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Gresham Weather by Month
Average temperatures, rainfall and humidity for Gresham, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Gresham month looks like before you travel — then check the live Gresham forecast for the days ahead.
Warmest month
August
29°C average high
Coolest month
January
3°C average low
Wettest month
December
153 mm of rain
Driest month
July
10 mm of rain
Average temperature and rainfall in Gresham by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 8°C | 3°C | -11°C / 16°C | 115 mm | 82% | 16 km/h |
| February | 9°C | 3°C | -8°C / 19°C | 101 mm | 81% | 13 km/h |
| March | 13°C | 4°C | -5°C / 27°C | 105 mm | 76% | 11 km/h |
| April | 17°C | 6°C | -1°C / 30°C | 84 mm | 70% | 10 km/h |
| May | 21°C | 9°C | 2°C / 33°C | 59 mm | 68% | 8 km/h |
| June | 25°C | 12°C | 4°C / 45°C | 46 mm | 65% | 8 km/h |
| July | 29°C | 14°C | 8°C / 39°C | 10 mm | 61% | 8 km/h |
| August | 29°C | 15°C | 8°C / 41°C | 14 mm | 63% | 7 km/h |
| September | 25°C | 12°C | 5°C / 37°C | 65 mm | 70% | 8 km/h |
| October | 18°C | 8°C | -2°C / 30°C | 103 mm | 78% | 9 km/h |
| November | 11°C | 5°C | -7°C / 21°C | 121 mm | 82% | 12 km/h |
| December | 8°C | 3°C | -12°C / 17°C | 153 mm | 84% | 15 km/h |
Best time to visit Gresham
The most comfortable time to visit Gresham is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around December, totalling about 977 mm a year.
Travellers who prefer heat should aim for August, when highs average 29°C. December is the month to avoid if rain would spoil your plans — it averages 153 mm, roughly 15× the rainfall of the driest month (July).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Gresham forecast for what is happening now.