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
Onset of October in Portsmouth, New Hampshire, witnesses a reduction in the average high-temperature, falling from an agreeable 69.1°F (20.6°C) in September to a mild 57.9°F (14.4°C). Portsmouth experiences an average nighttime temperature of 47.1°F (8.4°C) in the month of October.Humidity
The average relative humidity in October in Portsmouth, New Hampshire, is 78%.Rainfall
The month with the most rainfall in Portsmouth, New Hampshire, 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. October is the first month it typically snows in Portsmouth. 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: With an efficient thermal swimsuit, one can navigate 55.9°F (13.3°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.
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, in Portsmouth, sunrise is at 7:17 am and sunset at 5:35 pm EDT.
Sunshine
The average sunshine in October is 6.1h.UV index
The average daily maximum UV index in October is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 3 in October translates into these instructions:
Undertake precautions - Guarding against sun damage is counselled. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
What are October temperatures in Portsmouth?
What is the average humidity in October in Portsmouth?
What is the wettest month in Portsmouth?
How many days does it rain in October in Portsmouth?
When does it start snowing in Portsmouth?
What is the ocean temperature in October 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 in Portsmouth?
How high is the UV index in October in Portsmouth?
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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