Climate averages 1991–2020
Boise weather
in October.
A mild, fairly dry month: the 6th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Boise: daytime highs average 17.7°C and nights cool to about 6.3°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 22 mm of rain on roughly 4 days, which makes October a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 04 min on an average October day.
The nearest other city in this atlas is Meridian (15 km away). In October its highs average 17.6°C, about as warm as Boise, with 20 mm of rain.
Among the 498 cities listed in the United States, Boise ranks joint 329th of 498 for the warmest October highs and joint 92nd of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Boise is 3.7°C cooler than that mean.
From October to November, average highs fall by 8.4°C to 9.3°C, and monthly rainfall rises from 22 mm to 34 mm.
The annual picture
October 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
Boise climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.8°C-4.6°C | -4.6°C | 45 | 9.5 | 9.39 h |
| February | 6.8°C-2.5°C | -2.5°C | 31 | 7.7 | 10.510 h |
| March | 11.9°C0.9°C | 0.9°C | 36 | 8.9 | 11.912 h |
| April | 15.9°C3.8°C | 3.8°C | 31 | 7.2 | 13.413 h |
| May | 21.6°C8.5°C | 8.5°C | 31 | 5.9 | 14.715 h |
| June | 26.5°C13.0°C | 13.0°C | 16 | 3.2 | 15.415 h |
| July | 32.7°C17.9°C | 17.9°C | 2.6 | 0.9 | 15.115 h |
| August | 31.9°C17.4°C | 17.4°C | 3.3 | 0.7 | 14.014 h |
| September | 26.2°C12.6°C | 12.6°C | 10 | 2.2 | 12.613 h |
| October, selected | 17.7°C6.3°C | 6.3°C | 22 | 4.3 | 11.111 h |
| November | 9.3°C0.2°C | 0.2°C | 34 | 7.9 | 9.710 h |
| December | 3.7°C-4.1°C | -4.1°C | 50 | 10.1 | 9.09 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
October in nearby cities
- Meridian in OctoberUnited States · 15 kmHigh 17.6°C · Low 6.0°C · 20 mm rain
- Nampa in OctoberUnited States · 30 kmHigh 18.2°C · Low 6.9°C · 20 mm rain
- Kennewick in OctoberUnited States · 370 kmHigh 18.7°C · Low 7.8°C · 22 mm rain
- Tri-Cities in OctoberUnited States · 376 kmHigh 18.9°C · Low 7.9°C · 22 mm rain
- Missoula in OctoberUnited States · 401 kmHigh 13.6°C · Low 3.5°C · 44 mm rain
- Bend in OctoberUnited States · 413 kmHigh 15.0°C · Low 2.9°C · 37 mm rain
- Ogden in OctoberUnited States · 437 kmHigh 16.1°C · Low 5.0°C · 45 mm rain
- Layton in OctoberUnited States · 449 kmHigh 15.9°C · Low 4.9°C · 43 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 Boise) is explained once on the Boise year overview and on the Sources, method and limits page.