Climate Insights for Stillwater

The climate in Stillwater is temperate. The average annual temperature is 17°C and approximately 974mm of precipitation falls per year. Stillwater receives a notable amount of rainfall throughout the year, including during its driest month. Stillwater is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -1°C. Light snow can occur between January and December.

Temperatures in Stillwater vary considerably across the year, with a 35°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 34°C and the mean temperature sits around 28°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 3°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Stillwater is a moderately rainy area, receiving approximately 974mm of precipitation annually, which averages out to around 81mm per month. The wettest month is May, averaging 151mm of rainfall. April and June also tend to see above-average precipitation. The driest month is December, with just 36mm. That's 116mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 16cm annually. February is the snowiest month with approximately 6cm.

Stillwater is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently summer in Stillwater, which began on June 21, 2026. Stillwater is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 34°C, while the coldest stretch bottoms out in January near -1°C. Autumn is next, beginning on September 23, 2026 (8 days from now).

The best time to visit Stillwater is during September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 82mm per month. By contrast, July can be uncomfortably hot with highs reaching 34°C, while January is the coldest period with lows dropping to -1°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Stillwater based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.