The highest day temperature in July 2025 was 82°F. The lowest night temperature was 51°F. The average values for day and night temperatures during July were 68.9°F и 58.0°F respectivly.

The average sea surface temperature in July 2025 for St. John's was 53.3°F. The maximum and minimum values were 47.0°F and 58.6°F respectively.

Most of the days in July are gloomy but you can also expect sunny days.

Precipitation total in July for St. John's is 1.3 in. It makes july the least rainy month of the year.

The average wind speed in July is 10.0 mph. It makes July the most windless month of the year for St. John's.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for St. John's in July is 6.8 hours.