Gresham, United States experiences average highs of 17°C (63°F) and lows of 7°C (45°F) throughout the year. Rainfall is frequent, averaging about 13 rainy days per month. Average highs have warmed by 0.7°C (1.3°F) across the available records.
Gresham, United States Weather & Climate 2026
Monthly climate averages for Gresham, 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
5.4/10
Best: June, July, August, September
UV Index
4
Low
Temperature 17°C / 7°C
Feels Like 16°C / 5°C
Rainy Days 13
Rainfall 132 mm
Sunshine 8 h
Humidity 76%
Wind Speed 13 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 7 days
Hottest Month
29°C
August
Avg Low15°C
Rain2days
Coldest Month
1°C
February
Avg High8°C
Rain18days
Driest Month
2days
July
Avg High28°C
Avg Low14°C
Windiest Month
15 km/h
December (Gusts 38)
Worst Time to Visit
Consider avoiding January, February, March, December due to heavy rainfall.
Sun Position
Sunrise 05:22
Daylight 15.7h
Sunset 21:01
Live conditions—
Gresham on the map · live conditions
Gresham, United States
- Continent
- Americas
- Country
- United States
- City
- Gresham
- Population
- 110.6K
- Elevation
- 97 m
- Coordinates
- 45.50°, -122.43°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 5°C
Rain 16 days/mo
Summer
Jun–Aug
Avg High 27°C
Avg Low 14°C
Rain 4 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 8°C
Rain 13 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low 2°C
Rain 19 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: 8°C / 2°C . Feb: 8°C / 1°C . Mar: 12°C / 3°C . Apr: 16°C / 5°C . May: 20°C / 9°C . Jun: 24°C / 12°C . Jul: 28°C / 14°C . Aug: 29°C / 15°C . Sep: 25°C / 12°C . Oct: 17°C / 8°C . Nov: 11°C / 5°C . Dec: 8°C / 2°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 224 mm. Feb: 193 mm. Mar: 174 mm. Apr: 138 mm. May: 75 mm. Jun: 61 mm. Jul: 6 mm. Aug: 11 mm. Sep: 58 mm. Oct: 163 mm. Nov: 218 mm. Dec: 258 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 86%. Feb: 85%. Mar: 83%. Apr: 77%. May: 73%. Jun: 69%. Jul: 60%. Aug: 59%. Sep: 68%. Oct: 79%. Nov: 86%. Dec: 88%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 14 km/h . Mar: 14 km/h . Apr: 13 km/h . May: 12 km/h . Jun: 12 km/h . Jul: 11 km/h . Aug: 11 km/h . Sep: 11 km/h . Oct: 13 km/h . Nov: 14 km/h . Dec: 15 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. 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 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. 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: 5 days. Feb: 8 days. Mar: 5 days. Apr: 2 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 5 days.
Climate Trends
Average highs have warmed by 0.7°C (1.3°F) across the available records. Average rainfall is trending drier by about 17 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 29°C | Aug · 29°C |
| Coldest month | Jan 2025 · 0°C | Feb · 1°C |
| Wettest month | Dec 2025 · 390 mm | Dec · 258 mm |
| Windiest month | Dec 2025 · 17 km/h | Dec · 15 km/h |
Month-by-Month Weather Table
January
Wet 
February
Wet March
Wet April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Wet December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 2°C | 5°C / -2°C | 19days (224 mm) Wet | 4.4h Fair | 86% Very Muggy | 1.6 Low | Wet | View Details |
| February | 8°C / 1°C | 6°C / -2°C | 18days (193 mm) Wet | 5.5h Fair | 85% Humid | 2.3 Moderate | Wet | View Details |
| March | 12°C / 3°C | 9°C / -1°C | 20days (174 mm) Wet | 7.4h Good | 83% Humid | 3.7 Moderate | Wet | View Details |
| April | 16°C / 5°C | 14°C / 2°C | 16days (138 mm) Wet | 9.1h Good | 77% Humid | 5.4 High | Fair | View Details |
| May | 20°C / 9°C | 19°C / 7°C | 11days (75 mm) Wet | 10.8h Excellent | 73% Muggy | 6.1 High | Good | View Details |
| June best | 24°C / 12°C | 23°C / 11°C | 9days (61 mm) Wet | 12.1h Excellent | 69% Muggy | 6.7 High | Excellent | View Details |
| July best | 28°C / 14°C | 28°C / 14°C | 2days (6 mm) Excellent | 13.2h Excellent | 60% Moderate | 7.3 Very High | Excellent | View Details |
| August best | 29°C / 15°C | 29°C / 15°C | 2days (11 mm) Excellent | 11.9h Excellent | 59% Moderate | 6.4 High | Excellent | View Details |
| September best | 25°C / 12°C | 24°C / 12°C | 8days (58 mm) Wet | 9.9h Good | 68% Muggy | 5 Moderate | Excellent | View Details |
| October | 17°C / 8°C | 16°C / 6°C | 14days (163 mm) Wet | 7.2h Good | 79% Humid | 3.2 Moderate | Good | View Details |
| November | 11°C / 5°C | 9°C / 2°C | 18days (218 mm) Wet | 5.2h Fair | 86% Very Muggy | 1.9 Low | Wet | View Details |
| December | 8°C / 2°C | 5°C / -1°C | 20days (258 mm) Wet | 4h Fair | 88% Very Muggy | 1.2 Low | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Gresham are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Gresham, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Gresham is August, with average daytime highs of 29°C (85°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Gresham is February, with average overnight lows of 1°C (34°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Gresham is December, averaging 258mm of precipitation across 20 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Gresham runs through March, December, January, February, with the heaviest rainfall in March. Based on 10-year averages for Gresham.
Gresham receives approximately 101 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Gresham.
The least favorable months to visit Gresham are January, February, March, December, primarily due to heavy rainfall. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Gresham is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Gresham is 76%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Gresham receives snow. Months with snowfall average 4 snow days and 7 cm (3 in) of accumulation, with about 7 frost days during winter.
Average wind speeds in Gresham are 13 km/h (8 mph). The windiest month is December with peak winds reaching 15 km/h (9 mph) (gusts up to 38 km/h / 24 mph).
Gresham averages 5 clear-sky days per month with overall cloud cover around 61%. The clearest skies occur in July.
The annual average dew point in Gresham is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Gresham 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 Gresham ranges from 5°C (41°F) to 16°C (61°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 Gresham. It earns a climate score of 8.3/10 with Excellent.
For June in Gresham, pack Warm evening layer, Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 24°C (74°F) and 9 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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