Rockville Weather in September

September in Rockville brings high temperatures around 26°C (79°F) during the day, dropping to 15°C (59°F) at night, with quite a bit of rainfall expected, averaging around 112 mm (4.4 in) for the month.

Rainfall in Rockville in September

Looking at the last 30 years, the data shows about 9 days with rain, averaging 112 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 Rockville in September

September in Rockville brings high temperatures, with highs of 26°C (79°F) and nights around 15°C (59°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 15°C (59°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Rockville in September

With approximately 225 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

If you prefer dry days with pleasant temperatures, August typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.