Weather in City of Portsmouth in September

General weather information about City of Portsmouth

Average annual temperature is 10.3 °C

Absolute maximum temperature: 31.0 °C

Absolute minimum temperature: -25.9 °C

Number of sunny days: 162 days

Number of rainy days: 192 days

Number of snow days: 11 days

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* Weather data for City of Portsmouth United States is based on climate observations for 2026 year

City of Portsmouth air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)11.914.514.525.230.228.130.929.131.027.518.015.0
Average daytime temperature (°C)4.74.36.513.019.221.026.824.622.618.18.66.8
Average temperature (°C)1.2-1.02.48.413.616.822.720.318.413.44.02.8
Average night temperature (°C)-1.7-5.5-1.34.58.513.419.216.515.19.70.3-0.4
Absolute minimum temperature (°C)-9.0-25.9-5.4-3.92.58.514.813.58.02.0-5.7-7.7

City of Portsmouth monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.715.315.013.912.511.09.79.1
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)4.16.47.38.811.78.810.09.98.07.77.05.0
Precipitation (mm)15847115117891191701451278648169
Sunny days913151620761112152117
Rainy days18101414112325201816914
Snow days452000000000

City of Portsmouth - weather forecast by months

City of Portsmouth weather in januaryCity of Portsmouth weather in februaryCity of Portsmouth weather in marchCity of Portsmouth weather in aprilCity of Portsmouth weather in mayCity of Portsmouth weather in juneCity of Portsmouth weather in julyCity of Portsmouth weather in augustCity of Portsmouth weather in septemberCity of Portsmouth weather in octoberCity of Portsmouth weather in novemberCity of Portsmouth weather in december

Best time to visit City of Portsmouth:

The best time to visit City of Portsmouth during the most sunny months:

  • May — 11.7(h)
  • July — 10.0(h)
  • August — 9.9(h)

Months with the longest average daylight duration in City of Portsmouth:

  • June — 15.3(h)

The largest precipitation sum in City of Portsmouth is at

  • January — 158(mm)
  • July — 170(mm)
  • December — 169(mm)

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    Frequently asked questions

    When is the best time to visit City of Portsmouth?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit City of Portsmouth.
    What is the weather like in City of Portsmouth?
    See average temperature, rainfall and daylight hours for City of Portsmouth by month in the table above.
    How many sunny days does City of Portsmouth have?
    The monthly weather statistics above show sunshine and rainfall patterns for City of Portsmouth throughout the year.