Here’s your day-by-day breakdown for August 2024 in Saint John, NB. The data combines average daily highs & lows with the actual recorded extremes for each day:

Climate Overview for September 2024

Temperatures

• Average daily high temperatures started around 20 °C (68 °F) at the beginning of the month, gradually decreasing to about 16 °C (60 °F) by the end 

• Average lows dipped from about 12 °C (53 °F) to around 8 °C (46 °F) over the course of the month

• The overall mean temperature hovered near 13 °C (55 °F), with typical overnight lows around 8 °C and daily highs around 18 °C

• Precipitation

• The month saw average total rainfall of approximately 111 mm (4.4 inches) spread over about 13 wet days

• Rainfall probability per day rose from ~24% at the start to ~29% by month’s end, with cumulative totals increasing from ~2.8 inches to ~3.7 inches over a 31‑day rolling period

Cloud Cover & Sunlight

• Generally cloudy or overcast conditions persisted about 40–60% of the time, with skies clearest (~62% clear) around early September and cloudiest (~58–60%) toward month‑end 

• Average daylight hours declined from approximately 13h 15m on September 1 to around 11h 44m on September 30 

• Daily sunlight (direct solar energy) averaged about 5.2 kWh/m² early in September, fading to roughly 3.8 kWh/m² by month’s end 

Wind & Water Temperature

• Wind speeds gradually increased from an average of 6.5 mph to about 7.8 mph over the month, typically from southern directions 

• Ocean surface temperatures cooled slightly from 56 °F to about 54 °F over September 

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Summary Table: September 2024 – Saint John, NB

Temperature

• Average high: ~21 °C (70 °F); typical for July is around 22 °C .

• Average low: ~14 °C (56 °F); usual lows are near 12 °C .

• Overall mean: ~17 °C (62 °F) .

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🌧️ Precipitation

• Total rainfall: ~124 mm (4.9 in) 

• Rainy days: About 6 days with measurable rain .

• Climate average context: Historically, July sees ~104 mm of rain over ~13 days . So July 2024 was a bit wetter on fewer days—meaning some heavier showers occurred.

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☀️ Sunlight & Cloud Cover

• Sunlight per day: Around 7 hours 13 minutes of sunshine

• Daylight duration: Approximately 15 hours 16 minutes average for July .

• Sun/cloud distribution: Roughly 48 % sunny and 52 % cloudy daylight .

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📊 Comparison with Long-Term Averages

Temperature

• Average high: Around 20 °C (68 °F)

• Average low: About 8–11 °C (46–52 °F)

• Early-month extremes:

  • Daily low dipped to ~3.4 °C on June 1 at YQM Moncton (nearby proxy)

  • June 20: A record-breaking spike with 34.5 °C recorded at Saint John Airport — the highest June temperature on record locally

Local reports from June 21–22 confirmed mid-30s°C readings, with Reddit users noting:

 

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🌧️ Precipitation & Humidity

• Total rainfall: Approximately 96 mm — close to normal for June

• Rainy days: Around 12–13 days with measurable precipitation

• Humidity: Mean relative humidity hovered between 70–82%

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☀️ Sunshine, Sea & Daylight

• Average sunshine: About 7–8 hours/day

• Sea temperature: Cold, averaging 6–9 °C (43–49 °F) — chilly for swimming

• Daylight: Long summer days with ~15½ hours, sunrise ~5:40 am, sunset ~9:10 pm local time

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⚠️ Notable Events

• Heat dome from June 18–20 pushed highs past 30°C for several days

• Severe thunderstorms and even tiny tornadoes (EF‑0) touched down in central and northern NB on June 30

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✅ June 2024 Summary: Saint John, NB

• Temperatures: Normals around 20 °C (range 8–11 °C), but experienced an exceptional heatwave hitting a record 34.5 °C.

• Rainfall: Near-normal, ~96 mm spread over ~13 days.

• Sunshine & daylight: Warm and long sunny days, but coastal sea temp remained brisk (~6–9 °C).

• Severe weather: Heat dome and late-month storms with minor tornadic activity.

Date	High (°C)	Low (°C)

May 2024 Overview (Historical Averages)