Best Time to See Monarch Butterflies in Rhode Island
August, September and July is the best time to see monarch butterflies in Rhode Island. Based on 772 verified iNaturalist observations, here is exactly when monarch butterflies are most active across the year in Rhode Island.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
772 verified observations of monarch butterflies in Rhode Island, recorded across 7 months of the year on iNaturalist.
When monarch butterflies are recorded in Rhode Island
Peak month
August
242 records (31.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 4 | 0.5% |
| June | 41 | 5.3% |
| Julypeak | 183 | 23.7% |
| Augustpeak | 242 | 31.3% |
| Septemberpeak | 199 | 25.8% |
| October | 90 | 11.7% |
| November | 13 | 1.7% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 772 |
Weather to expect, source Open-Meteo
Typical weather in Rhode Island
Recent typical conditions by month, so you can plan a trip around both when monarch butterflies are active and what the weather is doing. The best months to look for monarch butterflies sit around 59 to 83 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 39°F | 25°F | 4.3" |
| Feb | 41°F | 25°F | 4" |
| Mar | 49°F | 31°F | 4" |
| Apr | 57°F | 40°F | 5.2" |
| May | 67°F | 49°F | 4" |
| Jun | 77°F | 59°F | 3.7" |
| Julbest time | 83°F | 67°F | 4.9" |
| Augbest time | 81°F | 66°F | 3.7" |
| Sepbest time | 74°F | 59°F | 5" |
| Oct | 64°F | 50°F | 5.9" |
| Nov | 52°F | 37°F | 3.6" |
| Dec | 44°F | 30°F | 6.5" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Rhode Island. Weather varies year to year, so treat these as a guide.
More on monarch butterflies in Rhode Island:
Sightings of monarch butterflies in Rhode Island peak in August, when 242 of the year's 772 verified observations are logged — about 31.3% of the annual total. Activity stays high through August, September and July.
The quietest stretch is January, February and March, when monarch butterflies are hardest to find — no verified records exist for January. If a reliable sighting matters, plan around the peak window rather than the off-season.
The monarch butterflies you are most likely to encounter in Rhode Island are Monarch — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see monarch butterflies in Rhode Island
- Blackstone River Valley National Historical Park — National Historical Park
- Roger Williams National Memorial — National Memorial
- Touro Synagogue National Historic Site — National Historic Site
- Washington-Rochambeau Revolutionary Route National Historic Trail — National Historic Trail
Frequently asked questions
What is the best month to see monarch butterflies in Rhode Island?+
August is the single best month, and the broader peak window runs through August, September and July, based on 772 verified iNaturalist observations.
When are monarch butterflies hardest to see in Rhode Island?+
January is the quietest month for monarch butterflies in Rhode Island, with no verified records on iNaturalist.
Are monarch butterflies active year-round in Rhode Island?+
Monarch butterflies are recorded in 7 of 12 months in Rhode Island, concentrated around August and September.
More places to see monarch butterflies
More wildlife in Rhode Island