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April Weather in Portsmouth, United States

Last updated: June 24, 2025

In April, the average temperature in Portsmouth, United States hovers around 8°C (46°F), with daily variations ranging from a chilly 0°C (32°F) to a mild 17°C (64°F). Be prepared for 147 mm (5.8 in) of precipitation over approximately 12 days, and expect the air to feel fairly humid with an average humidity level of 79%.

April Temperature in Portsmouth

In April in Portsmouth, the average temperature is 8°C (46°F). Maximum temperatures can reach 17°C (64°F), while minimums may drop as low as 0°C (32°F). This mild climate makes Portsmouth a pleasant destination for travelers seeking cooler weather experiences.

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

The chart illustrates April 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, April typically has an average temperature of 8°C (46°F), with highs reaching up to 17°C (64°F) and lows dropping to around 0°C (32°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.

April Precipitation in Portsmouth

In Portsmouth in April, the precipitation amount is 147 mm (5.8 in) over a span of 12 days.

April Precipitation Trends in Portsmouth

The chart displays monthly precipitation patterns in Portsmouth, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Portsmouth, April typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec9612111914713310410489110169117147
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Portsmouth

In Portsmouth in April humidity is 79%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities a bit less enjoyable and leading travelers to seek cozy, warm spots to regain their comfort.

April Average Humidity in Portsmouth

This chart illustrates the average monthly humidity levels in Portsmouth, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Portsmouth is approximately 79%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Portsmouth

In Portsmouth in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Portsmouth.

Maximum UV Index Levels in Portsmouth for April

The chart shows the monthly maximum UV Index (UVI) for Portsmouth in April, 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 April, the maximum UV index in Portsmouth typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Portsmouth April 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 April 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 April’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 April’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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