Climate averages 1991–2020
Milpitas weather
in September.
A hot, very dry month: the 3rd warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Milpitas: daytime highs average 28.0°C and nights cool to about 16.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 1.9 mm of rain on fewer than one day, which makes September a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 28 min on an average September day.
The nearest other city in this atlas is San Jose (10 km away). In September its highs average 27.8°C, about as warm as Milpitas, with 2.5 mm of rain.
Among the 498 cities listed in the United States, Milpitas ranks joint 204th of 498 for the warmest September highs and joint 23rd of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Milpitas is 1.1°C warmer than that mean.
From September to October, average highs fall by 3.9°C to 24.1°C, and monthly rainfall rises from 1.9 mm to 23 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
Milpitas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.8°C6.5°C | 6.5°C | 91 | 8.9 | 9.910 h |
| February | 15.8°C7.5°C | 7.5°C | 96 | 9.1 | 10.811 h |
| March | 17.6°C8.7°C | 8.7°C | 75 | 9.1 | 11.912 h |
| April | 19.4°C9.5°C | 9.5°C | 40 | 5.7 | 13.113 h |
| May | 22.3°C11.3°C | 11.3°C | 19 | 3.4 | 14.214 h |
| June | 25.9°C13.3°C | 13.3°C | 4.0 | 0.9 | 14.715 h |
| July | 28.5°C15.3°C | 15.3°C | 0.9 | 0.2 | 14.514 h |
| August | 28.7°C15.7°C | 15.7°C | 1.0 | 0.2 | 13.614 h |
| September, selected | 28.0°C16.0°C | 16.0°C | 1.9 | 0.4 | 12.512 h |
| October | 24.1°C13.8°C | 13.8°C | 23 | 2.9 | 11.311 h |
| November | 18.2°C9.9°C | 9.9°C | 43 | 5.7 | 10.210 h |
| December | 14.5°C6.8°C | 6.8°C | 83 | 8.9 | 9.610 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
- San Jose in SeptemberUnited States · 10 kmHigh 27.8°C · Low 15.6°C · 2.5 mm rain
- Sunnyvale in SeptemberUnited States · 13 kmHigh 26.7°C · Low 15.2°C · 2.5 mm rain
- Fremont in SeptemberUnited States · 15 kmHigh 27.2°C · Low 15.4°C · 1.9 mm rain
- Mountain View in SeptemberUnited States · 16 kmHigh 26.1°C · Low 15.0°C · 1.9 mm rain
- Union City in SeptemberUnited States · 21 kmHigh 27.4°C · Low 15.1°C · 1.9 mm rain
- Pleasanton in SeptemberUnited States · 26 kmHigh 28.0°C · Low 14.4°C · 1.7 mm rain
- Redwood City in SeptemberUnited States · 30 kmHigh 24.6°C · Low 14.5°C · 1.8 mm rain
- Livermore in SeptemberUnited States · 31 kmHigh 28.3°C · Low 14.3°C · 1.7 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 Milpitas) is explained once on the Milpitas year overview and on the Sources, method and limits page.
Fremont, Mountain View and Union City lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.