Johnston, Rhode Island Climate by Month
Johnston, Rhode Island, United States
Warm summers and cold winters, with rain spread through the year.
The climate in Johnston is one of warm summers and cold winters, with rain spread through the year. Expect highs of 82°F (28°C) in July and 37°F (3°C) in January, with the coldest nights (January) near 19°F (-7°C). It gets 49 in (1244 mm) of rain a year, spread across the months.
- Warmest month
- 82°F(28°C)
- Average high, July
- Coldest nights
- 19°F(-7°C)
- Average low, January
- Rain per year
- 49 in(1244 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Johnston
Best for weatherThe most comfortable weather comes in June and September, with highs around 76°F (24°C) and about 4.0 in (101 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 37°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Johnston weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 19°F(-7°C) | 3.8 in(96 mm) | 77% | 1.7 |
| FebFebruary | 38°F(4°C) | 20°F(-7°C) | 3.5 in(88 mm) | 74% | 2.6 |
| MarMarch | 47°F(8°C) | 27°F(-3°C) | 4.8 in(123 mm) | 67% | 3.5 |
| AprApril | 57°F(14°C) | 37°F(3°C) | 4.3 in(108 mm) | 64% | 4.6 |
| MayMay | 68°F(20°C) | 46°F(8°C) | 3.2 in(82 mm) | 63% | 5.2 |
| JunJuneBest | 76°F(25°C) | 55°F(13°C) | 4.1 in(104 mm) | 74% | 5.6 |
| JulJuly | 82°F(28°C) | 62°F(17°C) | 3.7 in(94 mm) | 75% | 5.8 |
| AugAugust | 81°F(27°C) | 62°F(16°C) | 4.1 in(105 mm) | 73% | 5.2 |
| SepSeptemberBest | 75°F(24°C) | 54°F(12°C) | 3.8 in(97 mm) | 77% | 4.0 |
| OctOctober | 64°F(18°C) | 42°F(6°C) | 4.6 in(118 mm) | 73% | 2.7 |
| NovNovember | 53°F(12°C) | 34°F(1°C) | 4.3 in(110 mm) | 73% | 1.8 |
| DecDecember | 43°F(6°C) | 25°F(-4°C) | 4.7 in(119 mm) | 75% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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