Heppner Weather in September

What's the weather like in Heppner (Oregon) in September 2025?

The climate in Heppner during September can be summarized as mild and dry.

September is in the fall / autumn in Heppner and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 7°C (44°F) is normal.

Heppner weather averages (imperial / metric)
Daytime temperature 23.8°C 74.8°F
Nightly temperature 6.9°C 44.3°F
Average temperature 15.3°C 59.5°F
Daily sunshine 9.8 hrs
Avg rainfall 19 mm 0.7 ins
Rainy days 5 days
Sea temperature 13.4°C 56.1°F
Humidity 50%
Windspeed 13kph 8 mph

On average September is the 3rd driest month of the year in Heppner with around 19mm 0.7 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.8 hours of sunshine per day.

September temperatures in Heppner

Heppner average temperature in September

September rainfall

Heppner average rain in September

September hourly sunshine

Heppner average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Heppner in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Heppner weather stats

Heppner weather statistics
Hottest month: July 28.6°C 83.5°F
Driest month: July 9mm 0.4ins
Sunniest month: July 13.1hrs
Coldest month: January 4.8°C 40.6°F
Wettest month: November 45mm 1.8ins
Map showing location of Heppner (45.35318, -119.5578) Heppner map pin © Google

Locations nearby

Top United States locations