Weather in Nepean, Ontario, Canada in August
In an average August, Nepean sees a daily high around 25°C and a low around 14°C, based on 1981–2026 of local climate records.
| Average high | 25°C |
|---|---|
| Typical high range | 21°C to 29°C |
| Average low | 14°C |
| Typical low range | 10°C to 18°C |
| Average daily precipitation | 3 mm |
August records
The most extreme August on record for each metric, across 1981–2026. For rainfall, the wettest and driest are by total August accumulation.
High
Highest
35°C
2025-08-12
Lowest
12°C
1985-08-30
Low
Highest
22°C
1988-08-14
Lowest
3°C
1982-08-29
Feels-like
Highest
53°C
2024-08-02
Lowest
0°C
1982-08-29
Humidity
Highest
21.8 g/m³
2006-08-01
Lowest
5.7 g/m³
1982-08-28
Wind
Highest
21 km/h
2011-08-28
Lowest
5 km/h
2015-08-18
Precip
Wettest
154 mm
2022
Driest
37 mm
2002
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