Gaithersburg Weather in September

September in Gaithersburg typically sees daytime highs of 26°C (79°F) and nighttime lows of 15°C (59°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Gaithersburg in September

Typically, you can expect about 9 days of rain this month, with 113 mm (4.4 in) on average. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Gaithersburg in September

Gaithersburg in September gets highs of 26°C (79°F) during the day and drops to 15°C (59°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. 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 Gaithersburg in September

The month enjoys around 225 hours of sunshine, creating mostly sunny days with good weather conditions.

For Gaithersburg itself, August generally stands out with 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.