Post Falls has a temperate climate with warm summers and freezing winters.
Temperatures peak in August and drop to their lowest in January, while rainfall is highest during autumn months.
Humidity remains moderate throughout the year, especially during winter months, creating cold and damp conditions.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | ☔ | 40.2°F | -2.0°F | 19.1°F | 95% | 96 | 1.0 | 1.11 |
| February | ❄️ | 46.7°F | 3.0°F | 24.9°F | 90% | 72 | 1.1 | 2.04 |
| March | 🌨️ | 59.4°F | 16.0°F | 37.7°F | 82% | 79 | 1.1 | 3.20 |
| April | 🌨️ | 70.1°F | 24.6°F | 47.3°F | 74% | 59 | 1.2 | 4.65 |
| May | 🌤️ | 79.8°F | 29.8°F | 54.8°F | 69% | 63 | 1.1 | 5.85 |
| June | ☀️ | 86.2°F | 37.8°F | 62.0°F | 66% | 53 | 1.1 | 6.52 |
| July | ☀️ | 94.3°F | 45.0°F | 69.7°F | 54% | 23 | 1.0 | 7.23 |
| August | ☀️ | 95.2°F | 45.3°F | 70.3°F | 50% | 22 | 1.0 | 6.02 |
| September | ☀️ | 88.8°F | 35.0°F | 61.9°F | 54% | 31 | 1.0 | 4.39 |
| October | 🌨️ | 74.6°F | 24.7°F | 49.6°F | 68% | 60 | 1.0 | 2.70 |
| November | ☔ | 55.1°F | 13.4°F | 34.2°F | 87% | 107 | 1.0 | 1.31 |
| December | ☔ | 41.1°F | 0.7°F | 20.9°F | 94% | 103 | 1.0 | 0.87 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Pack heavy layers and prepare for snow — this is a Severe Winter destination.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot Summer.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °F
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns make summer ideal for outdoor activities, while winters bring freezing conditions and heavy snowfall.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 95% in January · annual avg 74%
The warmest year in Post Falls's recorded history was 2015 (avg: 50.5°F), while the coldest was 1985 (avg: 39.0°F).
Average annual high/low · Last 10 years · °F
Total annual precipitation · Last 10 years · mm/year
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 26.4°F | 49.8°F | 73.2°F | 754 | 73% | 1.1 m/s |
2024 | 24.3°F | 48.2°F | 72.3°F | 733 | 73% | 1.1 m/s |
2023 | 25.5°F | 48.2°F | 71.1°F | 596 | 72% | 1.0 m/s |
2022 | 20.8°F | 44.8°F | 68.5°F | 802 | 74% | 1.1 m/s |
2021 | 25.7°F | 49.5°F | 73.4°F | 619 | 68% | 1.1 m/s |
2020 | 24.1°F | 48.0°F | 72.0°F | 775 | 73% | 1.1 m/s |
2019 | 21.4°F | 44.6°F | 67.8°F | 587 | 73% | 1.0 m/s |
2018 | 25.9°F | 48.2°F | 70.3°F | 690 | 73% | 1.0 m/s |
2017 | 22.3°F | 44.8°F | 67.5°F | 875 | 75% | 1.0 m/s |
2016 | 25.9°F | 47.8°F | 69.8°F | 792 | 75% | 1.1 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), August is typically the hottest month in Post Falls, Idaho, with average high temperatures around 95.2°F.
January is the coldest month in Post Falls, with average low temperatures around -2.0°F.
November receives the most rainfall with approximately 107 mm, while August is the driest with 22 mm.
The highest recorded temperature was 107.3°F in June 2021. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was -34.4°F in December 1990.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
Post Falls receives the most sunlight in July with an average solar radiation of 7.23 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Idaho.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
