Mount Vernon, Washington Climate by Month
Mount Vernon, Washington, United States
Warm summers and cool winters, with rain spread through the year.
The climate in Mount Vernon is one of warm summers and cool winters, with rain spread through the year. Expect highs of 76°F (25°C) in August and 46°F (8°C) in December, with the coldest nights (December) near 35°F (2°C). It gets 36 in (921 mm) of rain a year, spread across the months.
- Warmest month
- 76°F(25°C)
- Average high, August
- Coldest nights
- 35°F(2°C)
- Average low, December
- Rain per year
- 36 in(921 mm)
- No clear rainy season
- Humidity
- 74%
- Sunniest: July
Best and worst months in Mount Vernon
Best for weatherThe most comfortable weather comes in July and August, with highs around 76°F (24°C) and about 1.1 in (29 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 46°F (8°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Mount Vernon weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(8°C) | 36°F(2°C) | 4.6 in(118 mm) | 80% | 0.9 |
| FebFebruary | 50°F(10°C) | 36°F(2°C) | 2.8 in(70 mm) | 75% | 1.9 |
| MarMarch | 53°F(12°C) | 38°F(4°C) | 3.5 in(88 mm) | 76% | 2.6 |
| AprApril | 59°F(15°C) | 42°F(6°C) | 2.8 in(72 mm) | 72% | 4.2 |
| MayMay | 65°F(19°C) | 47°F(9°C) | 2.3 in(59 mm) | 71% | 5.1 |
| JunJune | 70°F(21°C) | 51°F(11°C) | 2.1 in(54 mm) | 67% | 5.4 |
| JulJulyBest | 75°F(24°C) | 54°F(12°C) | 1.0 in(26 mm) | 68% | 6.0 |
| AugAugustBest | 76°F(25°C) | 54°F(12°C) | 1.3 in(32 mm) | 66% | 5.1 |
| SepSeptember | 71°F(21°C) | 50°F(10°C) | 2.1 in(54 mm) | 73% | 3.6 |
| OctOctober | 60°F(16°C) | 43°F(6°C) | 3.7 in(95 mm) | 84% | 1.9 |
| NovNovember | 52°F(11°C) | 39°F(4°C) | 5.4 in(138 mm) | 78% | 1.0 |
| DecDecember | 46°F(8°C) | 35°F(2°C) | 4.5 in(115 mm) | 81% | 0.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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