Climate averages 1991–2020
Busto Arsizio weather
in September.
A warm, wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Busto Arsizio: daytime highs average 22.2°C and nights cool to about 13.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 134 mm of rain on roughly 10 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 35 min on an average September day.
The nearest other city in this atlas is Varese (23 km away). In September its highs average 20.7°C, 1.5°C cooler than Busto Arsizio, with 163 mm of rain.
Among the 79 cities listed in Italy, Busto Arsizio ranks joint 70th of 79 for the warmest September highs and joint 72nd of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.3°C; Busto Arsizio is 2.1°C cooler than that mean.
From September to October, average highs fall by 5.5°C to 16.7°C, and monthly rainfall rises from 134 mm to 140 mm.
The annual picture
September in context
Monthly rainfall
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
Busto Arsizio climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.8°C-0.9°C | -0.9°C | 63 | 6.5 | 9.19 h |
| February | 8.8°C-0.5°C | -0.5°C | 66 | 6.6 | 10.310 h |
| March | 13.3°C2.7°C | 2.7°C | 79 | 7.9 | 11.912 h |
| April | 16.8°C6.6°C | 6.6°C | 113 | 11.2 | 13.513 h |
| May | 21.0°C11.2°C | 11.2°C | 126 | 12.4 | 14.915 h |
| June | 25.3°C15.4°C | 15.4°C | 115 | 11.1 | 15.616 h |
| July | 27.8°C18.0°C | 18.0°C | 83 | 9.1 | 15.315 h |
| August | 27.3°C18.0°C | 18.0°C | 113 | 10.8 | 14.114 h |
| September, selected | 22.2°C13.8°C | 13.8°C | 134 | 9.9 | 12.613 h |
| October | 16.7°C9.5°C | 9.5°C | 140 | 10.2 | 11.011 h |
| November | 11.1°C4.5°C | 4.5°C | 163 | 10.2 | 9.510 h |
| December | 7.1°C-0.1°C | -0.1°C | 74 | 7.0 | 8.89 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
- Varese in SeptemberItaly · 23 kmHigh 20.7°C · Low 13.2°C · 163 mm rain
- Novara in SeptemberItaly · 25 kmHigh 23.1°C · Low 14.0°C · 159 mm rain
- Como in SeptemberItaly · 28 kmHigh 22.0°C · Low 14.4°C · 155 mm rain
- Cinisello Balsamo in SeptemberItaly · 29 kmHigh 22.4°C · Low 13.9°C · 119 mm rain
- Milan in SeptemberItaly · 31 kmHigh 22.8°C · Low 14.0°C · 119 mm rain
- Monza in SeptemberItaly · 33 kmHigh 22.2°C · Low 13.6°C · 119 mm rain
- Bergamo in SeptemberItaly · 64 kmHigh 21.6°C · Low 12.8°C · 134 mm rain
- Alessandria in SeptemberItaly · 80 kmHigh 23.8°C · Low 14.2°C · 86 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 Busto Arsizio) is explained once on the Busto Arsizio year overview and on the Sources, method and limits page.