Click on a day for an hourly weather forecast
The temperatures in Hyvinkaa in September are quite cold with temperatures between 8°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Hyvinkaa 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 Hyvinkaa in September 2025.
If you’re planning to visit Hyvinkaa in the near future, we highly recommend that you review the 14 day weather forecast for Hyvinkaa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -8° | 5 | 3 | 25 | 79 mm | Awful | Hyvinkaa in January |
| February | -3° / -8° | 5 | 2 | 22 | 76 mm | Awful | Hyvinkaa in February |
| March | 1° / -5° | 6 | 5 | 21 | 69 mm | Awful | Hyvinkaa in March |
| April | 7° / 0° | 7 | 13 | 10 | 57 mm | Awful | Hyvinkaa in April |
| May | 15° / 6° | 5 | 25 | 1 | 57 mm | Good | Hyvinkaa in May |
| June | 20° / 10° | 4 | 26 | 0 | 55 mm | Good | Hyvinkaa in June |
| July | 23° / 13° | 4 | 27 | 0 | 64 mm | Perfect | Hyvinkaa in July |
| August | 21° / 12° | 3 | 28 | 0 | 54 mm | Good | Hyvinkaa in August |
| September | 15° / 8° | 5 | 25 | 0 | 48 mm | Good | Hyvinkaa in September |
| October | 8° / 3° | 7 | 20 | 4 | 73 mm | Awful | Hyvinkaa in October |
| November | 3° / 0° | 9 | 11 | 10 | 85 mm | Awful | Hyvinkaa in November |
| December | -1° / -4° | 7 | 3 | 21 | 86 mm | Awful | Hyvinkaa in December |