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October Weather in Portsmouth, United States

Last updated: June 24, 2025

In Portsmouth, United States, the average temperature in October hovers around 15°C (60°F). Expect a minimum of 3°C (37°F) and a maximum of 23°C (74°F). This month also brings an average precipitation of 169 mm (6.7 in) over 13 days, contributing to an average humidity of 75%. Stay prepared for variable weather conditions!

October Temperature in Portsmouth

In October in Portsmouth, the average temperature is 15°C (60°F), with maximums reaching 23°C (74°F) and minimums dropping as low as 3°C (37°F). This pleasant and mild weather makes Portsmouth an ideal destination for travelers seeking comfortable temperatures and outdoor activities.

October Weather in Portsmouth: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Portsmouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portsmouth, October typically has an average temperature of 15°C (60°F), with highs reaching up to 23°C (74°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec353638465464727267594839
Data source: Temperature data for Portsmouth generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Portsmouth

In Portsmouth in October, the total precipitation amount is 169 mm (6.7 in) over the course of 13 days, reflecting a moderate level of rainfall for that time of year.

October Precipitation Trends in Portsmouth

The chart displays monthly precipitation patterns in Portsmouth, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Portsmouth, October typically receives around 169 mm (6.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9612111914713310410489110169117147
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Portsmouth

In Portsmouth in October, humidity is 75%. With an average temperature of 15°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities slightly uncomfortable and requiring extra hydration while exploring the sights.

October Average Humidity in Portsmouth

This chart illustrates the average monthly humidity levels in Portsmouth, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Portsmouth is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Portsmouth

In Portsmouth in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Portsmouth, you can refer to this Hourly UV Index in Portsmouth.

Maximum UV Index Levels in Portsmouth for October

The chart shows the monthly maximum UV Index (UVI) for Portsmouth in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Portsmouth typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Portsmouth October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Portsmouth Compares to Other Months

Weather in Portsmouth varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Portsmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Portsmouth, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)95 mm (3.8 inches)84%moderate
February Weather2°C (36°F)121 mm (4.8 inches)84%moderate
March Weather3°C (39°F)119 mm (4.7 inches)82%high
April Weather8°C (46°F)147 mm (5.8 inches)79%very high
May Weather12°C (55°F)132 mm (5.2 inches)75%very high
June Weather18°C (64°F)104 mm (4.1 inches)78%very high
July Weather22°C (72°F)104 mm (4.1 inches)76%very high
August Weather22°C (73°F)89 mm (3.5 inches)76%very high
September Weather20°C (67°F)110 mm (4.3 inches)75%very high
October Weather15°C (60°F)169 mm (6.7 inches)75%high
November Weather9°C (48°F)117 mm (4.6 inches)80%moderate
December Weather4°C (39°F)147 mm (5.8 inches)80%low

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