Climate averages 1991–2020
Meridian 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 Meridian: daytime highs average 17.6°C and nights cool to about 6.0°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 20 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 Boise (15 km away). In October its highs average 17.7°C, about as warm as Meridian, with 22 mm of rain.
Among the 498 cities listed in the United States, Meridian ranks joint 336th of 498 for the warmest October highs and joint 68th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Meridian 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 20 mm to 30 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
Meridian 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-4.3°C | -4.3°C | 40 | 9.0 | 9.39 h |
| February | 7.0°C-2.5°C | -2.5°C | 26 | 7.4 | 10.510 h |
| March | 12.1°C0.8°C | 0.8°C | 31 | 8.6 | 11.912 h |
| April | 16.1°C3.8°C | 3.8°C | 28 | 6.4 | 13.413 h |
| May | 21.8°C8.6°C | 8.6°C | 29 | 5.9 | 14.715 h |
| June | 26.6°C13.1°C | 13.1°C | 16 | 3.4 | 15.415 h |
| July | 32.7°C18.1°C | 18.1°C | 3.4 | 1.0 | 15.115 h |
| August | 31.8°C17.4°C | 17.4°C | 3.4 | 0.9 | 14.014 h |
| September | 26.1°C12.4°C | 12.4°C | 9.8 | 2.0 | 12.613 h |
| October, selected | 17.6°C6.0°C | 6.0°C | 20 | 4.2 | 11.111 h |
| November | 9.3°C0.0°C | 0.0°C | 30 | 7.3 | 9.710 h |
| December | 3.6°C-3.8°C | -3.8°C | 42 | 9.3 | 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
- Boise in OctoberUnited States · 15 kmHigh 17.7°C · Low 6.3°C · 22 mm rain
- Nampa in OctoberUnited States · 16 kmHigh 18.2°C · Low 6.9°C · 20 mm rain
- Kennewick in OctoberUnited States · 361 kmHigh 18.7°C · Low 7.8°C · 22 mm rain
- Tri-Cities in OctoberUnited States · 367 kmHigh 18.9°C · Low 7.9°C · 22 mm rain
- Bend in OctoberUnited States · 398 kmHigh 15.0°C · Low 2.9°C · 37 mm rain
- Missoula in OctoberUnited States · 408 kmHigh 13.6°C · Low 3.5°C · 44 mm rain
- Ogden in OctoberUnited States · 449 kmHigh 16.1°C · Low 5.0°C · 45 mm rain
- Spokane Valley in OctoberUnited States · 456 kmHigh 14.7°C · Low 4.5°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 Meridian) is explained once on the Meridian year overview and on the Sources, method and limits page.
Nampa lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.