Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
October is characterized by a clear drop in the average high-temperature, falling from September's warm 75°F (23.9°C) to a mild 59.7°F (15.4°C). During October, Portsmouth records a consistent average nighttime temperature of 44.1°F (6.7°C).Humidity
October is the least humid month, with an average relative humidity of 68%.Rainfall
In Portsmouth, during October, the rain falls for 8.5 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Portsmouth, during the entire year, the rain falls for 113.5 days and collects up to 15.71" (399mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. October is the first month it typically snows in Portsmouth. Throughout October, in the average 0.7 snowfall days, it receives 0.24" (6mm) of snow. In Portsmouth, during the entire year, snow falls for 31.5 days and aggregates up to 7.13" (181mm) of snow.Daylight
In Portsmouth, Iowa, the average length of the day in October is 11h and 4min.On the first day of October, sunrise is at 7:19 am and sunset at 7:03 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 6:17 pm CDT.
Sunshine
In October, the average sunshine is 5.9h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 2 during October translates into the following directions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are October temperatures?
What is the least humid month?
What is the average humidity in October?
How much does it rain in Portsmouth in October?
When does it start snowing in Portsmouth?
How many hours of daylight does Portsmouth have in October?
When is the sunrise / sunset in October in Portsmouth?
How long on average sun shines in October?
What are the months with the lowest UV index?
How high is the UV index in October?
Average temperature in October
Portsmouth, IA
- Average high temperature in October: 59.7°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in October: 44.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in October
Portsmouth, IA
- Average pressure in October: 30"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in October
Portsmouth, IA
- Average wind speed in October: 9.7mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in October
Portsmouth, IA
- Average humidity in October: 68%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).
Average rainfall in October
Portsmouth, IA
- Average rainfall in October: 1.06"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in October
Portsmouth, IA
- Average rainfall days in October: 8.5 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in October
Portsmouth, IA
- Average snowfall in October: 0.24"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in October
Portsmouth, IA
- Average snowfall days in October: 0.7 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in October /
Average sunshine in October
Portsmouth, IA
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in October: 5h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in October
Portsmouth, IA
- Average sunshine days in October: 20.5 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).
Average UV index in October
Portsmouth, IA
- Average UV index in October: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in October
Portsmouth, IA
- Average cloud cover in October: 35
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in October
Portsmouth, IA
- Average visibility in October: 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).
Portsmouth, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location