St John's weather in August 2025

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in St John's in August. Check more long-term weather averages for St John's in August before you book your next holiday to Newfoundland & Labrador in 2025/2026.

  • 20°C maximum daytime temperature in August in St John's20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in August in St John's14
    14 days with some rainfall
  • 11°C minimum night-time temperature in August in St John's11
    11°C min night temperature
  • 14 hours of daylight per day in August in St John's14
    14 hours of daylight per day
  • No heat & humidity in August in St John's0
    No heat & humidity
  • 119 mm monthly rainfall in August in St John's119
    119 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in St John's6
    6 (High) UV index
  • 14°C sea temperature in August in St John's14
    14°C sea temperature

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The August weather guide for Newfoundland & Labrador (St John's) 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's in August?

Daytime temperatures usually reach 20°C in St John's in August, falling to 11°C at night.

How sunny is it in St John's in August?

There are normally 6 hours of bright sunshine each day in St John's in August - that's 42% of daylight hours.

How warm is the sea around St John's in August?

The average sea temperature around St John's in August is 14°C.

Does it rain in St John's in August?

There are usually 14 days with some rain in St John's in August and the average monthly rainfall is 119mm.

St John's August sunrise & sunset times

Browse the sunrise and sunset times for St John's in August 2025. Select a month to view St John's sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:39 19:35
Saturday, 16th August 2025 04:59 19:11
Sunday, 31st August 2025 05:19 18:43

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