Merrillville Weather in September

During September, Merrillville experiences high daytime temperatures of 25°C (77°F) and cooler nights around 13°C (55°F). Expect quite a bit of rainfall. Around 111 mm (4.4 in) is typical.

Rainfall in Merrillville in September

Rain is expected on roughly 9 days, totalling around 111 mm (4.4 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Merrillville in September

Temperatures in Merrillville in September top out at 25°C (77°F) and drop to 13°C (55°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Merrillville in September

The month enjoys around 226 hours of sunshine, creating mostly sunny days with good weather conditions.

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