The highest day temperature in July 2025 was 82°F. The lowest night temperature was 52°F. The average values for day and night temperatures during July were 68.9°F и 57.6°F respectivly.

The average sea surface temperature in July 2025 for Saint John was 56.1°F. The maximum and minimum values were 49.8°F and 64.6°F respectively.

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

Precipitation total in July for Saint John is 1.5 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 6.2 mph. It makes July one of the most windless months of the year for Saint John.

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 Saint John in July is 5.9 hours.