Bellevue Weather in September

September in Bellevue sees daytime temperatures around 20°C (68°F) and lows of 10°C (50°F) at night. With around 122 mm (4.8 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Bellevue in September

This month experiences about 12 days of rain according to historical data, averaging 122 mm (4.8 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Bellevue in September

In September, Bellevue gets pleasant temperatures, with highs of 20°C (68°F). Nights cool to around 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Bellevue in September

With about 183 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Average water temperature in September

With water at 20°C (68°F), conditions are good for swimming and other water activities. You won't need a wetsuit and most people find it very comfortable.

If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Bellevue.