Photo: SkatePark in Main City Park, Gresham, Oregon.jpg · CC BY 4.0 · Wikimedia Commons
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Climate guideThirty-year normals for Gresham, Oregon
Gresham climate by month
Warm-summer Mediterranean · CsbBest Jul–Sep
Annual mean53°day and night
Seasonal swing28°warmest vs coolest
Precipitation60.2 in161 wet days a year
45.50° N, 122.43° WElevation 318 ftUTC−7 · Pacific Daylight Time
When to goGresham · weather score
Best timeJul–Sep
October: high / low63° / 45°
iSummary
What the weather is like
Gresham has a warm-summer Mediterranean climate (Köppen Csb): dry, sunny summers and mild, wetter winters.
The warmest month is August, when afternoons average 81° and nights 55°. December is the coolest month, with highs of 46° and lows of 35°. The difference between the warmest and the coolest month is about 28°.
About 60.2 in of precipitation falls in an average year. December is the wettest month (9.0 in, 20 wet days) and July the driest (0.9 in, 3 wet days). Cloud cover ranges from 21% in August to 55% in January.
Compared with Washington, the capital, Gresham is 3.4° cooler on a August afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 81° · August
- Coldest nights
- 35° · January
- Wettest month
- December
- Driest month
- July
- Clearest skies
- August · 21% cloud
- Longest day
- 15 h 40 min
- Shortest day
- 8 h 44 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 46° | 50° | 56° | 61° | 68° | 73° | 81° | 81° | 75° | 63° | 52° | 46° |
| Average low | 35° | 36° | 38° | 41° | 47° | 51° | 55° | 55° | 51° | 45° | 39° | 35° |
| Precipitation | 8.0 in | 6.1 in | 6.3 in | 5.0 in | 4.1 in | 3.1 in | 0.9 in | 0.9 in | 2.4 in | 5.2 in | 9.0 in | 9.0 in |
| Wet days (≥1 mm) | 19.1 | 16.1 | 19.3 | 17.1 | 13.4 | 9.9 | 2.6 | 3.1 | 7 | 14.4 | 18.8 | 19.9 |
| Cloud cover | 55% | 50% | 50% | 47% | 44% | 37% | 23% | 21% | 25% | 38% | 53% | 54% |
| Daylight | 9h 06 | 10h 25 | 11h 53 | 13h 31 | 14h 54 | 15h 40 | 15h 20 | 14h 08 | 12h 34 | 10h 59 | 9h 31 | 8h 44 |
| Month score | 15 | 18 | 33 | 49 | 63 | 74 | 85 | 83 | 84 | 61 | 22 | 15 |
ivMonth by month
Gresham in every month
January15
46° / 35°
8.0 in · 19.1 wet days
February18
50° / 36°
6.1 in · 16.1 wet days
March33
56° / 38°
6.3 in · 19.3 wet days
April49
61° / 41°
5.0 in · 17.1 wet days
May63
68° / 47°
4.1 in · 13.4 wet days
June74
73° / 51°
3.1 in · 9.9 wet days
July85
81° / 55°
0.9 in · 2.6 wet days
August83
81° / 55°
0.9 in · 3.1 wet days
September84
75° / 51°
2.4 in · 7 wet days
October61
63° / 45°
5.2 in · 14.4 wet days
November22
52° / 39°
9.0 in · 18.8 wet days
December15
46° / 35°
9.0 in · 19.9 wet days