Lopez Island Weather in September
September in Lopez Island brings pleasant temperatures, with daytime highs of 20°C (68°F) and nights around 9°C (48°F). The perfect weather makes it a solid choice for a visit.
Rainfall in Lopez Island in September
Past climate data indicates that roughly 11 days will see rain, totalling around 38 mm (1.5 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Lopez Island in September
September in Lopez Island is generally perfect, with days reaching 20°C (68°F) and nights settling around 9°C (48°F). September marks the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows around 9°C (48°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Lopez Island in September
Expect sunny days throughout the month, with an estimated 202 hours of sunshine. This makes it a pleasant time to visit Lopez Island.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Lopez Island.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Lopez Island's climate page.
Lopez Island Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
20°C (68°F)
Chance of Rain
36%
Precipitation
38 mm (1.5 in)
Rainy days
11 days
Sunshine
202 hours *
Percentage Sunshine
55% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Lopez Island typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Lopez Island in September
Browse day-by-day weather records for Lopez Island spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Lopez Island historical weather extremes in September
According to our 49 years of weather records for Lopez Island, the following extremes were recorded between 1976 and 2025.
- The warmest day in September was on September 3, 2017, with a maximum of 30°C (86°F).
- The coldest September day was on September 30, 2013, with a maximum of 12°C (54°F).
- Lopez Island registered its coldest September night on September 24, 1984, with temperatures dropping to -4°C (25°F).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Lopez Island in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Pack a light rain jacket or compact umbrella for occasional showers. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Lopez Island in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Lopez Island's climate page.
See the full Lopez Island climate overview or explore weather in the United States of America.
