Click on a day for an hourly weather forecast
The temperatures in Johnson City in September are comfortable with low of 13°C and and high up to 26°C.
You can expect about 3 to 8 days of rain in Johnson City during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Johnson City in September 2025.
If you’re planning to visit Johnson City in the near future, we highly recommend that you review the 14 day weather forecast for Johnson City before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / -4° | 9 | 10 | 12 | 136 mm | Awful | Johnson City in January |
| February | 9° / -2° | 9 | 10 | 10 | 144 mm | Awful | Johnson City in February |
| March | 13° / 2° | 9 | 16 | 5 | 140 mm | Awful | Johnson City in March |
| April | 18° / 7° | 8 | 20 | 2 | 150 mm | Bad | Johnson City in April |
| May | 24° / 11° | 10 | 21 | 0 | 162 mm | Good | Johnson City in May |
| June | 28° / 14° | 8 | 22 | 0 | 141 mm | Good | Johnson City in June |
| July | 29° / 16° | 9 | 22 | 0 | 174 mm | Ok | Johnson City in July |
| August | 29° / 15° | 7 | 24 | 0 | 133 mm | Ok | Johnson City in August |
| September | 26° / 13° | 6 | 24 | 0 | 121 mm | Perfect | Johnson City in September |
| October | 20° / 8° | 6 | 24 | 1 | 121 mm | Good | Johnson City in October |
| November | 13° / 2° | 6 | 22 | 3 | 106 mm | Bad | Johnson City in November |
| December | 9° / 0° | 8 | 16 | 7 | 145 mm | Awful | Johnson City in December |