October suggests the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Updated: Jul 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are October temperatures?

The high-temperature, in October, in Ann Arbor, records 59.2°F (15.1°C), while the low-temperature is 44.4°F (6.9°C).

What is the average humidity in October?

The average relative humidity in October is 77%.

How many days does it rain in October?

In Ann Arbor, in October, during 12.2 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

When does it start snowing?

October is the first month it typically snows. Throughout October, in the average 0.5 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Ann Arbor have in October?

The average day length in October is 11h and 3min.

When is the sunrise / sunset in October?

On the first day of October, sunrise is at 7:32 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 6:29 pm EDT.

How many hours of sunshine does Ann Arbor have in October?

In Ann Arbor, the average sunshine duration in October is 5.6h.

What is the UV index intensity in October?

In Ann Arbor, the average daily maximum UV index in October is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Ann Arbor, MI

Average temperature in October - Ann Arbor, MI
  • Average high temperature in October: 59.2°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in October: 44.4°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

Average pressure in October
Ann Arbor, MI

Average pressure in October - Ann Arbor, MI
  • Average pressure in October: 30"Hg

The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in October
Ann Arbor, MI

Average wind speed in October - Ann Arbor, MI
  • Average wind speed in October: 8.9mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

Average humidity in October
Ann Arbor, MI

Average humidity in October - Ann Arbor, MI
  • Average humidity in October: 77%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).

Average rainfall in October
Ann Arbor, MI

Average rainfall in October - Ann Arbor, MI
  • Average rainfall in October: 1.3"

The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.87").

Average rainfall days in October
Ann Arbor, MI

Average rainfall days in October - Ann Arbor, MI
  • Average rainfall days in October: 12.2 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in October
Ann Arbor, MI

Average snowfall in October - Ann Arbor, MI
  • Average snowfall in October: 0.08"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in October
Ann Arbor, MI

Average snowfall days in October - Ann Arbor, MI
  • Average snowfall days in October: 0.5 days

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in October /
Average sunshine in October
Ann Arbor, MI

Average daylight in October / Average sunshine in October - Ann Arbor, MI
  • Average daylight in October: 11h and 1min

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 6min).

  • Average sunshine in October: 5h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in October
Ann Arbor, MI

Average sunshine days in October - Ann Arbor, MI
  • Average sunshine days in October: 17.5 days

The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is July (10.3 days).

Average UV index in October
Ann Arbor, MI

Average UV index in October - Ann Arbor, MI
  • Average UV index in October: 2

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

Average cloud cover in October
Ann Arbor, MI

Average cloud cover in October - Ann Arbor, MI
  • Average cloud cover in October: 44

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in October
Ann Arbor, MI

Average visibility in October - Ann Arbor, MI
  • Average visibility in October: 6mi

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

Ann Arbor, Michigan, USA

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