Climate averages 1991–2020
Sollentuna weather
in September.
A mild, moderately wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Sollentuna: daytime highs average 15.6°C and nights cool to about 9.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 50 mm of rain on roughly 9 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 56 min on an average September day.
The nearest other city in this atlas is Stockholm (13 km away). In September its highs average 15.5°C, about as warm as Sollentuna, with 50 mm of rain.
Among the 21 cities listed in Sweden, Sollentuna ranks joint 10th of 21 for the warmest September highs and joint 3rd of 21 for the driest September (rainfall, lowest first). The mean September high of those 21 cities is 15.5°C; Sollentuna is 0.1°C warmer than that mean.
From September to October, average highs fall by 6.3°C to 9.3°C, and monthly rainfall falls from 50 mm to 48 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sollentuna climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 0.0°C-3.8°C | -3.8°C | 35 | 7.9 | 6.97 h |
| February | 0.4°C-4.3°C | -4.3°C | 29 | 7.8 | 9.29 h |
| March | 3.8°C-2.4°C | -2.4°C | 29 | 7.7 | 11.812 h |
| April | 9.4°C1.6°C | 1.6°C | 33 | 8.0 | 14.514 h |
| May | 14.7°C6.5°C | 6.5°C | 44 | 9.5 | 17.017 h |
| June | 18.7°C11.2°C | 11.2°C | 68 | 11.0 | 18.518 h |
| July | 21.5°C14.3°C | 14.3°C | 70 | 11.5 | 17.818 h |
| August | 20.4°C13.9°C | 13.9°C | 72 | 12.2 | 15.616 h |
| September, selected | 15.6°C9.9°C | 9.9°C | 50 | 8.5 | 12.913 h |
| October | 9.3°C5.0°C | 5.0°C | 48 | 9.6 | 10.310 h |
| November | 4.4°C1.2°C | 1.2°C | 45 | 10.0 | 7.78 h |
| December | 1.3°C-2.2°C | -2.2°C | 43 | 10.1 | 6.26 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Stockholm in SeptemberSweden · 13 kmHigh 15.5°C · Low 10.5°C · 50 mm rain
- Huddinge in SeptemberSweden · 21 kmHigh 15.5°C · Low 10.5°C · 50 mm rain
- Haninge in SeptemberSweden · 31 kmHigh 15.1°C · Low 10.4°C · 51 mm rain
- Södertälje in SeptemberSweden · 32 kmHigh 15.9°C · Low 9.8°C · 51 mm rain
- Uppsala in SeptemberSweden · 51 kmHigh 15.6°C · Low 9.1°C · 49 mm rain
- Västerås in SeptemberSweden · 82 kmHigh 15.8°C · Low 9.1°C · 52 mm rain
- Mariehamn in SeptemberAland Islands · 134 kmHigh 14.3°C · Low 11.8°C · 54 mm rain
- Norrköping in SeptemberSweden · 137 kmHigh 16.0°C · Low 10.2°C · 52 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sollentuna) is explained once on the Sollentuna year overview and on the Sources, method and limits page.