St John weather in August 2026

Expect daytime maximum temperatures of 21°C in St John, New Brunswick in August based on long-term weather averages. There are 7 hours of sunshine per day on average with 12 days with some rainfall and typically 97 mm of rainfall in the month.

  • 21°C maximum daytime temperature in August in St John21
    21°C max day temperature
  • 7 hours of sunshine per day
  • 12 days with some rainfall in August in St John12
    12 days with some rainfall
  • 13°C minimum night-time temperature in August in St John13
    13°C min night temperature
  • 14 hours of daylight per day in August in St John14
    14 hours of daylight per day
  • No heat & humidity in August in St John0
    No heat & humidity
  • 97 mm monthly rainfall in August in St John97
    97 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in St John7
    7 (High) UV index
  • 13°C sea temperature in August in St John13
    13°C sea temperature

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The August weather guide for New Brunswick (St John) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in St John in August?

Daytime temperatures usually reach 24°C in St John in August, falling to 12°C at night.

How sunny is it in St John in August?

There are normally 7 hours of bright sunshine each day in St John in August - that's 50% of daylight hours.

Does it rain in St John in August?

There are usually 12 days with some rain in St John in August and the average monthly rainfall is 94mm.

St John August sunrise & sunset times

Browse the sunrise and sunset times for St John in August 2026. Select a month to view St John sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st August 2026 05:09 19:52
Sunday, 16th August 2026 05:27 19:30
Monday, 31st August 2026 05:45 19:03

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