October weather forecast
Sinai, SD

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Weather in October

October, like September, is a moderate autumn month in Sinai, South Dakota, with an average temperature ranging between max 55.6°F (13.1°C) and min 39.6°F (4.2°C).

Temperature

As Sinai transitions into October, a marked decrease in the average high-temperature is observed, dropping from an agreeable 72.5°F (22.5°C) in September to a mild 55.6°F (13.1°C). Throughout October nights, Sinai registers an average low-temperature of 39.6°F (4.2°C).

Humidity

October is the least humid month in Sinai, with an average relative humidity of 68%.

Rainfall

In October, the rain falls for 9 days. Throughout October, 1.73" (44mm) of precipitation is accumulated. In Sinai, during the entire year, the rain falls for 125.5 days and collects up to 21.65" (550mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Sinai. October is the first month it typically snows. Throughout October, in the average 1.6 snowfall days, it receives 0.31" (8mm) of snow. In Sinai, during the entire year, snow falls for 61.5 days and aggregates up to 21.38" (543mm) of snow.

Daylight

In Sinai, the average length of the day in October is 10h and 58min.
On the first day of the month, sunrise is at 7:26 am and sunset at 7:08 pm. On the last day of October, sunrise is at 8:04 am and sunset at 6:18 pm CDT.

Sunshine

The average sunshine in October in Sinai is 6h.

UV index

In October, the average daily maximum UV index in Sinai is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 2 during October translates into the following directions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are October temperatures in Sinai?

The high-temperature during October is 55.6°F (13.1°C) and the low-temperature is 39.6°F (4.2°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is estimated at 86°F (30°C).

What is the least humid month in Sinai?

With an average relative humidity of 68%, October is the least humid month.

What is the average humidity in October in Sinai?

In October, the average relative humidity in Sinai is 68%.

How much does it rain in Sinai in October?

In October, in Sinai, South Dakota, the rain falls for 9 days. Throughout October, 1.73" (44mm) of precipitation is accumulated.

When does it start to snow in Sinai?

October is the first month it typically snows in Sinai, South Dakota. Throughout October, in the average 1.6 snowfall days, it receives 0.31" (8mm) of snow.

How many hours of daylight does Sinai have in October?

In Sinai, the average day length in October is 10h and 58min.

When are sunrise and sunset in October in Sinai?

In October, on the first day of the month, sunrise is at 7:26 am and sunset at 7:08 pm. On the last day of the month, in Sinai, sunrise is at 8:04 am and sunset at 6:18 pm CDT.

How many hours of sunshine does Sinai have in October?

In Sinai, South Dakota, the average sunshine duration in October is 6h.

How high is the UV index in October in Sinai?

In Sinai, South Dakota, the average daily maximum UV index in October is 2. A UV Index value of 2, and less, symbolizes 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
Sinai, SD

Average temperature in October - Sinai, SD
  • Average high temperature in October: 55.6°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (20.7°F).

  • Average low temperature in October: 39.6°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 (7°F).

Average pressure in October
Sinai, SD

Average pressure in October - Sinai, SD
  • Average pressure in October: 29.98"Hg

The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in October
Sinai, SD

Average wind speed in October - Sinai, SD
  • Average wind speed in October: 10.9mph

The windiest month (with the highest average wind speed) is April (11.5mph).
The calmest month (with the lowest average wind speed) is July (8.4mph).

Average humidity in October
Sinai, SD

Average humidity in October - Sinai, SD
  • Average humidity in October: 68%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is October (68%).

Average rainfall in October
Sinai, SD

Average rainfall in October - Sinai, SD
  • Average rainfall in October: 1.73"

The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is November (0.67").

Average rainfall days in October
Sinai, SD

Average rainfall days in October - Sinai, SD
  • Average rainfall days in October: 9 days

The month with the highest number of rainy days is June (19.8 days).
The month with the least rainy days is January (3.2 days).

Average snowfall in October
Sinai, SD

Average snowfall in October - Sinai, SD
  • Average snowfall in October: 0.31"

The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in October
Sinai, SD

Average snowfall days in October - Sinai, SD
  • Average snowfall days in October: 1.6 days

The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in October /
Average sunshine in October
Sinai, SD

Average daylight in October / Average sunshine in October - Sinai, SD
  • Average daylight in October: 11h and 0min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in October: 6h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in October
Sinai, SD

Average sunshine days in October - Sinai, SD
  • Average sunshine days in October: 18.5 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (8.3 days).

Average UV index in October
Sinai, SD

Average UV index in October - Sinai, SD
  • Average UV index in October: 2

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

Average cloud cover in October
Sinai, SD

Average cloud cover in October - Sinai, SD
  • Average cloud cover in October: 36

The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 28).

Average visibility in October
Sinai, SD

Average visibility in October - Sinai, SD
  • 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).

Sinai, South Dakota, USA

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