Keizer, United States experiences average highs of 18°C (64°F) and lows of 8°C (46°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have stayed broadly stable across the available records.
Keizer, United States Weather & Climate 2026
Monthly climate averages for Keizer, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.2/10
Best: June, July, August, September
UV Index
4
Low
Temperature 18°C / 8°C
Feels Like 17°C / 6°C
Rainy Days 11
Rainfall 88 mm
Sunshine 8 h
Humidity 74%
Wind Speed 14 km/h
Dew Point 8°C
Snow Days 2 days
Frost Days 6 days
Hottest Month
31°C
August
Avg Low15°C
Rain1days
Coldest Month
2°C
February
Avg High10°C
Rain16days
Driest Month
1days
July
Avg High30°C
Avg Low14°C
Windiest Month
15 km/h
December (Gusts 35)
Worst Time to Visit
Consider avoiding January, February, November, December due to heavy rainfall.
Sun Position
Sunrise 05:26
Daylight 15.6h
Sunset 21:02
Live conditions—
Keizer on the map · live conditions
Keizer, United States
- Continent
- Americas
- Country
- United States
- City
- Keizer
- Population
- 37.9K
- Elevation
- 42 m
- Coordinates
- 44.99°, -123.03°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 6°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 14°C
Rain 2 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 9°C
Rain 11 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 9°C
Avg Low 2°C
Rain 17 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 9°C / 3°C . Feb: 10°C / 2°C . Mar: 13°C / 3°C . Apr: 16°C / 6°C . May: 21°C / 9°C . Jun: 25°C / 12°C . Jul: 30°C / 14°C . Aug: 31°C / 15°C . Sep: 26°C / 13°C . Oct: 18°C / 8°C . Nov: 12°C / 5°C . Dec: 9°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 162 mm. Feb: 128 mm. Mar: 127 mm. Apr: 97 mm. May: 48 mm. Jun: 31 mm. Jul: 4 mm. Aug: 5 mm. Sep: 37 mm. Oct: 96 mm. Nov: 145 mm. Dec: 177 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 86%. Feb: 85%. Mar: 83%. Apr: 77%. May: 71%. Jun: 63%. Jul: 54%. Aug: 54%. Sep: 65%. Oct: 77%. Nov: 86%. Dec: 89%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 15 km/h . Mar: 15 km/h . Apr: 15 km/h . May: 14 km/h . Jun: 14 km/h . Jul: 14 km/h . Aug: 13 km/h . Sep: 13 km/h . Oct: 14 km/h . Nov: 15 km/h . Dec: 15 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 7h. Apr: 9h. May: 11h. Jun: 12h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 7h. Nov: 5h. Dec: 4h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 2. Mar: UV 4. Apr: UV 6. May: UV 7. Jun: UV 7. Jul: UV 8. Aug: UV 7. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 1 days. Feb: 3 days. Mar: 1 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 19 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 31°C | Aug · 31°C |
| Coldest month | Jan 2025 · 1°C | Feb · 2°C |
| Wettest month | Dec 2025 · 210 mm | Dec · 177 mm |
| Windiest month | Dec 2025 · 18 km/h | Dec · 15 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 3°C | 7°C / -1°C | 17days (162 mm) Wet | 4.5h Fair | 86% Very Muggy | 1.7 Low | Poor | View Details |
| February | 10°C / 2°C | 7°C / -1°C | 16days (128 mm) Wet | 5.6h Fair | 85% Humid | 2.4 Moderate | Poor | View Details |
| March | 13°C / 3°C | 10°C / 0°C | 17days (127 mm) Wet | 7.4h Good | 83% Humid | 3.8 Moderate | Poor | View Details |
| April | 16°C / 6°C | 14°C / 3°C | 14days (97 mm) Wet | 9.1h Good | 77% Humid | 5.5 High | Fair | View Details |
| May | 21°C / 9°C | 20°C / 7°C | 8days (48 mm) Wet | 10.8h Excellent | 71% Muggy | 6.5 High | Good | View Details |
| June best | 25°C / 12°C | 24°C / 11°C | 5days (31 mm) Good | 12.2h Excellent | 63% Muggy | 7 High | Excellent | View Details |
| July best | 30°C / 14°C | 29°C / 14°C | 1days (4 mm) Excellent | 13.2h Excellent | 54% Moderate | 7.5 Very High | Excellent | View Details |
| August best | 31°C / 15°C | 30°C / 15°C | 1days (5 mm) Excellent | 12h Excellent | 54% Moderate | 6.6 High | Excellent | View Details |
| September best | 26°C / 13°C | 25°C / 12°C | 6days (37 mm) Good | 10h Excellent | 65% Muggy | 5.1 High | Excellent | View Details |
| October | 18°C / 8°C | 17°C / 7°C | 11days (96 mm) Wet | 7.4h Good | 77% Humid | 3.4 Moderate | Good | View Details |
| November | 12°C / 5°C | 10°C / 3°C | 15days (145 mm) Wet | 5.3h Fair | 86% Very Muggy | 2.1 Moderate | Poor | View Details |
| December | 9°C / 3°C | 6°C / 0°C | 17days (177 mm) Wet | 4.2h Fair | 89% Very Muggy | 1.3 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Keizer are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Keizer, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Keizer is August, with average daytime highs of 31°C (87°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Keizer is February, with average overnight lows of 2°C (36°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Keizer is December, averaging 177mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Keizer runs through January, March, December, February, with the heaviest rainfall in January. Based on 10-year averages for Keizer.
Keizer receives approximately 102 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Keizer.
The least favorable months to visit Keizer are January, February, November, December, primarily due to heavy rainfall. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Keizer is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Keizer is 74%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Keizer receives snow. Months with snowfall average 2 snow days and 2 cm (1 in) of accumulation, with about 6 frost days during winter.
Average wind speeds in Keizer are 14 km/h (9 mph). The windiest month is December with peak winds reaching 15 km/h (9 mph) (gusts up to 35 km/h / 21 mph).
Keizer averages 6 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in July.
The annual average dew point in Keizer is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Keizer has a Hot-Summer Mediterranean climate, classified as Csa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Keizer ranges from 6°C (43°F) to 17°C (63°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Keizer. It earns a climate score of 8.7/10 with Excellent.
For June in Keizer, pack Warm evening layer, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 25°C (77°F) and 5 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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