Click on a day for an hourly weather forecast
The temperatures in Harjumaa in September are usually low and can range between 10°C and 16°C.
You can expect about 3 to 8 days of rain in Harjumaa 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 Harjumaa in September 2025.
If you’re planning to visit Harjumaa in the near future, we highly recommend that you review the 14 day weather forecast for Harjumaa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -5° | 7 | 5 | 22 | 83 mm | Awful | Harjumaa in January |
| February | -2° / -5° | 6 | 3 | 21 | 71 mm | Awful | Harjumaa in February |
| March | 1° / -3° | 10 | 5 | 19 | 67 mm | Awful | Harjumaa in March |
| April | 7° / 1° | 7 | 15 | 8 | 60 mm | Awful | Harjumaa in April |
| May | 13° / 6° | 6 | 24 | 1 | 77 mm | Ok | Harjumaa in May |
| June | 18° / 11° | 7 | 23 | 0 | 114 mm | Ok | Harjumaa in June |
| July | 21° / 14° | 8 | 23 | 0 | 131 mm | Ok | Harjumaa in July |
| August | 20° / 14° | 8 | 23 | 0 | 139 mm | Ok | Harjumaa in August |
| September | 16° / 10° | 7 | 23 | 0 | 106 mm | Ok | Harjumaa in September |
| October | 9° / 5° | 10 | 18 | 4 | 108 mm | Awful | Harjumaa in October |
| November | 5° / 2° | 10 | 12 | 8 | 93 mm | Awful | Harjumaa in November |
| December | 1° / -2° | 9 | 5 | 20 | 91 mm | Awful | Harjumaa in December |