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 sea temperature 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
In Portsmouth, the beginning of October is marked by a lowered average high-temperature, shifting from September's agreeable 69.1°F (20.6°C) to a mild 57.9°F (14.4°C). Throughout October, Portsmouth encounters an average temperature drop to a chilly 47.1°F (8.4°C).Humidity
In October, the average relative humidity is 78%.Rainfall
The month with the most rainfall is October, when the rain falls for 13.3 days and typically aggregates up to 2.83" (72mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Portsmouth, New Hampshire. October is the first month it typically snows. Throughout October, in the average 0.3 snowfall days, it receives 0.31" (8mm) of snow. Throughout the year, there are 35.2 snowfall days, and 16.97" (431mm) of snow is accumulated.Ocean temperature
In Portsmouth, in October, the average water temperature is 55.9°F (13.3°C).Note: Swimming in 55.9°F (13.3°C) feels unbearing at 55.4°F (13°C) and can be life-risking below 50°F (10°C), causing breathing issues and cold shock, depending on a person's capacity.
Daylight
The average length of the day in October is 11h and 1min.On the first day of the month, sunrise is at 6:41 am and sunset at 6:23 pm. On the last day of October, sunrise is at 7:17 am and sunset at 5:35 pm EDT.
Sunshine
In Portsmouth, the average sunshine in October is 6.1h.UV index
In Portsmouth, the average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In October, the maximum UV index of 3 transforms into these recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in October?
What is the average humidity in October?
What is the rainiest month?
How many days does it rain in October in Portsmouth?
When does it start snowing?
How cold is the water in October?
What is the average length of the day in October?
What time are sunrise and sunset in October?
How many hours of sunshine does Portsmouth have in October?
How high is the UV index in October?
Average temperature in October
Portsmouth, NH
- Average high temperature in October: 57.9°F
The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in October: 47.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in October
Portsmouth, NH
- Average pressure in October: 30"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in October
Portsmouth, NH
- Average wind speed in October: 9.3mph
The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in October
Portsmouth, NH
- Average humidity in October: 78%
The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).
Average rainfall in October
Portsmouth, NH
- Average rainfall in October: 2.83"
The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in October
Portsmouth, NH
- Average rainfall days in October: 13.3 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in October
Portsmouth, NH
- Average snowfall in October: 0.31"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in October
Portsmouth, NH
- Average snowfall days in October: 0.3 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in October
Portsmouth, NH
- Average sea temperature in October: 55.9°F
The best month for swimming (with the highest average sea temperature) is August (65.6°F).
The coldest month (with the lowest average sea temperature) is March (38.5°F).
Average daylight in October /
Average sunshine in October
Portsmouth, NH
- Average daylight in October: 11h and 0min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in October: 6h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in October
Portsmouth, NH
- Average sunshine days in October: 15.1 days
The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in October
Portsmouth, NH
- Average UV index in October: 3
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in October
Portsmouth, NH
- Average cloud cover in October: 42
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in October
Portsmouth, NH
- 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, New Hampshire, USA
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