Valparaiso Weather in September

What's the weather like in Valparaiso (Indiana) in September 2025?

The climate in Valparaiso during September can be summarized as mild and a little damp.

September is in the fall / autumn in Valparaiso and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 11°C (52°F) is normal.

Valparaiso weather averages (imperial / metric)
Daytime temperature 24.2°C 75.5°F
Nightly temperature 11.3°C 52.3°F
Average temperature 17.7°C 63.9°F
Daily sunshine 8.4 hrs
Avg rainfall 91 mm 3.6 ins
Rainy days 9 days
Sea temperature 19.7°C 67.5°F
Humidity 73%
Windspeed 14.8kph 9 mph

On average September is the 4th wettest month of the year in Valparaiso with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.4 hours of sunshine per day.

September temperatures in Valparaiso

Valparaiso average temperature in September

September rainfall

Valparaiso average rain in September

September hourly sunshine

Valparaiso 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 Valparaiso 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

Valparaiso weather stats

Valparaiso weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 40mm 1.6ins
Sunniest month: July 11hrs
Coldest month: January -1.4°C 29.5°F
Wettest month: June 108mm 4.3ins
Map showing location of Valparaiso (41.47309, -87.06114) Valparaiso map pin © Google

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