Click on a day for an hourly weather forecast
The temperatures in Bethesda in September are comfortable with low of 17°C and and high up to 26°C.
You can expect rain for roughly half of the month of September in Bethesda. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Bethesda in September 2025.
If you’re planning to visit Bethesda in the near future, we highly recommend that you review the 14 day weather forecast for Bethesda before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / -2° | 7 | 21 | 3 | 79 mm | Awful | Bethesda in January |
| February | 7° / -1° | 8 | 17 | 4 | 86 mm | Awful | Bethesda in February |
| March | 12° / 3° | 7 | 22 | 2 | 96 mm | Awful | Bethesda in March |
| April | 18° / 8° | 7 | 23 | 0 | 114 mm | Ok | Bethesda in April |
| May | 24° / 14° | 10 | 21 | 0 | 113 mm | Good | Bethesda in May |
| June | 29° / 18° | 10 | 20 | 0 | 123 mm | Ok | Bethesda in June |
| July | 31° / 21° | 11 | 20 | 0 | 138 mm | Ok | Bethesda in July |
| August | 30° / 21° | 11 | 20 | 0 | 119 mm | Ok | Bethesda in August |
| September | 26° / 17° | 8 | 22 | 0 | 118 mm | Good | Bethesda in September |
| October | 20° / 11° | 7 | 25 | 0 | 117 mm | Ok | Bethesda in October |
| November | 13° / 5° | 5 | 25 | 0 | 78 mm | Ok | Bethesda in November |
| December | 8° / 1° | 7 | 23 | 1 | 109 mm | Bad | Bethesda in December |