Bethesda Weather in September

September in Bethesda brings high temperatures, with highs of 26°C (79°F) and nights dropping to 15°C (59°F). Rainfall is on the higher side this month, averaging around 108 mm (4.3 in), so keep a rain jacket handy.

Rainfall in Bethesda in September

Based on our climate data of the past 30 years, about 9 days of rain are anticipated, with 108 mm (4.3 in) on average. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Bethesda in September

September in Bethesda sees highs of 26°C (79°F) and lows of 15°C (59°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Bethesda in September

The city usually sees around 225 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Bethesda in September

September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

If your ideal day consists of dry skies and pleasant temperatures, April typically offers the best circumstances for Bethesda.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Bethesda's climate page.

Bethesda Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 26°C (79°F)  

Chance of Rain 30%  

Precipitation 108 mm (4.3 in)  

Rainy days 9 days  

Humidity 68% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 225 hours *  

Percentage Sunshine 60% *  

* Data from: Washington DC, the United States of America (15 KM, 9 Miles).

What to Wear in Bethesda in September

Warm but pleasant conditions in Bethesda in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Bethesda in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Bethesda's climate page.

More climate data for Bethesda

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Bethesda climate overview or explore weather in the United States of America.